Herb & supplement monograph

Casein Protein Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated July 2026
What is this page for?

First and foremost: how Casein Protein interacts with medications. The heart of this page is the interaction list — every drug Casein Protein is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Casein Protein is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

Check Casein Protein against your medication

Add one medication
Casein Protein
+
Start typing any prescription or over-the-counter drug name.
Reviewed by licensed pharmacists Sourced from Natural Medicines
On this page
Interaction report

Drugs that interact with Casein Protein

0 medications have a known interaction with Casein Protein, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Casein Protein. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Casein Protein combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Monograph

Casein Protein: Uses, Safety & Side Effects

Medically reviewed by · Reviewed July 2026 ·
The bottom line

Casein is a slow-digesting protein from milk that supplies all the essential amino acids and is popular for muscle recovery, especially overnight. It is generally safe for most people who tolerate dairy, but those with a milk allergy should avoid it. As with any supplement, check with your pharmacist or doctor, especially if you have kidney problems.

Part used
Milk-derived protein (from cow's milk)
Common forms
Powders, ready-to-drink shakes, protein bars; also as micellar casein or calcium caseinate
People commonly use it for
  • Muscle building and recovery
  • Slow-release protein before sleep
  • Meal replacement and weight management
  • Increasing daily protein intake
  • Supporting athletic training

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallLikely safe

Generally safe for healthy people who tolerate dairy when used as a food/protein source.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those found in foods.

Read the full pregnancy detail
BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those found in foods.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Casein protein is one of the two main proteins found in cow's milk, the other being whey. Casein makes up about 80% of milk's protein, while whey makes up the rest. It is separated from milk during processing and sold as a dietary supplement, often as a powder.

People most often use casein to add protein to their diet, support muscle growth and recovery, and as a slow-digesting protein source. Common forms include micellar casein and calcium caseinate. It is also found naturally in dairy foods like milk, cheese, and yogurt.

Casein is often called a "slow" protein because it forms a gel in the stomach and is digested gradually over several hours. This is why many people take it at night before sleep.

How it works

Casein is a complete protein, meaning it contains all nine essential amino acids your body cannot make on its own. These amino acids, especially leucine, help signal your muscles to build and repair tissue.

What makes casein unique is how it digests. In the acidic stomach, casein clumps together and forms a gel. This slows down digestion, so amino acids are released into your blood slowly over many hours. In contrast, whey protein is absorbed quickly.

This slow, steady release is the main reason casein is popular for nighttime use or between meals, when you want a longer supply of amino acids. Most of this understanding comes from nutrition and exercise research in people.

Effectiveness

Does Casein Protein work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 13 uses evaluated
1 Leans ineffective 12 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.
Possibly Ineffective Infant development
Rating & evidence shown verbatim from Natural Medicines

Most clinical research shows that using casein protein-predominant formula for 6 weeks to 6 months in premature, low-birth weight, or healthy infants does not affect growth when compared with breast milk, whey protein-based formula, rice hydrolysate formula, cow's milk formula, or amino acid-based formula. However, other clinical research in healthy, moderately premature, or very low birth weight infants shows that whey protein-based formula is superior to casein protein-based formula for increasing growth.

Sources Ref 91645 Ref 91668 Ref 91669 Ref 91670 Ref 91666 Ref 91667 Ref 91671
Also studied for 12 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Alcohol-related liver disease
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in adults with alcohol-related liver disease shows that a specific casein protein-based supplement (Isocal HCN, Mead Johnson), dosed as 1.5 grams/kg of ideal body weight daily, administered via enteral feeding tube for 28 days, improves encephalopathy scores by over 50% when compared with baseline. Taking the casein protein-based formula also improved total caloric intake and plasma markers of liver disease when compared with control. Additional clinical research in adults with alcohol-related liver disease shows that taking a specific casein-based enteral formula (ADN, Laboratorios Davis) providing 34 grams of protein daily for one year reduces hospitalization rate by approximately 50% and reduces the risk for infection when compared with control. However, there was no effect on mortality or progression of liver failure.

