Interactions on record — worth a quick check against your medications. Based on 3 of 4 ingredients. Check your meds →
Dietary supplement

Fermented Vitamin C 250 mg Ingredients & Drug Interactions

by New Chapter

Fermented Vitamin C 250 mg label
See full label image
Tablet Or Pill Category: Botanical With Nutrients
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Fermented Vitamin C 250 mg 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

Fermented Vitamin C 250 mg is a dietary supplement by New Chapter with 4 active ingredients. Its ingredients are commonly taken for common cold and immune support, antioxidant support, skin health and collagen formation.Based on those ingredients, 1,193 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Eleuthero Root Extract, Astragalus Root Extract, Vitamin C. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Fermented Vitamin C 250 mg by New Chapter

Ask about any prescription or over-the-counter medication and we check it for interactions with Fermented Vitamin C 250 mg by New Chapter — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Fermented Vitamin C 250 mg by New Chapter

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

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 1 of its 4 active ingredients.
  • “Immune Support Blend” is a proprietary blend — the label gives one combined amount (15 mg) without saying how much of each component you get.

This fermented tablet contains four active ingredients. Vitamin C is the main ingredient at 250 mg per serving, used to support immune function and prevent deficiency.

The other three actives are grouped in an Immune Support Blend: Eleuthero Root Extract, Astragalus Root Extract, and European Elder Berry Extract. The product also contains several inactive ingredients — fillers, binders, and processing agents like rice, gum acacia, silica, and lecithin — that help form and preserve the tablet.

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 and antioxidant health.
  • We looked for evidence on: Common cold, Exercise-induced respiratory infections, Coronavirus disease 2019 (COVID-19), Wound healing, Skin health, Colds and flu.
  • 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 "Likely Ineffective" for Coronavirus disease 2019 (COVID-19).
  • Also on file: Astragalus is rated "Insufficient Reliable Evidence To Rate" for Wound healing.

Vitamin C is proven effective for preventing and treating vitamin C deficiency. For other uses, the evidence is mixed: it's rated possibly effective for anemia of chronic disease, cataracts, exercise-related respiratory infections, and atrial fibrillation.

For the other actives in the blend, the data we hold shows insufficient evidence to rate their effectiveness for the conditions studied — meaning there isn't enough reliable research yet to know if they work.

The evidence, ingredient by ingredient Vitamin C Eleuthero Astragalus

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 3 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • 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 supplement doses, though doses above 2 grams daily can cause abdominal cramps, heartburn, diarrhea, nausea, and headache. At very high doses taken intravenously or orally over time, it may increase kidney stone risk in susceptible people.

Eleuthero is generally well tolerated short-term but can cause diarrhea, nausea, headache, nervousness, and possibly higher blood pressure — especially at higher doses. Long-term safety data is limited.

Astragalus is similarly well tolerated short-term in healthy adults, though human safety data is sparse. The product safety notes advise against high-dose vitamin C supplements in pregnancy; for eleuthero and astragalus, there isn't enough safety data, so they should be avoided in pregnancy and while breastfeeding.

Talk with your pharmacist or doctor before using this product if you're pregnant, nursing, or planning to become pregnant.

Side effects, ingredient by ingredient Vitamin C Eleuthero Astragalus

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?
  • 3 of the 3 matched ingredients can interact with medications — Astragalus, Eleuthero, Vitamin C.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; cancer treatments; diabetes medications; heart-rhythm medications; lithium.
  • For scale: 1,194 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, check with your pharmacist if you use blood thinners or antiplatelet drugs (warfarin, aspirin, clopidogrel), chemotherapy drugs, diabetes medications, thyroid medication (levothyroxine), the heart drug digoxin, lithium, immunosuppressants, or the antiviral indinavir. These are the drug types with documented Moderate interactions; your exact medications need to be verified in the tool on this page.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This fermented vitamin C supplement is appropriate for people at risk of vitamin C deficiency or looking for general immune support, but it has significant documented interactions with blood thinners, cancer drugs, thyroid medication, and diabetes medications. If you take any prescription medication — especially anticoagulants, chemotherapy, levothyroxine, digoxin, lithium, or diabetes drugs — run it through the checker on this page before you start.

