Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

GPLC GlycoCarn With CoQ10 Ingredients & Drug Interactions

by NOW

GPLC GlycoCarn With CoQ10 label
See full label image
Capsule Category: Other Combinations
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 GPLC GlycoCarn With CoQ10 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

GPLC GlycoCarn With CoQ10 is a dietary supplement by NOW with 3 active ingredients. Its ingredients are commonly taken for heart health, statin-related muscle aches, migraine prevention.Based on those ingredients, 216 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Coenzyme Q10, Propionyl-L-Carnitine HCl, Glycine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against GPLC GlycoCarn With CoQ10 by NOW

Ask about any prescription or over-the-counter medication and we check it for interactions with GPLC GlycoCarn With CoQ10 by NOW — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of GPLC GlycoCarn With CoQ10 by NOW

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 3 of its 3 active ingredients.
  • “GlycoCarn(R) GPLC Complex” is a proprietary blend — the label gives one combined amount (1,516 mg) without saying how much of each component you get.

This product has three active ingredients. Glycine is an amino acid your body uses for protein synthesis and other functions.

Coenzyme Q10 (CoQ10) is a compound your cells make naturally to produce energy and protect against oxidative damage. Propionyl-L-carnitine is a form of L-carnitine, an amino acid derivative that helps your body transport fatty acids for energy, especially in the heart and muscles.

The product also contains inactive ingredients: cellulose, calcium carbonate, and magnesium stearate, which are common binders and fillers.

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: Heart health and circulation support.
  • We looked for evidence on: Angina, Cardiovascular disease (CVD), Congestive heart failure (CHF), Erectile dysfunction (ED), Hyperlipidemia, Hypertension — and 4 related terms.
  • The strongest evidence on file: Propionyl-l-carnitine is rated "Possibly Effective" for Angina (Natural Medicines).
  • Also on file: Propionyl-l-carnitine is rated "Possibly Effective" for Cardiovascular disease (CVD), Congestive heart failure (CHF), Intermittent claudication.
  • Also on file: Coenzyme Q10 is rated "Possibly Effective" for Congestive heart failure (CHF), Myocardial infarction (MI).

Glycine is rated possibly effective for schizophrenia, though the evidence is limited. For other conditions like ADHD, benign prostatic hyperplasia (enlarged prostate), cystic fibrosis, and a rare metabolic disorder called 3-phosphoglycerate dehydrogenase deficiency, the evidence isn't strong enough to rate it.

Coenzyme Q10 is likely effective for CoQ10 deficiency itself and possibly effective for fibromyalgia, migraine headaches, congestive heart failure, and diabetic neuropathy (nerve damage from diabetes). Propionyl-L-carnitine is possibly effective for ulcerative colitis, heart failure, angina (chest pain), and cardiovascular disease.

The evidence for each ingredient varies, so talk to your healthcare provider about whether this product matches what you're looking to address.

The evidence, ingredient by ingredient Coenzyme Q10 Glycine Propionyl-l-carnitine

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.

Coenzyme Q10 is generally well tolerated; no serious adverse effects have been reported in clinical studies. The most common side effects are gastrointestinal—appetite loss, diarrhea, heartburn, nausea, and vomiting—occurring in fewer than 1% of users.

Headache, dizziness, and insomnia have also been reported. Glycine is generally well tolerated at typical doses, but long-term safety data are limited.

Rarely, mild sedation, irritability, insomnia, or stomach upset have been reported; these resolve quickly if you stop taking it. Propionyl-L-carnitine is well tolerated short-term but carries limited long-term safety data.

Diarrhea, nausea, vomiting, and a fishy body odor (from a metabolite) are the most common side effects. Bronchitis and back pain were reported more often in one trial than with placebo.

Side effects, ingredient by ingredient Coenzyme Q10 Glycine Propionyl-l-carnitine

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 — Propionyl-l-carnitine, Coenzyme Q10, Glycine.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 216 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.

Check your medications against these drug types before taking this product: blood thinners like warfarin (Coumadin) and acenocoumarol (Sintrom)—Moderate severity; clozapine (Clozaril), an antipsychotic—Moderate; thyroid hormone replacement—Moderate; and blood pressure medications—Minor. The blood thinner interaction is the most serious: coenzyme Q10 may reduce warfarin's effectiveness, and propionyl-L-carnitine may increase it, creating unpredictable bleeding risk.