Sources Ref 91266 Ref 91268
Insufficient Reliable Evidence To Rate Athletic performance
Rating & evidence shown verbatim from Natural Medicines

The clinical evidence for the benefits of casein protein on athletic performance is conflicting. Some preliminary clinical research shows that taking casein protein alone or in combination with whey protein and other sports supplements for 4-12 weeks, in conjunction with resistance training, does not improve strength or body composition when compared with placebo in obese women or young men. However, other preliminary clinical research shows that taking casein protein, with or without whey protein, improves strength and athletic performance in a variety of individuals, including collegiate female basketball players, obese sedentary women, and professional male soccer players.

Sources Ref 91252 Ref 91254 Ref 91280 Ref 111440 Ref 85821 Ref 91253 Ref 91641
Insufficient Reliable Evidence To Rate Chronic obstructive pulmonary disease (COPD)
Rating & evidence shown verbatim from Natural Medicines

Muscle wasting is a common complication in patients with COPD. Preliminary clinical research in adults with COPD shows that taking casein protein 29.5 grams two hours prior to exercise increases protein synthesis when compared with whey protein. Despite these findings, clinical research in adults with COPD shows that taking casein protein 20 grams daily for 8 weeks does not improve lung or muscle function when compared with baseline or whey protein. Furthermore, taking casein protein in conjunction with exercise training for 8 weeks is less effective than whey protein for improving endurance and fatigue in patients with COPD.

Sources Ref 91263 Ref 86025
Insufficient Reliable Evidence To Rate Diabetes
Rating & evidence shown verbatim from Natural Medicines

A clinical study in men with diabetes shows that drinking a beverage containing carbohydrates and casein protein 0.3 g/kg as a single dose increases plasma insulin levels and tends to lower levels of plasma glucose when compared with placebo. However, there was no difference between beverages containing intact casein protein or casein peptides. Furthermore, a small clinical study in patients with diabetes shows that taking sodium caseinate (Saneigien) 15 grams by mouth as a single dose does not lower postprandial blood glucose, but seems to increase postprandial insulin levels by 36% and glucagon levels by about 14%, when compared with placebo.

Sources Ref 91276 Ref 91299
Insufficient Reliable Evidence To Rate Diarrhea
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in infants with prolonged dehydrating gastroenteritis shows that consuming formula containing casein protein, soy protein, or whey protein as 160 mL/kg daily reduces stool weight when compared with cow's milk formula.

Sources Ref 91646
Insufficient Reliable Evidence To Rate Exercise-induced muscle soreness
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in cyclists shows that drinking 1000 mL of a supplement containing 5% casein protein and 2% carbohydrates does not improve time trial performance when compared with supplements containing either 2% carbohydrates and 5% whey protein, or 7% carbohydrates and no protein. Additionally, preliminary clinical research in athletes performing intensive resistance training shows that taking a specific protein supplement (New Whey Liquid Protein, IDS Sports), containing casein protein, whey protein, collagen protein, and branched chain amino acids, 42 grams before and after exercise, does not reduce muscle soreness when compared with placebo.

Sources Ref 86303 Ref 85945
Insufficient Reliable Evidence To Rate Gastroesophageal reflux disease (GERD)
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in neurologically impaired children with GERD shows that taking a specific casein protein formula (Osmolite, Ross Laboratories) is less effective than taking a specific whey protein formula (Peptamen, Clintec Nutrition) for reducing GERD episode frequency and duration. However, in infants with GERD, the effects of casein protein and whey protein appear to be similar.

Sources Ref 86231
Insufficient Reliable Evidence To Rate Hepatic encephalopathy
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in adults with chronic hepatic encephalopathy shows that taking casein protein daily for 3 months is less effective than branched-chain amino acid therapy for improving symptoms of encephalopathy. Replacement of casein protein with branched-chain amino acid therapy after these 3 months led to improvements in encephalopathy symptoms.

