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Dietary supplement

Liquid Vitamin C 1000 mg Natural Orange Flavor Ingredients & Drug Interactions

by NaturesPlus

Liquid Vitamin C 1000 mg Natural Orange Flavor label
See full label image
Liquid Category: Other Combinations
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Liquid Vitamin C 1000 mg Natural Orange Flavor 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: Moderate

Liquid Vitamin C 1000 mg Natural Orange Flavor is a dietary supplement by NaturesPlus with 2 active ingredients. Its ingredients are commonly taken for common cold and immune support, antioxidant support, skin health and collagen formation.Based on those ingredients, 208 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Vitamin C, Lemon Bioflavonoid Complex. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus

Ask about any prescription or over-the-counter medication and we check it for interactions with Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus

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 Aug 13, 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 2 of its 2 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains 2 active ingredients: vitamin C and a lemon bioflavonoid complex. Vitamin C is the main player here at 1000 mg per serving — it's an antioxidant your body needs for immune function, collagen formation, and wound healing.

The lemon bioflavonoid complex adds additional plant compounds that work alongside vitamin C. The liquid comes in a natural orange flavor with water, fructose, glycerin, natural color, natural flavors, and xanthan gum as inactive ingredients to give it taste and texture.

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: immune support.
  • We looked for evidence on: Acute bronchitis, Allergic rhinitis (hay fever), Atopic disease, Coronavirus disease 2019 (COVID-19), Exercise-induced respiratory infections, Gingivitis — and 4 related terms.
  • The strongest evidence on file: Vitamin C is rated "Possibly Effective" for Exercise-induced respiratory infections (Natural Medicines).
  • Also on file: Vitamin C is rated "Possibly Ineffective" for Acute bronchitis, Helicobacter pylori.
  • Also on file: Vitamin C is rated "Likely Ineffective" for Coronavirus disease 2019 (COVID-19).

Vitamin C is effective for preventing and treating vitamin C deficiency. For other uses — anemia related to chronic disease, atrial fibrillation, cataracts, and exercise-induced respiratory infections — the evidence suggests it may be helpful, though more research is needed to confirm.

For lemon bioflavonoid complex, the evidence we hold doesn't establish its effectiveness for allergic rhinitis, anxiety, respiratory tract infections, high blood pressure, or kidney stones. The data rates these uses as having insufficient reliable evidence.

The evidence, ingredient by ingredient Vitamin C Lemon

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 2 of the 2 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 2 of 2.
  • General safety write-ups exist for 2 of 2.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Vitamin C is generally well tolerated at normal dietary and supplement doses. At very high doses — above 2 grams daily — you may experience abdominal cramps, diarrhea, heartburn, nausea, or headache.

Kidney stones have been reported in people prone to them. Lemon in food amounts is safe; fresh lemon juice at higher medicinal doses can cause heartburn and digestive upset in some people.

For pregnancy and breastfeeding: normal amounts of vitamin C from food and prenatal vitamins are fine, but high-dose supplements need your doctor's approval. The safety data on lemon bioflavonoid complex in pregnancy and breastfeeding isn't on file — talk with your doctor or pharmacist before using it if you're pregnant or nursing.

Side effects, ingredient by ingredient Vitamin C Lemon

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 2 of the 2 matched ingredients can interact with medications — Lemon, Vitamin C.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; cancer treatments.
  • For scale: 208 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.

Before taking this product, double-check with your doctor or pharmacist if you're on birth control or hormone replacement therapy (vitamin C can raise estrogen levels), blood thinners like warfarin (high-dose vitamin C may weaken it), thyroid medication like levothyroxine (vitamin C boosts absorption), chemotherapy drugs, antifungal itraconazole, or HIV medications like indinavir. Also flag if you take antipsychotics like fluphenazine or aluminum-containing products.

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. Moderate medication interactions have been identified, and safety information is well characterized.

This product may help if you're deficient in vitamin C or looking for its possible benefits for respiratory infections and cataracts. If you take birth control, warfarin, thyroid medication, chemotherapy, or antifungal drugs, you'll want to clear this with your doctor or pharmacist first — vitamin C can meaningfully change how those medications work.

Check your complete medication list before starting.

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

Assessment coverage: 2 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 23, 2023.

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 Liquid Vitamin C 1000 mg Natural Orange Flavor, straight from the product label.