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 be worth considering if you're interested in heart health, migraine relief, or energy support and have no medication conflicts—but the evidence for those uses varies by ingredient. If you take blood thinners, antipsychotics, thyroid medication, or blood pressure drugs, you need to check your specific medications first because this product can interact with them.

Talk to your pharmacist before starting, especially if you're pregnant, breastfeeding, or on any prescriptions.

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

Assessment coverage: 3 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jul 24, 2015.

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 GPLC GlycoCarn With CoQ10, straight from the product label.

Brand NOW
Barcode (UPC) 733739000576
Net contents 60 Veg Capsule(s)
Market status On market
Date entered into DSLD Jul 24, 2015
DSLD ID 47657
Product type Other Combinations
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy 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 GPLC GlycoCarn With CoQ10 by NOW, 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:
2 Veg Capsule(s)
Maximum serving Sizes:
2 Veg Capsule(s)
Servings per container
30
UPC/BARCODE
733739000576
IngredientAmount% DV
Glycine346 mg--
Coenzyme Q1060 mg--
Propionyl-L-Carnitine HCl1170 mg--
GlycoCarn(R) GPLC Complex1516 mg--

Other ingredients: Cellulose, Calcium Carbonate, Magnesium Stearate

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.
Precautions

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

Caution: For adults only.

Consult physician if pregnant/nursing, taking medication, or have a medical condition.

Keep out of reach of children.

Do Not Eat Freshness Packet. Keep in Bottle.

Brand IP Statement(s)

GlycoCarn(R) is a registered trademark of Sigma-Tau HealthScience and is manufactured under USA production patent 6,703,042 and other foreign patents.

The combination of GlycoCarn(R) GPLC and CoQ10 is patented by Sigma-Tau Industries under USA patent 6,814,972.

GlycoCarn(R) (Glycine Propionyl-L-Carnitine) GPLC is a patented, highly bioavailable form of Carnitine.

GlycoCarn(R), particularly when combined with exercise, has been shown to promote healthy nitric oxide (NO) production.*

Storage

Store in a cool, dry place after opening.

General Statements

Please Recycle.

Amino Acids

Family owned since 1968.

Carnitine is an amino acid that plays a crucial role in muscle function.*

NO is notable for its vasodilating effects, which help to enhance blood flow to muscles and the heart.* NO also facilitates the production of energy at the cellular level and aids in the removal of lactic acid and other metabolic waste products from muscle tissue.*

Natural color variation may occur in this product.

Capsule size

Cellular Energy*

~ Facilitates the Use of Fat for Energy* ~ Supports NO Production and Enhances Blood Flow*

Seals/Symbols

GMP QUALITY ASSURED

Non-GMO

FDA Statement of Identity

A Dietary Supplement

Formulation

Vegetarian/Vegan

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.

Suggested/Recommended/Usage/Directions

Suggested Usage: Take 2 capsules 1 to 3 times daily, preferably with food.

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.

General

CODE 0057B V3

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

See for yourself

GPLC GlycoCarn With CoQ10 by NOW label

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

GPLC GlycoCarn With CoQ10 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 GPLC GlycoCarn With CoQ10 by NOW

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Veg Capsule(s) Dosage formCapsule Servings per container30 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.

Coenzyme Q10

Interacts with
198 drugs
60 mg per serving

CoQ10 is a vitamin-like substance your body makes naturally that helps cells produce energy and acts as an antioxidant. It is generally well tolerated...

Coenzyme Q10 monograph & interactions

GlycoCarn(R) GPLC Complex

1516 mg per serving

Other (inactive) ingredients: Cellulose, Calcium Carbonate, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

GPLC GlycoCarn With CoQ10 by NOW Drug Interactions

Want to check YOUR meds against GPLC GlycoCarn With CoQ10?

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
216Drugs
44 Moderate 172 Minor

Ingredients driving the most interactions

Coenzyme Q10 198
Propionyl-L-Carnitine HCl 19
Glycine 1

Individual Drug Interactions

The ingredients in GPLC GlycoCarn With CoQ10 interact with 216 drugs. Click any drug to see the details.

