Acetyl L Carnitine Side Effects | Odor, Stomach, Seizures

Effects01

What are the acetyl l carnitine side effects?

Acetyl l carnitine side effects include nausea, vomiting, cramps, diarrhea and a fishy body odor. The NIH fact sheet ties these to about 3 grams a day (NIH ODS, Carnitine).

Seizures02

Is acetyl-L-carnitine safe with seizure disorders?

No, carnitine can cause seizures in people with seizure disorders. Ask a neurologist before using it (NIH ODS, Carnitine).

Keep taking prescribed medicine and ask your doctor or pharmacist.

Seizure drugs that lower blood carnitine
Valproic acid	Phenobarbital	Phenytoin	Carbamazepine

Fit check03

Who needs a pharmacist's advice before taking it?

Anyone on seizure medicine, blood thinners or antidepressants should ask first.

Do you take a blood thinner such as warfarin, apixaban (Eliquis) or clopidogrel, or aspirin every day? Ginkgo may raise bleeding risk, and ginkgo with warfarin has been linked to more major bleeding. Ask the doctor who prescribed your blood thinner before you start, and keep every dose.

Do you take an antidepressant, birth control pills, or medicine for HIV, seizures, a transplant or the heart? St. John's wort can weaken or add to many of these. Some antidepressant combinations can raise serotonin to dangerous levels. Ask your doctor or pharmacist first.

Are you pregnant or nursing, or under 18? Ginkgo and St. John's wort are not advised in pregnancy, and the product is sold for adults. Do not start it without your doctor's advice.

Do you have a seizure disorder, a bleeding problem, thyroid disease or surgery coming up in the next two weeks? Acetyl-L-carnitine and ginkgo have seizure cautions, ginkgo is usually stopped before surgery, and bacopa may affect thyroid hormone. Talk to your doctor first.

Sudden confusion, trouble speaking, weakness on one side, a severe headache, or memory loss that is getting worse fast? Get emergency care now for sudden signs, and see a doctor soon for fast-moving memory change. These need a doctor, not a supplement.

Next step04

What is a sensible next step?

Read the ingredient page, then talk to a pharmacist.

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FAQ05

Carnitine safety questions

Why does carnitine cause a fishy smell?

The NIH fact sheet lists a fishy body odor among effects at about 3 grams a day (NIH ODS, Carnitine). It is a known effect at high intake, not a sign of spoilage. Tell a pharmacist if it bothers you.

Is there an upper limit for carnitine?

No upper intake level has been set, according to the NIH fact sheet (NIH ODS, Carnitine). That does not make high intake safe, since nausea and odor appear around 3 grams a day.

Did trials find more side effects than placebo?

In the Cochrane review of 16 trials, adverse events did not differ significantly from placebo (Cochrane, acetyl-L-carnitine). Trial doses and people differ from real life, so ask a pharmacist.

Who wrote this06

Written and reviewed by

Written byThe MemoPryl label deskMemoprylofficial, MemoPryl U.S. order-link partner

Pages built from the label, the official site, the sales page and linked NIH, FDA, FTC and peer-reviewed sources.

Medically reviewed byDr. Neelum Aggarwal, MD, PhysicianRole: Medical reviewerReview date: October 19, 2026

Last updated October 19, 2026. Find our editorial standards and how we check reviews. This website is run by a U.S. order-link partner, not by the maker of MemoPryl. This site earns a commission when you buy through our order links.

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