Brand NaturesPlus
Barcode (UPC) 097467250055
Net contents 8 Fluid Ounce(s); 236.56 Milliliter(s)
Market status On market
Date entered into DSLD Aug 23, 2023
DSLD ID 298499
Product type Other Combinations
Supplement form Liquid
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Gluten Free
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 Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus, 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:
29.57 Milliliter(s)
Maximum serving Sizes:
29.57 Milliliter(s)
Servings per container
8
UPC/BARCODE
097467250055
IngredientAmount% DV
Vitamin C1000 mg1111%
Calories60 Calorie(s)--
Total Sugars11 Gram(s)--
added Sugars11 Gram(s)22%
Total Carbohydrates16 Gram(s)6%
Lemon Bioflavonoid Complex100 mg--

Other ingredients: Water, Fructose, Glycerin, Natural color, Natural Flavors, Xanthan Gum

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.
Formula

NaturesPlus Liquid C with Lemon Bioflavonoids is an exciting, cutting-edge Vitamin C supplement that delivers superior quality Vitamin C and lemon bioflavonoids in a convenient liquid formation. There's a reason why Vitamin C is the most well-known and highly regarded vitamin in the world: This antioxidant supports many of the body's systems, including the vascular system and natural defenses. For those who prefer supplements in liquid or suspension form, NaturesPlus Liquid C delivers 1000 mg of Vitamin C and 100 mg of lemon bioflavonoids in just two delicious, orange-flavored tablespoons. NaturesPlus Liquid C with Lemon Bioflavonoids is highlighted by its incredibly delicious orange taste. Each drop is bursting with the amazing flavor of ripe, sweet, freshly picked oranges. Heavenly citrus highlights and delightfully tangy undertones create a refreshing taste sensation that has to be experienced to be believed!

Natural orange flavor with other natural flavors

Formulation

Vegetarian

Gluten free

Immune support

Free from artificial colors and artificial preservatives. Free from all of the major allergens identified in the U.S. Food Allergen Labeling and Consumer Protection Act.

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Directions: Shake well. Take two tablespoons or one capful (about 30 mL) once daily.

NaturePlus Liquid Vitamin C with Lemon Bioflavonoids is so delicious, you can enjoy it straight from the bottle or mixed with a favorite beverage.

General Statements

Convenient drip-proof bottle

Storage

Refrigerate after opening.

Keep tightly closed.

Precautions

Keep out of reach of children.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Brand IP Statement(s)

Copyright Natural Organics

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

See for yourself

Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus label

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

Liquid Vitamin C 1000 mg Natural Orange Flavor 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 Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus

These are the 2 active ingredients this product is made of. Select any to open its full monograph.

Serving size29.57 Milliliter(s) Dosage formLiquid Servings per container8 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Vitamin C

Interacts with
207 drugs
1000 mg per serving Form: Ascorbic Acid

Vitamin C (ascorbic acid) is an essential nutrient your body needs but cannot make, so you must get it from food or supplements. It's important for im...

Vitamin C monograph & interactions

Lemon Bioflavonoid Complex

Interacts with
1 drug
100 mg per serving Form: Citrus limon

Lemon is a common citrus fruit that is a good source of vitamin C and citric acid, and it is widely used in food, drinks, and home remedies. While it...

Lemon Bioflavonoid Complex monograph & interactions

Other (inactive) ingredients: Water, Fructose, Glycerin, Natural color, Natural Flavors, Xanthan Gum. These complete the product’s ingredient list but are not active constituents.

Interaction report

Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus Drug Interactions

Want to check YOUR meds against Liquid Vitamin C 1000 mg Natural Orange Flavor?

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
208Drugs
101 Moderate 107 Minor

Ingredients driving the most interactions

Vitamin C 207
Lemon Bioflavonoid Complex 1

Individual Drug Interactions

The ingredients in Liquid Vitamin C 1000 mg Natural Orange Flavor interact with 208 drugs. Click any drug to see the details.