Sources Ref 690
Insufficient Reliable Evidence To Rate Hepatitis C
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research in adults with chronic hepatitis C infection shows that taking casein protein 32 grams daily for 12 weeks improves health-related quality of life when compared with baseline. This improvement is similar to consuming soy protein 32 grams daily.

Sources Ref 91270
Insufficient Reliable Evidence To Rate Hyperlipidemia
Rating & evidence shown verbatim from Natural Medicines

Clinical research assessing the effects of casein protein on blood lipids is conflicting. Casein protein is commonly used as a control treatment in clinical trials assessing other protein sources, including soy, barley, whey, and lupin. The majority of these studies show that casein protein has no effect on lipid levels in healthy and hyperlipidemic adults. However, some small preliminary clinical studies show that taking casein protein 35-40 grams daily for 6-12 weeks improves total cholesterol, low-density lipoprotein (LDL) cholesterol, and high density lipoprotein (HDL) cholesterol when compared with baseline in healthy and hyperlipidemic patients. Also, casein protein seems to improve lipoprotein(a) levels, with some clinical studies showing lipoprotein(a) reductions of more than 50% with casein protein when compared with soy protein.

Sources Ref 842 Ref 2294 Ref 6412 Ref 8530 Ref 8963 Ref 75149 Ref 75219 Ref 75242 Ref 75276 Ref 75580 Ref 91274 Ref 75240 Ref 75512 Ref 75540 Ref 75545 Ref 75615 Ref 86011 Ref 91273 Ref 91279 Ref 91281
Insufficient Reliable Evidence To Rate Hypertension
Rating & evidence shown verbatim from Natural Medicines

The effects of casein protein on blood pressure are unclear. Clinical research in overweight and obese adults shows that taking casein protein 54 grams daily for 12 weeks reduces diastolic blood pressure, but not systolic blood pressure, by 3% when compared with a control diet. Preliminary clinical research in obese, sedentary women shows that taking casein protein 30 grams daily, in conjunction with moderate intensity exercise for 4 weeks, reduces systolic blood pressure, but not diastolic blood pressure, by 7 mmHg compared with a control diet and moderate intensity exercise.

Sources Ref 85981 Ref 91280
Insufficient Reliable Evidence To Rate Obesity
Rating & evidence shown verbatim from Natural Medicines

Most clinical research shows that supplementation with casein protein does not reduce body weight or appetite when compared to control in overweight and obese patients. However, some clinical research in overweight patients shows that consumption of a liquid snack containing 30 grams of casein or whey protein extends the duration of satiety compared with a carbohydrate snack. Additionally, some research in obese patients shows that taking casein protein or whey protein 25 grams twice daily for 12 weeks improves weight maintenance after weight loss when compared with control. Also, while some research suggests that whey protein is superior to casein protein for appetite suppression, most clinical research shows that casein protein, whey protein, and soy protein have similar effects on weight loss and satiety.

Sources Ref 86011 Ref 86105 Ref 91286 Ref 91284 Ref 85932 Ref 91272 Ref 91294

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

For most healthy people who tolerate dairy, casein protein is safe when used as directed. Because it is simply a milk protein, it has a long history of being part of the human diet.

Who should be cautious or avoid it:

  • People with a milk or dairy allergy should avoid casein, as it can trigger serious allergic reactions.
  • People who are lactose intolerant may tolerate casein powders better than milk, but some products still contain small amounts of lactose.
  • People with kidney disease should talk to their doctor, since high protein intake can stress the kidneys.
  • Those following a vegan or dairy-free diet will want a plant protein instead.

During pregnancy and breastfeeding, eating casein as part of normal dairy foods is fine. However, concentrated protein supplements have not been well studied in these groups, so check with your doctor before using powders.

Side effects

Casein is usually well tolerated. The most common side effects are digestive, especially in people sensitive to dairy:

  • Bloating, gas, or stomach upset
  • Cramping or diarrhea, often related to lactose in some products
  • Feeling overly full

Rarely, people with a true milk allergy can have a serious allergic reaction, including hives, swelling, or trouble breathing. If this happens, seek emergency care right away. Taking very large amounts of protein over time may also be hard on the kidneys in people who already have kidney problems.