Talk with your pharmacist to make sure it's right for you.

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

Assessment coverage: 3 of 4 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Mar 25, 2025.

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 Fermented Vitamin C 250 mg, straight from the product label.

Brand New Chapter
Barcode (UPC) 727783902573
Net contents 60 100% Vegan Tablets
Market status On market
Date entered into DSLD Mar 25, 2025
DSLD ID 326593
Product type Botanical With Nutrients
Supplement form Tablet Or Pill
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Kosher, Organic, 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 Fermented Vitamin C 250 mg by New Chapter, 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:
1 Tablet(s)
Maximum serving Sizes:
1 Tablet(s)
Servings per container
60
UPC/BARCODE
727783902573
IngredientAmount% DV
Vitamin C250 mg278%
Immune Support Blend15 mg--
Eleuthero Root Extract0 NP--
Astragalus Root Extract0 NP--
European Elder Berry Extract 0 NP--

Other ingredients: Soy Flour, Orange, Powder, Saccharomyces cerevisiae, Papain, Deactivated, Bromelain, Deactivated, Lactic Acid Bacteria, Gum Acacia, Brown Rice, Silica, Tapioca Maltodextrin, Sunflower Lecithin, Palm Oil, Guar 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.
Suggested/Recommended/Usage/Directions

Suggested use: One tablet daily. Can be taken anytime, even on an empty stomach.

Formulation

Certified gluten-free by NSF; Certified Vegan; No artificial flavors or colors.

Certified gluten-free by NSF; Certified Vegan; No artificial flavors or colors.

The New Chapter Money-Back Guarantee We proudly stand behind every product we make. However, if you are not satisfied, please visit www.newchapter.com/guarantee for refund details.

Formulated for absorption Nutrition crafted for: Immune support & collagen protection

Made with organic vegetables & herbs Certified organic by Where Food Comes From Organic, Castle Rock, CO, USA

Non GMO Project Verified nongmoproject.org NSF Certified Gluten-free

Certified Vegan vegan.org

Manufactured in the US from Globally Sourced Ingredients

General Statements

Please refer to newchapter.com for more information about this product and its benefits.

For questions or comments call 888-874-4461

Please recycle this bottle after use.

Precautions

Caution: As with any dietary supplement, advise your healthcare professional of the use of this product if you have a medical condition or are taking medication. If you are nursing, pregnant, or considering pregnancy, you should consult your healthcare professional prior to using this product.

Keep out of reach of children.

Contains: Fermented soy.

FDA Disclaimer Statement

This statement has 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 2021 New Chapter, Inc. New Chapter Est. 1982

Formula

The magic inside: Whole-food Vitamin C with elderberry 250 mg

OU (Kosher)

Seals/Symbols

Whole Food Comes From Organic Non GMO Project Verified nongmoproject.org NSF Certified Gluten-free OU (Kosher) Certified Vegan vegan.org

FDA Statement of Identity

Dietary Supplement

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

See for yourself

Fermented Vitamin C 250 mg by New Chapter label

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

Fermented Vitamin C 250 mg 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 Fermented Vitamin C 250 mg by New Chapter

These are the 4 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Tablet(s) Dosage formTablet Or Pill Servings per container60 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
250 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

Immune Support Blend

15 mg per serving

Other (inactive) ingredients: Soy Flour, Orange, Powder, Saccharomyces cerevisiae, Papain, Deactivated, Bromelain, Deactivated, Lactic Acid Bacteria, Gum Acacia, Brown Rice, Silica, Tapioca Maltodextrin, Sunflower Lecithin, Palm Oil, Guar Gum. These complete the product’s ingredient list but are not active constituents.

Interaction report

Fermented Vitamin C 250 mg by New Chapter Drug Interactions

Want to check YOUR meds against Fermented Vitamin C 250 mg?

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
1,193Drugs
734 Moderate 459 Minor

Ingredients driving the most interactions

Eleuthero Root Extract 1,140
Astragalus Root Extract 208
Vitamin C 207

Individual Drug Interactions

The ingredients in Fermented Vitamin C 250 mg interact with 1,193 drugs. Click any drug to see the details.