2 of the 2 ingredients in Liquid Vitamin C 1000 mg Natural Orange Flavor interact with drugs. Each result below shows which ingredient is responsible. Vitamin C Lemon Bioflavonoid Complex

Each ingredient & the kinds of drugs it affects

For each ingredient in Liquid Vitamin C 1000 mg Natural Orange Flavor with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Vitamin C13 drug types · 207 drugs

Alkylating Agents

Theoretically, antioxidant effects of vitamin C might reduce the effectiveness of alkylating agents.
The use of antioxidants like vitamin C during chemotherapy is controversial. There is concern that antioxidants could reduce the activity of chemotherapy drugs that generate free radicals, such as cyclophosphamide, chlorambucil, carmustine, busulfan, and thiotepa. In contrast, some researchers theorize that antioxidants might make chemotherapy more effective by reducing oxidative stress that could interfere with apoptosis (cell death) of cancer cells. More evidence is needed to determine what effect, if any, antioxidants such as vitamin C have on chemotherapy.

Likelihood Possible Evidence D
Aluminum

Vitamin C can increase the amount of aluminum absorbed from aluminum compounds.
Research in animals and humans shows that vitamin C increases aluminum absorption, theoretically by chelating aluminum and keeping it in solution where it is available for absorption. In people with normal renal function, urinary excretion of aluminum will likely increase, making aluminum retention and toxicity unlikely. Patients with renal failure who take aluminum-containing compounds such as phosphate binders should avoid vitamin C supplements in doses above the recommended dietary allowances.

Likelihood Probable Evidence B
Antitumor Antibiotics

Theoretically, the antioxidant effects of vitamin C might reduce the effectiveness of antitumor antibiotics.
The use of antioxidants like vitamin C during chemotherapy is controversial. There is concern that antioxidants could reduce the activity of chemotherapy drugs which generate free radicals, such as doxorubicin. In contrast, some researchers theorize that antioxidants might make chemotherapy more effective by reducing oxidative stress that could interfere with apoptosis (cell death) of cancer cells. More evidence is needed to determine what effects, if any, antioxidants such as vitamin C have on chemotherapy.

Likelihood Possible Evidence D
Estrogens

Vitamin C might increase blood levels of estrogens.
Increases in plasma estrogen levels of up to 55% occur under some circumstances when vitamin C is taken concurrently with oral contraceptives or hormone replacement therapy, including topical products. It is suggested that vitamin C prevents oxidation of estrogen in the tissues, regenerates oxidized estrogen, and reduces sulfate conjugation of estrogen in the gut wall. When tissue levels of vitamin C are high, these processes are already maximized and supplemental vitamin C does not have any effect on estrogen levels. Increases in plasma estrogen levels may occur when patients who are deficient in vitamin C take supplements. Monitor these patients for estrogen-related side effects.

Likelihood Probable Evidence B
Fluphenazine (Prolixin)

Theoretically, vitamin C might decrease levels of fluphenazine.
In one patient there was a clinically significant decrease in fluphenazine levels when vitamin C (500 mg twice daily) was started. The mechanism is not known, and there is no further data to confirm this interaction.

Likelihood Possible Evidence D
Indinavir (Crixivan)

Vitamin C can modestly reduce indinavir levels.
One pharmacokinetic study shows that taking vitamin C 1 gram orally once daily along with indinavir 800 mg orally three times daily reduces the area under the concentration-time curve of indinavir by 14%. The mechanism of this interaction is unknown, but it is unlikely to be clinically significant in most patients. The effect of higher doses of vitamin C on indinavir levels is unknown.

Likelihood Probable Evidence B
Levothyroxine (Synthroid, Others)

Vitamin C can increase levothyroxine absorption.
Two clinical studies in adults with poorly controlled hypothyroidism show that swallowing levothyroxine with a glass of water containing vitamin C 500-1000 mg in solution reduces thyroid stimulating hormone (TSH) levels and increases thyroxine (T4) levels when compared with taking levothyroxine alone. This suggests that vitamin C increases the oral absorption of levothyroxine, possibly due to a reduction in pH.

Likelihood Probable Evidence B
Warfarin (Coumadin)

High-dose vitamin C might reduce the levels and effectiveness of warfarin.
Vitamin C in high doses may cause diarrhea and possibly reduce warfarin absorption. There are reports of two people who took up to 16 grams daily of vitamin C and had a reduction in prothrombin time. Lower doses of 5-10 grams daily can also reduce warfarin absorption. In many cases, this does not seem to be clinically significant. However, a case of warfarin resistance has been reported for a patient who took vitamin C 500 mg twice daily. Cessation of vitamin C supplementation resulted in a rapid increase in international normalized ratio (INR). Tell patients taking warfarin to avoid taking vitamin C in excessively high doses (greater than 10 grams daily). Lower doses may be safe, but the anticoagulation activity of warfarin should be monitored. Patients who are stabilized on warfarin while taking vitamin C should avoid adjusting vitamin C dosage to prevent the possibility of warfarin resistance.