3 of the 3 ingredients in GPLC GlycoCarn With CoQ10 interact with drugs. Each result below shows which ingredient is responsible. Coenzyme Q10 Propionyl-L-Carnitine HCl Glycine

Each ingredient & the kinds of drugs it affects

For each ingredient in GPLC GlycoCarn With CoQ10 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.

Coenzyme Q103 drug types · 198 drugs

Alkylating Agents

Coenzyme Q10 has antioxidant effects. Theoretically, this may reduce the activity of chemotherapy drugs that generate free radicals.
Theoretically, antioxidants such as coenzyme Q10 might protect tumor cells from chemotherapeutic agents that work by inducing oxidative stress, such as alkylating agents (e.g., cyclophosphamide) and radiation therapy. The clinical importance of this interaction is unknown.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Coenzyme Q10 is chemically similar to menaquinone and might have vitamin K-like procoagulant effects, which could decrease the effects of warfarin.
Concomitant use of coenzyme Q10 and warfarin might reduce the anticoagulant effects of warfarin. Four cases of decreased warfarin efficacy thought to be due to coenzyme Q10 have been reported. However, there is some preliminary clinical research that suggests coenzyme Q10 might not significantly decrease the effects of warfarin in patients who have a stable INR.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, coenzyme Q10 might have additive effects with antihypertensive drugs.
Some clinical research shows that coenzyme Q10 can significantly lower blood pressure, although other studies have shown conflicting results.

Likelihood Possible Evidence B
Coenzyme Q10 full monograph & interactions

Propionyl-L-Carnitine HCl3 drug types · 19 drugs

Acenocoumarol (Sintrom)

Theoretically, propionyl-L-carnitine might increase the anticoagulant effects of acenocoumarol.
L-carnitine, the parent compound of propionyl-L-carnitine, might enhance the anticoagulant effects of acenocoumarol, an oral anticoagulant similar to warfarin, but shorter-acting. There are at least two case reports of INR elevation when L-carnitine was taken with acenocoumarol. In one case, a 33-year-old male with a previously stable INR had an elevated INR of 4.65 after L-carnitine was started and continued for 10 weeks. INR normalized after discontinuation of the L-carnitine-containing product. It is unclear if such an interaction would also occur with propionyl-L-carnitine.

Likelihood Possible Evidence D
Thyroid Hormone

Theoretically, acetyl-L-carnitine might decrease the effectiveness of thyroid hormone replacement.
L-carnitine appears to act as a peripheral thyroid hormone antagonist by inhibiting entry of thyroid hormone into the nucleus of cells. Taking L-carnitine also seems to diminish some of the symptoms of hyperthyroidism. It is unclear if such an interaction would occur with propionyl-L-carnitine.

Likelihood Possible Evidence B
Warfarin (Coumadin)

Theoretically, propionyl-L-carnitine might increase the anticoagulant effects of warfarin.
L-carnitine, the parent compound of propionyl-L-carnitine, might increase the anticoagulant effects of acenocoumarol, a shorter-acting oral anticoagulant similar to warfarin. There is not enough information to know whether this interaction occurs with propionyl-L-carnitine and warfarin.

Likelihood Possible Evidence D
Propionyl-L-Carnitine HCl full monograph & interactions

Glycine1 drug type · 1 drug

Clozapine (Clozaril)

Theoretically, glycine might decrease the effectiveness of clozapine.
One small clinical study in patients with schizophrenia shows that adding glycine to clozapine therapy worsens symptoms of schizophrenia when compared with clozapine alone. The mechanism of this interaction is unclear.

Likelihood Probable Evidence B
Glycine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for GPLC GlycoCarn With CoQ10, from the product label.

