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Dietary supplement

Whey Protein (Grass-Fed) Ingredients & Drug Interactions

by BulkSupplements.com

Whey Protein (Grass-Fed) label
See full label image
Powder Category: Amino Acid/protein
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Whey Protein (Grass-Fed) against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Major

Whey Protein (Grass-Fed) is a dietary supplement by BulkSupplements.com with 1 active ingredient. Its ingredients are commonly taken for muscle building and recovery, increasing daily protein intake, weight management.Based on those ingredients, 53 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Whey Protein. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Whey Protein (Grass-Fed) by BulkSupplements.com

Ask about any prescription or over-the-counter medication and we check it for interactions with Whey Protein (Grass-Fed) by BulkSupplements.com — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Whey Protein (Grass-Fed) by BulkSupplements.com

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: whey protein from grass-fed sources. Whey protein is a complete protein derived from milk that provides all nine essential amino acids your body can't make on its own.

There are no inactive ingredients listed for this powder.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: Muscle building and protein intake support.
  • We looked for evidence on: Athletic performance, Exercise-induced muscle damage, HIV/AIDS-related wasting, Mitochondrial myopathies, Obesity, Sarcopenia — and 3 related terms.
  • The strongest evidence on file: Whey Protein is rated "Possibly Effective" for Athletic performance (Natural Medicines).
  • Also on file: Whey Protein is rated "Insufficient Reliable Evidence To Rate" for HIV/AIDS-related wasting, Obesity, Sarcopenia, Exercise-induced muscle damage, and more.

Whey protein has possibly effective evidence for athletic performance — meaning the research suggests it may help with strength or muscle gains when you're training. For osteoporosis and COPD, the evidence rates it as possibly ineffective.

For age-related cognitive decline and HIV/AIDS-related wasting, we don't hold enough reliable evidence to know whether it works.

The evidence, ingredient by ingredient Whey Protein

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Whey protein is generally well tolerated by most healthy adults when used as directed. The most common side effects are dose-related and include acne, bloating, cramps, diarrhea, fatigue, headache, nausea, acid reflux, reduced appetite, and thirst.

Multiple case reports link whey protein supplements to the onset or worsening of acne, especially in teenagers and young adults; stopping the supplement has typically cleared the acne. Because concentrated whey protein supplements aren't as well studied as whey as a food, check with your doctor before starting, especially if you're taking it in high doses.

Side effects, ingredient by ingredient Whey Protein

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Whey Protein.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: Parkinson's medications.
  • For scale: 53 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Double-check this product before starting if you take levodopa (Parkinson disease medication) — whey protein can interfere with how well it works and may worsen tremor and stiffness. Also verify any quinolone antibiotics (like ciprofloxacin), tetracycline antibiotics (like doxycycline), or bisphosphonates (bone health drugs) — the minerals in whey protein block their absorption, so you'll need to space them apart.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

Whey protein may help with athletic performance if you're training. If you take levodopa for Parkinson disease, or any quinolone antibiotic, tetracycline antibiotic, or bisphosphonate, you'll need to time it carefully — talk to your pharmacist first.

Watch for acne and digestive side effects, and check in with your doctor if you're using high-dose supplements.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Dec 21, 2024.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Whey Protein (Grass-Fed), straight from the product label.

Brand BulkSupplements.com
Barcode (UPC) X000TE87SZ
Net contents 1 Kilogram(s); 35.3 Ounce(s); 2.2 Pound(s)
Market status On market
Date entered into DSLD Dec 21, 2024
DSLD ID 312355
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Whey Protein (Grass-Fed) by BulkSupplements.com, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
30 Gram(s)
Maximum serving Sizes:
30 Gram(s)
Servings per container
33
UPC/BARCODE
X000TE87SZ
IngredientAmount% DV
Whey Protein30 Gram(s)--

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Brand IP Statement(s)

Bulksupplements.com Clean & pure bulk supplements

Formulation

Free of: Added sugar, soy, yeast, additives

Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement, take 30 grams (about 4 tbsp), or as directed by a physician.

General Statements

Use an accurate milligram scale.

New

Storage

Contents are sold by weight, not volume. Settling may occur. Store in a dry, cool place

Precautions

Allergen information: Dairy

Always consult a physician before taking any dietary supplement.

Keep out of reach of children.

FDA Disclaimer Statement

Warning: This product is not intended to diagnose, treat, cure, or prevent any disease.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Whey Protein (Grass-Fed) by BulkSupplements.com label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Whey Protein (Grass-Fed) label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Whey Protein (Grass-Fed) by BulkSupplements.com

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size30 Gram(s) Dosage formPowder Servings per container33 Amounts shown are per serving.

Whey Protein

Interacts with
53 drugs
30 Gram(s) per serving

Whey protein is a high-quality, complete protein made from cow's milk that can help people meet protein needs and support muscle growth when combined...