Likelihood Possible Evidence D
Acetaminophen (Tylenol, Others)

High-dose vitamin C might slightly prolong the clearance of acetaminophen.
A small pharmacokinetic study in healthy volunteers shows that taking high-dose vitamin C (3 grams) 1.5 hours after taking acetaminophen 1 gram slightly increases the apparent half-life of acetaminophen from around 2.3 hours to 3.1 hours. Ascorbic acid competitively inhibits sulfate conjugation of acetaminophen. However, to compensate, elimination of acetaminophen glucuronide and unconjugated acetaminophen increases. This effect is not likely to be clinically significant.

Likelihood Probable Evidence B
Aspirin

Acidification of the urine by vitamin C might increase aspirin levels.
It has been suggested that acidification of the urine by vitamin C could increase reabsorption of salicylates by the renal tubules, and increase plasma salicylate levels. However, short-term use of up to 6 grams daily of vitamin C does not seem to affect urinary pH or salicylate excretion, suggesting this interaction is not clinically significant.

Likelihood Possible Evidence B
Choline Magnesium Trisalicylate (Trilisate)

Acidification of the urine by vitamin C might increase choline magnesium trisalicylate levels.
It has been suggested that acidification of the urine by vitamin C could increase reabsorption of salicylates by the renal tubules, and increase plasma salicylate levels. However, short-term use of up to 6 grams daily of vitamin C does not seem to affect urinary pH or salicylate excretion, suggesting this interaction probably is not clinically significant.

Likelihood Possible Evidence B
Niacin

Vitamin C might decrease the beneficial effects of niacin on high-density lipoprotein (HDL) cholesterol levels.
A combination of niacin and simvastatin (Zocor) effectively raises HDL cholesterol levels in patients with coronary disease and low HDL levels. Clinical research shows that taking a combination of antioxidants (vitamin C, vitamin E, beta-carotene, and selenium) along with niacin and simvastatin (Zocor) attenuates this rise in HDL, specifically the HDL-2 and apolipoprotein A1 fractions, by more than 50% in patients with coronary disease. It is not known whether this adverse effect is due to a single antioxidant such as vitamin C, or to the combination. It also is not known whether it will occur in other patient populations.

Likelihood Possible Evidence A
Salsalate (Disalcid)

Acidification of the urine by vitamin C might increase salsalate levels.
It has been suggested that acidification of the urine by vitamin C could increase reabsorption of salicylates by the renal tubules, and increase plasma salicylate levels. However, short-term use of up to 6 grams/day vitamin C does not seem to affect urinary pH or salicylate excretion, suggesting this interaction probably is not clinically significant.

Likelihood Possible Evidence B
Vitamin C full monograph & interactions

Lemon Bioflavonoid Complex1 drug type · 1 drug

Itraconazole (Sporanox)

Theoretically, taking itraconazole capsules or tablets with a beverage containing lemon might increase the levels and clinical effects of itraconazole.
In one case report, dissolving itraconazole tablets in a small amount of specific beverages containing lemon prior to administration increased the level of itraconazole in a lung transplant patient. In this case, the increased bioavailability was desirable and was likely due to improved tablet dissolution in the acidic beverage.

Likelihood Possible Evidence D
Lemon Bioflavonoid Complex full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Liquid Vitamin C 1000 mg Natural Orange Flavor, from the product label.

NaturesPlus

See all NaturesPlus products
Name
Natural Organics Laboratories, Inc. makers of Nature's Plus
Street Address
9500 New Horizons Blvd
City
Amityville
State
New York
ZipCode
11701
Web Address
www.naturesplus.com
Pharmacist Counseling Corner

Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus: Common Questions

Does Liquid Vitamin C 1000 mg Natural Orange Flavor by NaturesPlus interact with any medications?
Yes. Based on its ingredients, Liquid Vitamin C 1000 mg Natural Orange Flavor has a known interaction with 208 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Liquid Vitamin C 1000 mg Natural Orange Flavor contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is 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 this vitamin C supplement prevent me from getting sick?
Vitamin C is possibly effective for exercise-induced respiratory infections — the kind athletes sometimes get after intense training. For general cold or flu prevention in everyday life, the evidence we hold doesn't establish it as effective. It's worth discussing with your doctor if you're looking to prevent a specific type of infection.
Is liquid vitamin C better than tablets?
The product facts we have don't compare liquid to tablet forms. Both are generally well tolerated. Your choice may come down to preference — some people find liquids easier to swallow, while others prefer tablets for convenience.
Can I take this if I'm pregnant?
Normal amounts of vitamin C from food and prenatal vitamins are considered safe during pregnancy. High-dose supplements need your doctor's approval. Since this product delivers 1000 mg per serving, talk with your doctor or pharmacist to make sure the dose is right for you during pregnancy.
What side effects might I notice from this product?
At 1000 mg, you're below the upper safe limit of 2 grams daily, so serious side effects are unlikely. Some people may experience mild abdominal cramps, diarrhea, or heartburn, especially if they're sensitive to vitamin C or citrus. The lemon bioflavonoid complex may add to digestive upset in some users.
Why does this product have lemon in it if it's a vitamin C supplement?
Lemon bioflavonoids are plant compounds that naturally accompany vitamin C in citrus fruits. They're included to work alongside the vitamin C, though the evidence we hold doesn't establish what specific benefits the lemon bioflavonoid complex provides on its own.
Can I take this with my other vitamins and supplements?
That depends on what else you're taking. This product doesn't interact with most supplements, but vitamin C can interact with certain medications — especially birth control, blood thinners, thyroid drugs, and chemotherapy. Use the interaction checker on this page with your complete list, or ask your pharmacist to review it before you combine them.

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

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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.

Liquid Vitamin C 1000 mg Natural Orange Flavor label
Go deeper

The Full Monographs Behind Liquid Vitamin C 1000 mg Natural Orange Flavor’s Ingredients

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

Herb & supplement monograph

Vitamin C

Interacts with 207 drugs

Vitamin C (ascorbic acid) is an essential nutrient your body needs but cannot make, so you must get it from food or supplements. It's important for immune function, collagen, and acts as an...

Read the full Vitamin C monograph → Herb & supplement monograph

Lemon

Interacts with 1 drug

Lemon is a common citrus fruit that is a good source of vitamin C and citric acid, and it is widely used in food, drinks, and home remedies. While it can support hydration and a healthy diet...

Read the full Lemon monograph →
Sources

Sources & How We Checked

Liquid Vitamin C 1000 mg Natural Orange Flavor'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 53 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.