Casein Protein: Reported Adverse Effects

Documented safety reports on Casein Protein from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Orally, casein protein is well tolerated in adults and seems to be well tolerated in infants. Side effects reported in clinical trials did not occur more commonly than placebo. Some of these reported side effects include diarrhea, constipation, vomiting, and delayed gastric emptying. In preterm infants, casein protein has been associated with an increased risk for metabolic acidosis. Rarely, casein protein has been reported to cause allergic reaction.

  1. Claessens, M., van Baak, M. A., Monsheimer, S., and Saris, W. H. The effect of a low-fat, high-protein or high-carbohydrate ad libitum diet on weight loss maintenance and metabolic risk factors. Int J Obes.(Lond) 2009;33(3):296-304.
  2. Tarnopolsky MA, Parise G, Yardley NJ, et al. Creatine-dextrose and protein-dextrose induce similar strength gains during training. Med Sci Sports Exerc 2001;33(12):2044-52.
  3. Kearns PJ, Young H, Garcia G, et al. Accelerated improvement of alcoholic liver disease with enteral nutrition. Gastroenterology 1992;102(1):200-5.
  4. Pal S, Radavelli-Bagatini S, Hagger M, Ellis V. Comparative effects of whey and casein proteins on satiety in overweight and obese individuals: a randomized controlled trail. Eur J Clin Nutr 2014;68(9):980-6.
  5. Anderson JW, Fuller J, Patterson K, et al. Soy compared to casein meal replacement shakes with energy-restricted diets for obese women: randomized controlled trial. Metabolism 2007;56(2):280-8.
  6. Geerts BF, van Dongen MG, Flameling B, et al. Hydrolyzed casein decreases posprandial glucose concentrations in T2DM patients irrespective of leucine content. J Diet Suppl 2011;8(3):280-92.
  7. Lollo PC, Amaya-Farfan J, de Carvalho-Silva LB. Physiological and physical effects of different milk protein supplements in elite soccer players. J Hum Kinet 2011;30:49-57.
  8. Rajah R, Pettifor JM, Noormohamed M, et al. The effect of feeding four different formulae on stool weights in prolonged dehydrating infantile gastroenteritis. J Pediatr Gastroenterol Nutr 1988;7(2):203-7.
  9. Gunn TR, Stunzer D. A comparative trial of casein or whey-predominant formulae in healthy infants. N Z Med J 1986;99(813):843-6.
  10. Viall C, Porcelli K, Teran JC, et al. A double-blind clinical trial comparing the gastrointestinal side effects of two enteral feeding formulas. JPEN J Parenter Enteral Nutr 1990;14(3):265-9.
  11. Fok TF, So LY, Lee NN, et al. Late metabolic acidosis and poor weight gain in moderately pre-term babies fed with a casein-predominant formula: a continuing need for caution. Ann Trop Paediatr 1989;9(4):243-7.
  12. Lam HY, van Hoffen E, Michelsen A, et al. Cow's milk allergy in adults is rare but severe: Both casein and whey proteins are involved. Clin Exp Allergy 2008;38(6):995-1002.
Reports by condition
Allergic rhinitis (hay fever) Immunologic

Rarely, allergic reaction to casein protein has been reported. Symptoms include skin reactions, difficulty breathing, gastrointestinal distress, and anaphylaxis. At one time, casein protein was thought to be the major allergenic and antigenic protein in cow's milk. However, it is now known that no specific protein or peptide in cow's milk is primarily responsible for cow's milk allergy; casein protein is used as a common alternative to cow's milk formula.

  1. Lam HY, van Hoffen E, Michelsen A, et al. Cow's milk allergy in adults is rare but severe: Both casein and whey proteins are involved. Clin Exp Allergy 2008;38(6):995-1002.
  2. Docena GH, Fernandez R, Chirdo FG, Fossati CA. Identification of casein as the major allergenic and antigenic protein of cow's milk. Allergy 1996;51(6):412-6.
  3. Wal JM. Bovine milk allergenicity. Ann Allergy Asthma Immunol 2004;93(5 Suppl 3):S2-11.
Constipation Gastrointestinal

Orally, casein protein-based enteral nutrition has been reported to cause diarrhea and vomiting in adults. Casein protein-predominant formula has been reported to cause constipation in infants. Casein protein-based formula can delay gastric emptying when compared with whey protein-based formula.