3 of the 4 ingredients in Fermented Vitamin C 250 mg interact with drugs. Each result below shows which ingredient is responsible. Eleuthero Root Extract Astragalus Root Extract Vitamin C

Each ingredient & the kinds of drugs it affects

For each ingredient in Fermented Vitamin C 250 mg 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.

Eleuthero Root Extract10 drug types · 1,140 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, eleuthero may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
In vitro and animal research shows that a constituent of eleuthero, dihydroxybenzoic acid, appears to inhibit platelet aggregation. Concomitant use with anticoagulant or antiplatelet drugs might increase the risk of bleeding. This effect has not been reported in humans.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, eleuthero might have additive effects when used with antidiabetes drugs.
Animal research suggests that certain constituents of eleuthero have hypoglycemic activity in both healthy and diabetic animals. A small study in adults with type 2 diabetes also shows that taking eleuthero for 3 months can lower blood glucose levels. However, one very small study in healthy individuals shows that taking powdered eleuthero 3 grams, 40 minutes prior to a 75-gram oral glucose tolerance test, significantly increases postprandial blood glucose levels when compared with placebo. These contradictory findings might be due to patient-specific variability and variability in active ingredient ratios.

Likelihood Possible Evidence B
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, eleuthero might increase levels of drugs metabolized by CYP1A2.
In vitro and animal research suggest that standardized extracts of eleuthero inhibit CYP1A2. This effect has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, eleuthero might increase levels of drugs metabolized by CYP2C9.
In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP2C9. This effect has not been reported in humans.

Likelihood Possible Evidence D
Digoxin (Lanoxin)

Eleuthero might increase serum digoxin levels and increase the risk of side effects.
In one case report, a 74-year-old male who was stabilized on digoxin presented with an elevated serum digoxin level after starting an eleuthero supplement, without symptoms of toxicity. After stopping the supplement, serum digoxin levels returned to normal. It is not clear whether this was due to a pharmacokinetic interaction or to interference with the digoxin assay. Although the product was found to be free of digoxin and digitoxin, it was not tested for other contaminants.

Likelihood Unlikely Evidence D
Immunosuppressants

Theoretically, eleuthero might interfere with immunosuppressive drugs because of its immunostimulant activity.
Animal and in vitro research shows that eleuthero extracts have immunomodulatory effects, including increasing cellular and humoral activity.

Likelihood Possible Evidence D
P-Glycoprotein Substrates

Theoretically, eleuthero might increase levels of P-glycoprotein substrates.
In vitro research suggests that eleuthero can inhibit the multi-drug transporter protein, P-glycoprotein. However, it is too soon to tell if this is clinically important. This interaction has not been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, eleuthero might increase levels of drugs metabolized by CYP2D6.
In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP2D6. However, research in healthy human volunteers has found that taking eleuthero 485 mg twice daily for 14 days does not inhibit CYP2D6 drug metabolism.

Likelihood Unlikely Evidence B
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, eleuthero might increase levels of drugs metabolized by CYP3A4.
In vitro and animal research suggest that standardized extracts of eleuthero might inhibit CYP3A4. However, research in healthy human volunteers has found that taking eleuthero 485 mg twice daily for 14 days does not inhibit CYP3A4 drug metabolism.

Likelihood Unlikely Evidence B
Organic Anion-Transporting Polypeptide Substrates (Oatp)

Theoretically, eleuthero might decrease levels of drugs metabolized by OATP.
In vitro research suggests that eleuthero inhibits OATP2B1, which might reduce the bioavailability of oral drugs that are substrates of OATP2B1. Due to the weak inhibitory effect identified in this study, this interaction is not likely to be clinically significant.

Likelihood Possible Evidence D
Eleuthero Root Extract full monograph & interactions

Astragalus Root Extract4 drug types · 208 drugs

Antidiabetes Drugs

Theoretically, taking astragalus with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research in humans shows that astragalus might have hypoglycemic effects. Theoretically, taking astragalus, especially in combination with other hypoglycemic agents, might increase the risk of hypoglycemia.