NOW

See all NOW products
Name
NOW Foods
Street Address
395 S. Glen Ellyn Rd.
City
Bloomingdale
State
IL
ZipCode
60108
Web Address
nowfoods.com
Pharmacist Counseling Corner

GPLC GlycoCarn With CoQ10 by NOW: Common Questions

Does GPLC GlycoCarn With CoQ10 by NOW interact with any medications?
Yes. Based on its ingredients, GPLC GlycoCarn With CoQ10 has a known interaction with 216 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
GPLC GlycoCarn With CoQ10 contains 3 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.
Is this safe during pregnancy?
Pregnancy safety data for glycine and coenzyme Q10 are not well established. Propionyl-L-carnitine is specifically advised against in pregnancy. Talk with your doctor or pharmacist before taking this product if you're pregnant—they can weigh your individual situation.
What about breastfeeding?
There isn't enough reliable safety data for glycine or propionyl-L-carnitine during breastfeeding, and coenzyme Q10 safety while breastfeeding hasn't been well studied. Check with your doctor before using this product if you're nursing.
Does this really help with heart health?
Coenzyme Q10 is possibly effective for congestive heart failure, and propionyl-L-carnitine is possibly effective for heart failure and angina. The evidence exists but isn't bulletproof, so talk with your doctor about whether it fits your situation.
What are the most common side effects?
Gastrointestinal symptoms—nausea, diarrhea, heartburn, and stomach upset—are the most common, occurring in a small percentage of users. These are usually mild and stop if you discontinue the product.
Can I take this if I'm on thyroid medication?
Not without checking with your pharmacist first. Propionyl-L-carnitine may theoretically reduce how well thyroid hormone is absorbed into your cells, and we need to assess your specific dose and medication type to be safe.
What is glycine doing in here?
Glycine is an amino acid that may help with schizophrenia symptoms when added to antipsychotic therapy, though the mechanism isn't clear. The product also uses it to support overall amino acid intake, but evidence for other uses in this formulation is limited.

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.

GPLC GlycoCarn With CoQ10 label
Go deeper

The Full Monographs Behind GPLC GlycoCarn With CoQ10’s Ingredients

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

Herb & supplement monograph

Coenzyme Q10

Interacts with 198 drugs

CoQ10 is a vitamin-like substance your body makes naturally that helps cells produce energy and acts as an antioxidant. It is generally well tolerated and is most studied for heart condition...

Read the full Coenzyme Q10 monograph → Herb & supplement monograph

Glycine

Interacts with 1 drug

Glycine is a non-essential amino acid your body makes on its own and that also appears in protein-rich foods. It is most studied for improving sleep quality, where early research is promisin...

Read the full Glycine monograph → Herb & supplement monograph

Propionyl-l-carnitine

Interacts with 19 drugs

Propionyl-l-carnitine is a form of the amino acid derivative carnitine that the body uses to help turn fat into energy, and it is studied mostly for circulation problems like peripheral arte...

Read the full Propionyl-l-carnitine monograph →
Sources

Sources & How We Checked

GPLC GlycoCarn With CoQ10'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 57 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.

Glycine 5 references
  1. Heresco-Levy U, Javitt DC, Ermilov M, et al. Efficacy of high-dose glycine in the treatment of enduring negative symptoms of schizophrenia. Arch Gen Psychiatry 1999;56:29-36.. PubMed
  2. Potkin SG, Jin Y, Bunney BG, Costa J, Gulasekaram B. Effect of clozapine and adjunctive high-dose glycine in treatment-resistant schizophrenia. Am J Psychiatry 1999;156:145-7.. PubMed
  3. Gusev EI, Skvortsova VI, Dambinova SA, et al. Neuroprotective effects of glycine for therapy of acute ischaemic stroke. Cerebrovasc Dis 2000;10:49-60. PubMed
  4. Inagawa K, Kawai N, Ono K, Sukegawa E, Tsubuku S, Takahashi M. Assessment of acute adverse effects of glycine ingestion at a high dose in human volunteers. Seikatsu Eisei. 2006; 50:27-32.
  5. Woods SW, Walsh BC, Hawkins KA, Miller TJ, Saksa JR, D'Souza DC, Pearlson GD, Javitt DC, McGlashan TH, Krystal JH. Glycine treatment of the risk syndrome for psychosis: report of two pilot studies. Eur Neuropsychopharmacol. 2013 Aug;23(8):931-40. PubMed