  1. Viall C, Porcelli K, Teran JC, et al. A double-blind clinical trial comparing the gastrointestinal side effects of two enteral feeding formulas. JPEN J Parenter Enteral Nutr 1990;14(3):265-9.
  2. Gunn TR, Stunzer D. A comparative trial of casein or whey-predominant formulae in healthy infants. N Z Med J 1986;99(813):843-6.
  3. Brun, A. C., Stordal, K., Johannesdottir, G. B., Bentsen, B. S., and Medhus, A. W. The effect of protein composition in liquid meals on gastric emptying rate in children with cerebral palsy. Clin.Nutr 2012;31(1):108-112.
  4. Savage, K., Kritas, S., Schwarzer, A., Davidson, G., and Omari, T. Whey- vs casein-based enteral formula and gastrointestinal function in children with cerebral palsy. JPEN J Parenter.Enteral Nutr 2012;36(1 Suppl):118S-123S.
Low birth weight Other

Orally, casein protein-predominant formula has been associated with an increased risk for metabolic acidosis in preterm infants when compared to using humanized whey protein-predominant or special low birth weight formulas.

  1. Fok TF, So LY, Lee NN, et al. Late metabolic acidosis and poor weight gain in moderately pre-term babies fed with a casein-predominant formula: a continuing need for caution. Ann Trop Paediatr 1989;9(4):243-7.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no official standardized dose of casein protein. The right amount depends on your overall diet, body size, activity level, and goals.

Most casein supplements provide about 20 to 30 grams of protein per serving, but you should follow the directions on the product label. Many people take it once a day, often in the evening or before bed because of its slow digestion.

Remember that your total daily protein from all foods matters most. If you are unsure how much protein you need, or you have a health condition such as kidney disease, check with your pharmacist or doctor before adding a protein supplement.

Pregnancy & Breastfeeding

Casein Protein & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those found in foods.

Casein Protein & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those found in foods.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