Whey Protein monograph & interactions
Interaction report

Whey Protein (Grass-Fed) by BulkSupplements.com Drug Interactions

Want to check YOUR meds against Whey Protein (Grass-Fed)?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
53Drugs
5 Major 48 Moderate

Ingredients driving the most interactions

Whey Protein 53

Individual Drug Interactions

The ingredients in Whey Protein (Grass-Fed) interact with 53 drugs. Click any drug to see the details.

1 of the 1 ingredient in Whey Protein (Grass-Fed) interact with drugs. Each result below shows which ingredient is responsible. Whey Protein

Each ingredient & the kinds of drugs it affects

For each ingredient in Whey Protein (Grass-Fed) with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Whey Protein4 drug types · 53 drugs

Levodopa

Theoretically, whey protein might decrease levodopa absorption.
Small clinical studies show that concomitant ingestion of protein or high doses of leucine or isoleucine (100 mg/kg) and levodopa can exacerbate tremor, rigidity, and the "on-off" syndrome in patients with Parkinson disease.

Likelihood Probable Evidence D
Bisphosphonates

Theoretically, whey protein might reduce the absorption of bisphosphonates.
Whey protein contains minerals such as calcium that bind bisphosphonates in the gut. Advise patients to take bisphosphonates at least 30 minutes before whey protein, but preferably at a different time of day.

Likelihood Probable Evidence D
Quinolone Antibiotics

Theoretically, whey protein might decrease quinolone absorption.
Whey protein contains minerals, such as calcium, that can bind to quinolones in the gut. To avoid this interaction, advise patients to take oral quinolones at least 2 hours before or 4-6 hours after whey protein.

Likelihood Probable Evidence D
Tetracycline Antibiotics

Theoretically, whey protein might decrease tetracycline absorption.
Whey protein contains minerals, such as calcium, that bind to tetracyclines in the gut. To avoid this interaction, advise patients to take oral tetracyclines at least 2 hours before or 4-6 hours after whey protein.

Likelihood Probable Evidence D
Whey Protein full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Whey Protein (Grass-Fed), from the product label.

BulkSupplements.com

See all BulkSupplements.com products
Name
BulkSupplements.com
Street Address
7511 Eastgate Rd
City
Henderson
State
NV
ZipCode
89011
Web Address
BulkSupplements.com
Pharmacist Counseling Corner

Whey Protein (Grass-Fed) by BulkSupplements.com: Common Questions

Does Whey Protein (Grass-Fed) by BulkSupplements.com interact with any medications?
Yes. Based on its ingredients, Whey Protein (Grass-Fed) has a known interaction with 53 medications, including 5 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Whey Protein (Grass-Fed) contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Will whey protein actually help me build muscle or get stronger?
The research we have rates whey protein as possibly effective for athletic performance, which means the evidence suggests it may help with strength or muscle gains if you're training. Results depend on your workout routine and overall diet, so it's one tool among many.
What side effects should I watch for?
The most common ones are bloating, cramps, diarrhea, nausea, headache, and fatigue — and these are usually dose-related, so they often ease if you take less. Acne is another concern, especially in younger people; if it develops or gets worse, stopping the product often clears it up.
Is it safe to use while pregnant or breastfeeding?
We don't have safety data on file for whey protein in pregnancy or breastfeeding, so there isn't enough information to know either way. Talk with your doctor or pharmacist about your individual situation.
Why does this product interact with antibiotics?
Whey protein contains minerals like calcium that bind to certain antibiotics in your gut and prevent your body from absorbing them. That's why you need to take those drugs several hours apart from your whey protein.
Does grass-fed whey have different interactions than regular whey?
The interaction data we hold is for whey protein generally. Both sources are whey — the difference is the diet of the dairy cows — but the protein itself behaves the same way in your body.

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

Not sure if Whey Protein (Grass-Fed) is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Whey Protein (Grass-Fed) label
Go deeper

The Full Monographs Behind Whey Protein (Grass-Fed)’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Whey Protein

Interacts with 53 drugs

Whey protein is a high-quality, complete protein made from cow's milk that can help people meet protein needs and support muscle growth when combined with exercise. It is generally safe for...