See these in context on the Glycine monograph →

Coenzyme Q10 40 references
  1. Kamikawa T, Kobayashi A, Yamashita T, et al. Effects of coenzyme Q10 on exercise tolerance in chronic stable angina pectoris. Am J Cardiol 1985;56:247-51. PubMed
  2. Langsjoen P, Willis R, Folkers K. Treatment of essential hypertension with coenzyme Q10. Mol Aspects Med 1994;S265-72. PubMed
  3. Spigset O. Reduced effect of warfarin caused by ubidecarenone. Lancet 1994;334:1372-3. PubMed
  4. Singh RB, Niaz MA, Rastogi SS, et al. Effect of hydrosoluble coenzyme Q10 on blood pressures and insulin resistance in hypertensive patients with coronary artery disease. J Hum Hypertens 1999;13:203-8. PubMed
  5. Portakal O, Ozkaya O, Erden Inal M, et al. Coenzyme Q10 concentrations and antioxidant status in tissues of breast cancer patients. Clin Biochem 2000;33:279-84. PubMed
  6. Lund EL, Quistorff B, Spang-Thomsen M, Kristjansen PE. Effect of radiation therapy on small-cell lung cancer is reduced by ubiquinone intake. Folia Microbiol (Praha) 1998;43:505-6. PubMed
  7. Langsjoen PH, Langsjoen PH, Folkers K. Long-term efficacy and safety of coenzyme Q10 therapy for idiopathic dilated cardiomyopathy. Am J Cardiol 1990;65:521-3. PubMed
  8. Heck AM, DeWitt BA, Lukes AL. Potential interactions between alternative therapies and warfarin. Am J Health Syst Pharm 2000;57:1221-7. DOI
  9. Landbo C, Almdal TP. [Interaction between warfarin and coenzyme Q10]. Ugeskr Laeger 1998;160:3226-7.
  10. Baggio E, Gandini R, Plauncher AC, et al. Italian multicenter study on the safety and efficacy of coenzyme Q10 as adjunctive therapy in heart failure. CoQ10 Drug Surveillance Investigators. Mol Aspects Med 1994;15 Suppl:S287-94. PubMed
  11. Burke BE, Neuenschwander R, Olson RD. Randomized, double-blind, placebo-controlled trial of coenzyme Q10 in isolated systolic hypertension. South Med J 2001;94:1112-7. PubMed
  12. The Huntington Study Group. A randomized, placebo-controlled trial of coenzyme Q10 and remacemide in Huntington's disease. Neurology 2001;57:397-404.
  13. Hodgson JM, Watts GF, Playford DA, et al. Coenzyme Q10 improves blood pressure and glycaemic control: a controlled trial in subjects with type 2 diabetes. Eur J Clin Nutr 2002;56:1137-42. PubMed
  14. Singh RB, Neki NS, Kartikey K, et al. Effect of coenzyme Q10 on risk of atherosclerosis in patients with recent myocardial infarction. Mol Cell Biochem 2003;246:75-82. DOI
  15. Porterfield LM. Why did the response to warfarin change? RN 2000;63:107.
  16. Sandor PS, Di Clemente L, Coppola G, et al. Efficacy of coenzyme Q10 in migraine prophylaxis: A randomized controlled trial. Neurology 2005;64:713-5. PubMed
  17. Engelsen J, Nielsen JD, Winther K. Effect of coenzyme Q10 and Ginkgo biloba on warfarin dosage in stable, long-term warfarin treated outpatients. A randomised, double blind, placebo-crossover trial. Thromb Haemost 2002;87:1075-6. DOI
  18. Berman M, Erman A, Ben-Gal T, et al. Coenzyme Q10 in patients with end-stage heart failure awaiting cardiac transplantation: a randomized, placebo-controlled study. Clin Cardiol 2004;27:295–9. PubMed
  19. Storch A, Jost WH, Vieregge P, et al. Randomized, double-blind, placebo-controlled trial on symptomatic effects of coenzyme Q10 in Parkinson disease. Arch Neurol 2007;64:938-44. DOI
  20. Digiesi V, Cantini F, Oradei A, et al. Coenzyme Q10 in essential hypertension. Mol Aspects Med 1994;15 Suppl:s257-63. PubMed
  21. Yamagami T, Takagi M, Akagami H, et al. Effect of coenzyme Q10 on essential hypertension, a double blind controlled study. In: Folkers KA, Yamamura Y, eds. Biomedical and Clinical Aspects of Coenzyme Q, Vol. 5. Amsterdam: Elsevier Science Publications, 19
  22. Ho MJ, Bellusci A, Wright JM. Blood pressure lowering efficacy of coenzyme Q10 for primary hypertension (review). Cochrane Database Syst Rev 2009;(4):CD007435. PubMed