Likelihood Probable Evidence A
Cyclophosphamide

Theoretically, astragalus might interfere with cyclophosphamide therapy.
Evidence regarding the effect of astragalus on immunosuppression caused by cyclophosphamide is conflicting. Some animal research suggests that astragalus reverses cyclophosphamide-induced immunosuppression. However, other animal research shows no effect.

Likelihood Possible Evidence D
Immunosuppressants

Theoretically, astragalus might interfere with immunosuppressive therapy.
Astragalus seems to stimulate immune function. Theoretically, taking astragalus might decrease the effects of immunosuppressive therapy.

Likelihood Possible Evidence D
Lithium

Theoretically, astragalus might increase levels and adverse effects of lithium.
Animal research suggests that astragalus has diuretic properties. Theoretically, due to this diuretic effect, astragalus might reduce excretion and increase levels of lithium.

Likelihood Probable Evidence D
Astragalus Root Extract full monograph & interactions

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
The maker

Brand information

Manufacturer and brand details for Fermented Vitamin C 250 mg, from the product label.

New Chapter

See all New Chapter products
Name
New Chapter, Inc.
Street Address
90 Technology Drive
City
Brattleboro
State
VT
ZipCode
05301
Phone Number
888-874-4461
Web Address
www.newchapter.com
Pharmacist Counseling Corner

Fermented Vitamin C 250 mg by New Chapter: Common Questions

Does Fermented Vitamin C 250 mg by New Chapter interact with any medications?
Yes. Based on its ingredients, Fermented Vitamin C 250 mg has a known interaction with 1,193 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Fermented Vitamin C 250 mg contains 4 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.
Can I take this if I'm on warfarin or another blood thinner?
Not without checking first with your pharmacist. Vitamin C at higher doses may reduce how well warfarin works by affecting how your body absorbs it. Eleuthero and astragalus also have theoretical concerns with bleeding risk. Your pharmacist needs to review your exact dose and medications.
Is this safe during pregnancy?
Normal amounts of vitamin C from food are fine, but avoid high-dose supplements unless your doctor says otherwise. Eleuthero and astragalus don't have enough safety data, so they should be avoided in pregnancy. Talk with your doctor or pharmacist before starting this product if you're pregnant or planning to become pregnant.
What is Eleuthero Root, and what does it do?
Eleuthero (also called Siberian ginseng) is an herbal extract included in the Immune Support Blend. The research data we hold shows insufficient evidence to rate its effectiveness for the conditions studied, so we can't say what it reliably does.
Can I take this with my thyroid medication?
Vitamin C can increase how well your body absorbs levothyroxine (Synthroid), which may affect your thyroid levels. Don't take them at the same time — check with your pharmacist about spacing them apart and whether your dose needs adjustment.
What are the most common side effects?
Vitamin C at doses above 2 grams daily can cause stomach cramps, heartburn, diarrhea, nausea, and headache. Eleuthero may cause diarrhea, nausea, headache, and nervousness, especially at higher doses. These effects are generally mild.
Does this product contain any fillers?
Yes. The tablet contains several inactive ingredients including rice, silica, gum acacia, and sunflower lecithin to help form and preserve it. These are standard excipients and don't count toward the active ingredients.

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.

Fermented Vitamin C 250 mg label
Go deeper

The Full Monographs Behind Fermented Vitamin C 250 mg’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

Eleuthero

Interacts with 1,140 drugs

Eleuthero is an herb traditionally used as an 'adaptogen' to fight fatigue, boost energy, and help the body handle stress. The scientific evidence behind these uses is limited and mixed, so...

Read the full Eleuthero monograph → Herb & supplement monograph

Astragalus

Interacts with 208 drugs

Astragalus is a root used for centuries in traditional Chinese medicine, mainly to support the immune system and help the body cope with stress. While early studies are interesting, strong h...

Read the full Astragalus monograph →
Sources

Sources & How We Checked

Fermented Vitamin C 250 mg'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 88 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.
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Astragalus 13 references
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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.

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