Read the full Whey Protein monograph →
Sources

Sources & How We Checked

Whey Protein (Grass-Fed)'s label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 25 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Whey Protein 25 references
  1. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
  2. Maton PN, Burton ME. Antacids revisited: a review of their clinical pharmacology and recommended therapeutic use. Drugs 1999;57:855-70.
  3. Bell SJ. Whey protein concentrates with and without immunoglobulins: a review. J Med Food 2000;3:1-13. PubMed
  4. Nutt JG, Woodward WR, Hammerstad JP, et al. The "on-off" phenomenon in Parkinson's disease. Relation to levodopa absorption and transport. N Engl J Med 1984;310:483-8. PubMed
  5. Baruzzi A, Contin M, Riva R, et al. Influence of meal ingestion time on pharmacokinetics of orally administered levodopa in parkinsonian patients. Clin Neuropharmacol 1987;10:527-37. PubMed
  6. Juncos JL, Fabbrini G, Mouradian MM, et al. Dietary influences on the antiparkinsonian response to levodopa. Arch Neurol 1987;44:1003-5. PubMed
  7. Eriksson T, Granerus AK, Linde A, et al. "On-off" phenomenon in Parkinson's disease: relationship between dopa and other large neutral amino acids in plasma. Neurology 1988;38:1245-8. PubMed
  8. Semla TP, Beizer JL, Higbee MD. Geriatric Dosage Handbook. 4th ed. Hudson, OH: Lexicomp, 1998.
  9. Pletz MW, Petzold P, Allen A, et al. Effect of calcium carbonate on bioavailability of orally administered gemifloxacin. Antimicrob Agents Chemother 2003;47:2158-60.. PubMed
  10. Peters ML, Leonard M, Licata AA. Role of alendronate and risedronate in preventing and treating osteoporosis. Cleve Clin J Med 2001;68:945-51. PubMed
  11. Micke, P., Beeh, K. M., and Buhl, R. Effects of long-term supplementation with whey proteins on plasma glutathione levels of HIV-infected patients. Eur.J Nutr 2002;41(1):12-18. PubMed
  12. Chitapanarux, T., Tienboon, P., Pojchamarnwiputh, S., and Leelarungrayub, D. Open-labeled pilot study of cysteine-rich whey protein isolate supplementation for nonalcoholic steatohepatitis patients. J Gastroenterol.Hepatol. 2009;24(6):1045-1050. PubMed
  13. Sataloff, R. T., Bittermann, T., Marks, L., Lurie, D., and Hawkshaw, M. The effects of glutathione enhancement on sensorineural hearing loss. Ear Nose Throat J 2010;89(9):422-433.
  14. Zhu, K., Meng, X., Kerr, D. A., Devine, A., Solah, V., Binns, C. W., and Prince, R. L. The effects of a two-year randomized, controlled trial of whey protein supplementation on bone structure, IGF-1, and urinary calcium excretion in older postmenopausal
  15. Bjorkman, M. P., Pilvi, T. K., Kekkonen, R. A., Korpela, R., and Tilvis, R. S. Similar effects of leucine rich and regular dairy products on muscle mass and functions of older polymyalgia rheumatica patients: a randomized crossover trial. J Nutr Health A
  16. 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. PubMed
  17. Gouni-Berthold, I., Schulte, D. M., Krone, W., Lapointe, J. F., Lemieux, P., Predel, H. G., and Berthold, H. K. The whey fermentation product malleable protein matrix decreases TAG concentrations in patients with the metabolic syndrome: a randomised plac
  18. Errichiello, L., Pezzella, M., Santulli, L., Striano, S., Zara, F., Minetti, C., Mainardi, P., and Striano, P. A proof-of-concept trial of the whey protein alfa-lactalbumin in chronic cortical myoclonus. Mov Disord. 2011;26(14):2573-2575. PubMed
  19. Carcillo, J. A., Dean, J. M., Holubkov, R., Berger, J., Meert, K. L., Anand, K. J., Zimmerman, J., Newth, C. J., Harrison, R., Burr, J., Willson, D. F., and Nicholson, C. The randomized comparative pediatric critical illness stress-induced immune suppres
  20. Chungchunlam, S. M., Moughan, P. J., Henare, S. J., and Ganesh, S. Effect of time of consumption of preloads on measures of satiety in healthy normal weight women. Appetite 2012;59(2):281-288. PubMed
  21. Rencuzogullari I, Börekçi A, Karakoyun S, et al. Coronary thrombosis in three coronary arteries due to whey protein. Am J Emerg Med. 2017;35(4):664.e3-664.e4. PubMed
  22. Silverberg NB. Whey protein precipitating moderate to severe acne flares in 5 teenaged athletes. Case Reports Cutis. 2012;90(2):70-2.
  23. Simonart T. Acne and whey protein supplementation among bodybuilders. Dermatology. 2012;225(3):256-8. PubMed
  24. Pontes TC, Costa Fernandes Filho GM, Pereira Trindade AS, Sobral Filho JF. Incidence of acne vulgaris in young adult users of protein-calorie supplements in the city of João Pessoa-PB. An Bras Dermatol. 2013;88(6):907-12.
  25. Adebamowo CA, Spiegelman D, Berkey CS, et al. Milk consumption and acne in teenaged boys. J Am Acad Dermatol. 2008 May;58(5):787-93. PubMed

See these in context on the Whey Protein monograph →

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

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