  23. Rosenfeldt, F. L., Haas, S. J., Krum, H., Hadj, A., Ng, K., Leong, J. Y., and Watts, G. F. Coenzyme Q10 in the treatment of hypertension: a meta-analysis of the clinical trials. J Hum.Hypertens. 2007;21(4):297-306. PubMed
  24. Stamelou, M., Reuss, A., Pilatus, U., Magerkurth, J., Niklowitz, P., Eggert, K. M., Krisp, A., Menke, T., Schade-Brittinger, C., Oertel, W. H., and Hoglinger, G. U. Short-term effects of coenzyme Q10 in progressive supranuclear palsy: a randomized, place DOI
  25. Keogh A, Fenton S, Leslie C, et al. Randomised double-blind, placebo-controlled trial of coenzyme Q, therapy in class II and III systolic heart failure. Heart Lung Circ. 2003;12:135-41.
  26. Gane, E. J., Weilert, F., Orr, D. W., Keogh, G. F., Gibson, M., Lockhart, M. M., Frampton, C. M., Taylor, K. M., Smith, R. A., and Murphy, M. P. The mitochondria-targeted anti-oxidant mitoquinone decreases liver damage in a phase II study of hepatitis C
  27. Lynch, D. R., Perlman, S. L., and Meier, T. A phase 3, double-blind, placebo-controlled trial of idebenone in friedreich ataxia. Arch Neurol. 2010;67(8):941-947. PubMed
  28. Young, J. M., Florkowski, C. M., Molyneux, S. L., McEwan, R. G., Frampton, C. M., Nicholls, M. G., Scott, R. S., and George, P. M. A randomized, double-blind, placebo-controlled crossover study of coenzyme Q10 therapy in hypertensive patients with the me
  29. Ishiyama, T., Morita, Y., Toyama, S., Yamagami, T., and Tsukamoto, N. A clinical study of the effect of coenzyme Q on congestive heart failure. Jpn.Heart J 1976;17(1):32-42. PubMed
  30. Matthews, P. M., Ford, B., Dandurand, R. J., Eidelman, D. H., O'Connor, D., Sherwin, A., Karpati, G., Andermann, F., and Arnold, D. L. Coenzyme Q10 with multiple vitamins is generally ineffective in treatment of mitochondrial disease. Neurology 1993;43(5
  31. Malm, C., Svensson, M., Sjoberg, B., Ekblom, B., and Sjodin, B. Supplementation with ubiquinone-10 causes cellular damage during intense exercise. Acta Physiol Scand. 1996;157(4):511-512. PubMed
  32. Singh, R. B., Wander, G. S., Rastogi, A., Shukla, P. K., Mittal, A., Sharma, J. P., Mehrotra, S. K., Kapoor, R., and Chopra, R. K. Randomized, double-blind placebo-controlled trial of coenzyme Q10 in patients with acute myocardial infarction. Cardiovasc. PubMed
  33. Digiesi V, Cantini F, and Brodbeck B. Effect of coenzyme Q10 on essential arterial hypertension. Current Therapeutic Research 1990;47(5):841-845.
  34. Parkinson Study Group QE3 Investigators, Beal MF, Oakes D, et al. A randomized clinical trial of high-dosage coenzyme Q10 in early Parkinson disease: no evidence of benefit. JAMA Neurol. 2014;71(5):543-52.
  35. Alehagen U, Johansson P, Bjornstedt M, et al. Cardiovascular mortality and N-terminal-proBNP reduced after combined selenium and coenzyme Q10 supplementation: A 5-year prospective randomized double-blind placebo-controlled trial among elderly Swedish citi
  36. Ho MJ, Li EC, Wright JM. Blood pressure lowering efficacy of coenzyme Q10 for primary hypertension. Cochrane Database Syst Rev. 2016 Mar 3;3:CD007435. doi: 10.1002/14651858.CD007435.pub3. PubMed
  37. Tabrizi R, Akbari M, Sharifi N, Lankarani KB, Moosazadeh M, Kolahdooz F, et al. The effects of coenzyme Q10 supplementation on blood pressures among patients with metabolic diseases: a systematic review and meta-analysis of randomized controlled trials. PubMed
  38. Tsai IC, Hsu CW, Chang CH, Tseng PT, Chang KV. Effectiveness of coenzyme Q10 supplementation for reducing fatigue: A systematic review and meta-analysis of randomized controlled trials. Front Pharmacol 2022;13:883251. PubMed
  39. Yaghini O, Hoseini N, Ghazavi MR, et al. A comparative study on the efficacy of coenzyme Q10 and amitriptyline in the prophylactic treatment of migraine headaches in children: A randomized controlled trial. Adv Biomed Res 2022;11:43. PubMed
  40. Hansen KS, Mogensen TH, Agergaard J, et al. High-dose coenzyme Q10 therapy versus placebo in patients with post COVID-19 condition: A randomized, phase 2, crossover trial. Lancet Reg Health Eur 2022. PubMed