© 2026 Therapeutic Research Center

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 60 references that drive our Casein Protein monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Marchesini G, Dioguardi FS, Bianchi GP, et al. Long-term oral branched-chain amino acid treatment in chronic hepatic encephalopathy. A randomized double-blind casein-controlled trial. The Italian Multicenter Study Group. J Hepatol 1990;11:92-101. PubMed
  2. Potter SM, Baum JA, Teng H, et al. Soy protein and isoflavones: their effects on blood lipids and bone density in postmenopausal women. Am J Clin Nutr 1998;68:1375S-9S. PubMed
  3. Nilausen K, Meinertz H. Variable lipemic response to dietary soy protein in healthy, normolipemic men. Am J Clin Nutr 1998;68:1380S-4S. PubMed
  4. Teixeira SR, Potter SM, Weigel R, et al. Effects of feeding 4 levels of soy protein for 3 and 6 wk on blood lipids and apolipoproteins in moderately hypercholesterolemic men. Am J Clin Nutr 2000;71:1077-84. PubMed
  5. Tonstad S, Smerud K, Hoie L. A comparison of the effects of 2 doses of soy protein or casein on serum lipids, serum lipoproteins, and plasma total homocysteine in hypercholesterolemic subjects. Am J Clin Nutr 2002;76:78-84. PubMed
  6. Teede HJ, Dalais FS, Kotsopoulos D, et al. Dietary soy has both beneficial and potentially adverse cardiovascular effects: a placebo-controlled study in men and postmenopausal women. J Clin Endocrinol Metab 2001;86:3053-60. DOI
  7. Nilausen, K. and Meinertz, H. Lipoprotein(a) and dietary proteins: casein lowers lipoprotein(a) concentrations as compared with soy protein. Am.J.Clin.Nutr. 1999;69(3):419-425. PubMed
  8. Meinertz, H., Nilausen, K., and Hilden, J. Alcohol-extracted, but not intact, dietary soy protein lowers lipoprotein(a) markedly. Arterioscler.Thromb.Vasc.Biol. 2-1-2002;22(2):312-316. PubMed
  9. Dalais, F. S., Ebeling, P. R., Kotsopoulos, D., McGrath, B. P., and Teede, H. J. The effects of soy protein containing isoflavones on lipids and indices of bone resorption in postmenopausal women. Clin Endocrinol.(Oxf) 2003;58(6):704-709. PubMed
  10. Cuevas, A. M., Irribarra, V. L., Castillo, O. A., Yanez, M. D., and Germain, A. M. Isolated soy protein improves endothelial function in postmenopausal hypercholesterolemic women. Eur.J Clin.Nutr. 2003;57(8):889-894. PubMed
  11. Hermansen, K., Hansen, B., Jacobsen, R., Clausen, P., Dalgaard, M., Dinesen, B., Holst, J. J., Pedersen, E., and Astrup, A. Effects of soy supplementation on blood lipids and arterial function in hypercholesterolaemic subjects. Eur.J Clin.Nutr. 2005;59(7 PubMed
  12. Meinertz, H., Nilausen, K., and Faergeman, O. Soy protein and casein in cholesterol-enriched diets: effects on plasma lipoproteins in normolipidemic subjects. Am J Clin Nutr 1989;50(4):786-793. PubMed
  13. van Raaij, J. M., Katan, M. B., Hautvast, J. G., and Hermus, R. J. Effects of casein versus soy protein diets on serum cholesterol and lipoproteins in young healthy volunteers. Am J Clin Nutr 1981;34(7):1261-1271. PubMed
  14. van Raaij, J. M., Katan, M. B., West, C. E., and Hautvast, J. G. Influence of diets containing casein, soy isolate, and soy concentrate on serum cholesterol and lipoproteins in middle-aged volunteers. Am J Clin Nutr 1982;35(5):925-934. PubMed
  15. Gooderham, M. H., Adlercreutz, H., Ojala, S. T., Wahala, K., and Holub, B. J. A soy protein isolate rich in genistein and daidzein and its effects on plasma isoflavone concentrations, platelet aggregation, blood lipids and fatty acid composition of plasm
Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Brand directory

Brands that make products with Casein Protein

203 brands in our database make a supplement containing Casein Protein.

Product directory

Supplement products with Casein Protein

879 products in our database contain Casein Protein. Open any to see its full ingredient list and every drug interaction we check.