Vitamin C 51 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Back DJ, Breckenridge AM, MacIver M, et al. Interaction of ethinyloestradiol with ascorbic acid in man. Br Med J (Clin Res Ed) 1981;282:1516.
  3. Morris JC, Beeley L, Ballantine N. Interaction of ethinyloestradiol with ascorbic acid in man [letter]. Br Med J (Clin Res Ed) 1981;283:503.
  4. Labriola D, Livingston R. Possible interactions between dietary antioxidants and chemotherapy. Oncology 1999;13:1003-8.
  5. Dwyer JH, Merz NB, Shirocre AM, et al. Progression of early atherosclerosis and intake of vitamin C and vitamin E from supplements and food. The Los Angeles Atherosclerosis Study. 41st Annual Conference on Cardiovascular Disease Epidemiology and Prevent
  6. Levine M, Rumsey SC, Daruwala R, et al. Criteria and recommendations for vitamin C intake. JAMA 1999;281:1415-23. PubMed
  7. Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
  8. Segal S, Kaminski S. Drug-nutrient interactions. American Druggist 1996 Jul;42-8.
  9. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington, DC: National Academy Press, 2000. Available at: http://www.nap.edu/books/0309069351/html/.
  10. Houston JB, Levy G. Drug biotransformation interactions in man VI: Acetaminophen and ascorbic acid. J Pharm Sci 1976;65:1218-21. PubMed
  11. Brown BG, Zhao XQ, Chait A, et al. Simvastatin and niacin, antioxidant vitamins, or the combination for the prevention of coronary disease. N Engl J Med 2001;345:1583-93. DOI
  12. Rosenthal G. Interaction of ascorbic acid and warfarin. JAMA 1971;215:1671. DOI
  13. Hume R, Johnstone JM, Weyers E. Interaction of ascorbic acid and warfarin. JAMA 1972;219:1479. DOI
  14. Smith EC, Skalski RJ, Johnson GC, Rossi GV. Interaction of ascorbic acid and warfarin. JAMA 1972;221:1166. DOI
  15. Traxer O, Huet B, Poindexter J, et al. Effect of ascorbic acid consumption on urinary stone risk factors. J Urol 2003;170:397-401.. PubMed
  16. Domingo JL, Gomez M, Llobet JM, Richart C. Effect of ascorbic acid on gastrointestinal aluminum absorption (letter). Lancet 1991;338:1467.
  17. Domingo JL, Gomez M, Llobet JM, Corbella J. Influence of some dietary constituents on aluminum absorption and retention in rats. Kidney Int 1991;39:598-601. PubMed
  18. Partridge NA, Regnier FE, White JL, Hem SL. Influence of dietary constituents on intestinal absorption of aluminum. Kidney Int 1989;35:1413-7. PubMed
  19. Mc Leod DC, Nahata MC. Inefficacy of ascorbic acid as a urinary acidifier (letter). N Engl J Med 1977;296:1413. DOI
  20. Hansten PD, Hayton WL. Effect of antacid and ascorbic acid on serum salicylate concentration. J Clin Pharmacol 1980;20:326-31. PubMed
  21. Dysken MW, Cumming RJ, Channon RA, Davis JM. Drug interaction between ascorbic acid and fluphenazine. JAMA 1979;241:2008. DOI
  22. Vihtamaki T, Parantainen J, Koivisto AM, et al. Oral ascorbic acid increases plasma oestradiol during postmenopausal hormone replacement therapy. Maturitas 2002;42:129-35. PubMed
  23. Slain D, Amsden JR, Khakoo RA, et al. Effect of high-dose vitamin C on the steady-state pharmacokinetics of the protease inhibitor indinavir in healthy volunteers. Pharmacotherapy 2005;25:165-70. PubMed
  24. Cheung MC, Zhao XQ, Chait A, et al. Antioxidant supplements block the response of HDL to simvastatin-niacin therapy in patients with coronary artery disease and low HDL. Arterioscler Thromb Vasc Biol 2001;21:1320-6. PubMed
  25. Feetam CL, Leach RH, Meynell MJ. Lack of a clinically important interaction between warfarin and ascorbic acid. Toxicol Appl Pharmacol 1975;31:544-7. PubMed
  26. Weintraub M, Griner PF. Warfarin and ascorbic acid: lack of evidence for a drug interaction. Toxicol Appl Pharmacol 1974;28:53-6. PubMed
  27. Lee DH, Folsom AR, Harnack L, et al. Does supplemental vitamin C increase cardiovascular disease risk in women with diabetes? Am J Clin Nutr 2004;80:1194-200. PubMed
  28. Taylor EN, Stampfer MJ, Curhan GC. Dietary factors and the risk of incident kidney stones in men: new insights after 14 years of follow-up. J Am Soc Nephrol 2004;15:3225-32. PubMed
  29. Ward NC, Hodgson JM, Croft KD, et al. The combination of vitamin C and grape-seed polyphenols increases blood pressure: a randomized, double-blind, placebo-controlled trial. J Hypertens 2005;23:427-34.. PubMed
  30. Prasad KN. Rationale for using high-dose multiple dietary antioxidants as an adjunct to radiation therapy and chemotherapy. J Nutr 2004;134:3182S-3S. PubMed
  31. Conklin KA. Cancer chemotherapy and antioxidants. J Nutr 2004;134:3201S-3204S. PubMed
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See these in context on the Vitamin C monograph →

Lemon 2 references
  1. Ruggenenti P, Caruso MR, Cortinovis M, et al. Fresh lemon juice supplementation for the prevention of recurrent stones in calcium oxalate nephrolithiasis: A pragmatic, prospective, randomised, open, blinded endpoint (PROBE) trial. EClinicalMedicine 2021;4 PubMed
  2. Umemura K, Katada Y, Nakagawa S, et al. Improved absorption of itraconazole tablet by co-administration with lemon beverages in a lung transplant recipient: A case report. J Infect Chemother 2022;28(8):1203-1207. PubMed

See these in context on the Lemon 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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