See these in context on the Coenzyme Q10 monograph →

Propionyl-l-carnitine 12 references
  1. Cherchi A, Lai C, Onnis E, et al. Propionyl carnitine in stable effort angina. Cardiovasc Drugs Ther 1990;4:481-6. PubMed
  2. Bartels GL, Remme WJ, den Hartog FR, et al. Additional anti-ischemic effects of long-term L-propionylcarnitine in anginal patients treated with conventional antianginal therapy. Cardiovasc Drugs Ther 1995;9:749-53.
  3. Caponnetto S, Canale C, Masperone MA, et al. Efficacy of L-propionylcarnitine treatment in patients with left ventricular dysfunction. Eur Heart J 1994;15:1267-73. PubMed
  4. Benvenga S, Ruggeri RM, Russo A, et al. Usefulness of L-carnitine, a naturally occurring peripheral antagonist of thyroid hormone action, in iatrogenic hyperthyroidism: a randomized, double-blind, placebo-controlled clinical trial. J Clin Endocrinol Meta
  5. Martinez E, Domingo P, Roca-Cusachs A. Potentiation of acenocoumarol action by L-carnitine. J Intern Med 1993;233:94.
  6. Bachmann HU, Hoffmann A. Interaction of food supplement L-carnitine with oral anticoagulant acenocoumarol. Swiss Med Wkly 2004;134:385. PubMed
  7. Gentile V, Vicini P, Prigiotti G, et al. Preliminary observations on the use of propionyl-L-carnitine in combination with sildenafil in patients with erectile dysfunction and diabetes. Curr Med Res Opin 2004;20:1377-84. PubMed
  8. 12761 Benvenga S, Amato A, Calvani M, Trimarchi F. Effects of carnitine on thyroid hormone action. Ann N Y Acad Sci 2004;1033:158-67. PubMed
  9. Brass EP, Koster D, Hiatt WR, Amato A. A systematic review and meta-analysis of propionyl-L-carnitine effects on exercise performance in patients with claudication. Vasc Med 2013;18:3-12.
  10. Hiatt WR, Creager MA, Amato A, Brass EP. Effect of propionyl-L-carnitine on a background of monitored exercise in patients with claudication secondary to peripheral artery disease. J Cardiopulm Rehabil Prev 2011;31:125-32. PubMed
  11. Jacobs PL, Goldstein ER, Blackburn W, et al. Glycine propionyl-L-carnitine produces enhanced anaerobic work capacity with reduced lactate accumulation in resistance trained males. J Int Soc Sports Nutr 2009;6:9. PubMed
  12. Jacobs PL, Goldstein ER. Long-term glycine propionyl-l-carnitine supplementation and paradoxical effects on repeated anaerobic sprint performance. J Int Soc Sports Nutr 2010;7:35.

See these in context on the Propionyl-l-carnitine monograph →

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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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