Casien+ Milk Chocolate by Legion Powder 1022 Gram(s) · 2.25 lb(s) View ingredients & interactions Celebrate ReBuild Cookies & Cream by Celebrate Powder 18.4 Ounce(s) · 522.5 Gram(s) View ingredients & interactions Celebrate ReBuild Iced Macchiato by Celebrate Powder 17.79 Ounce(s) · 504.3 Gram(s) View ingredients & interactions Chewable Calcium 600 mg + D3 Coffee Mocha Flavor by Mason Natural Tablet Or Pill 100 Chewable(s) View ingredients & interactions Chewable Calcium 600 mg | D3 400 IU (10 mcg) Coffee Mocha Flavor by Mason Natural Tablet Or Pill 100 Chewable(s) View ingredients & interactions Chocolate by ON Optimum Nutrition Powder 12 lb(s) · 5455 Gram(s) View ingredients & interactions Chocolate Chocolate Chip Nutrition Shakes by iSatori Powder 1.22 lbs View ingredients & interactions CLA Powder Chocolate by GNC Total Lean Powder 10.04 Ounce(s) · 285 Gram(s) View ingredients & interactions CLA Powder Vanilla Wafer by GNC Total Lean Powder 10.05 Oz(s) · 285 Gram(s) View ingredients & interactions CLA Powder Vanilla Waffer by GNC Total Lean Powder 10.04 oz. · 285 Gram(s) View ingredients & interactions CLA Shake Dark Chocolate by Ab Cuts Sleek & Lean Powder 16.9 Oz(s) · 480 Gram(s) · 1.1 lbs View ingredients & interactions Classic ALLWHEY Chocolate by ALLMAX Powder 5 lbs · 2.27 KG(s) · 80 Ounce(s) View ingredients & interactions CollaGenius Chocolicious by Nootopia Powder 18.44 Ounce(s) · 558 Gram(s) View ingredients & interactions Colloidal Silver 10 PPM 50 mcg by Bronson Liquid 4 fl. Oz. · 118 mL View ingredients & interactions Combat Powder Chocolate Peanut Butter by MusclePharm Powder 5 lb · 2.27 kg View ingredients & interactions Combat Powder Triple Berry by MusclePharm Powder 4 lb · 1.8 kg View ingredients & interactions Combat Protein Powder Chocolate Milk by MusclePharm Powder 40 oz. · 2.5 lbs · 1150 Gram(s) View ingredients & interactions CombatXL Mass Gainer by MusclePharm Powder View ingredients & interactions CombatXL Mass Gainer Chocolate by MP MusclePharm Powder 192 Ounce(s) · 12 lb(s) · 5.44 KG(s) View ingredients & interactions CombatXL Mass Gainer Chocolate Peanut Butter by MP MusclePharm Powder 192 Ounce(s) · 12 lb(s) · 5.44 KG(s) View ingredients & interactions CombatXL Mass Gainer Vanilla by MP MusclePharm Powder 192 Ounce(s) · 12 lb(s) · 5.44 KG(s) View ingredients & interactions Complete Protein RX Dutch Chocolate by IronMagLabs Powder 32 oz. · 908 Gram(s) View ingredients & interactions Complete Protein RX French Vanilla by IronMagLabs Powder 32 oz. · 908 Gram(s) View ingredients & interactions Conjugated Linoleic Acid (CLA) by BulkSupplements.com Powder 500 Gram(s) · 17.6 Ounce(s) View ingredients & interactions
Pharmacist Counseling Corner

Casein Protein: Common Questions

What is Casein Protein used for, and does it work?
People use Casein Protein for a range of reasons, but according to the Natural Medicines database the current clinical evidence is insufficient to confirm it works for the specific conditions it has been studied for. See the graded list on this page, and talk to your pharmacist or doctor before relying on it for any condition.
Does Casein Protein interact with prescription medications?
We do not currently list any known drug interactions for Casein Protein. This does not guarantee that none exist, so always confirm with your pharmacist before combining it with your medications.
How are Casein Protein interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Casein Protein with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Casein Protein interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Casein Protein used for?
It is mainly used as a high-quality protein source to support muscle growth and recovery, increase daily protein intake, and provide a slow release of amino acids, often taken at night.
What is the difference between casein and whey?
Both come from milk and are complete proteins, but whey digests quickly while casein digests slowly over several hours. Many people use whey after workouts and casein before bed.
Can I take casein if I am lactose intolerant?
Many people with lactose intolerance tolerate casein powders well because they contain little lactose, but some products still have small amounts. Choose a low-lactose product and start with a small serving.
Is Casein Protein safe during pregnancy or breastfeeding?
Eating casein in normal dairy foods is fine, but concentrated protein supplements have not been well studied in pregnancy or breastfeeding, so talk to your doctor before using them.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Keep exploring

Products that contain Casein Protein

A rotating sample of real supplements in our database that list Casein Protein — open any to see its full ingredients and every drug interaction we check.

See all 879 products with Casein Protein →
Where next
Supplement interaction checkerCheck any supplement or product against your medications Drug–drug interactionsCheck two or more of your medications against each other Browse medications A–ZEvery drug we’ve checked against herbs & supplements NDC & pricing lookupFind a drug’s NDCs, packaging and costs Ask a pharmacistFree, personal answer from our licensed team

Have a question about Casein Protein?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist