# Carnitine and acetyl-L-carnitine

Source: https://onco.cc/technologies/carnitine-acetyl-l-carnitine/  
OnCo record `carnitine-acetyl-l-carnitine` (Technology). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Acetyl-L-carnitine was tested to prevent nerve damage from chemotherapy and made it worse, with the extra damage still present two years later; guidelines advise against it. Plain L-carnitine for cancer fatigue has mixed results and guidelines do not recommend it either.

## Summary

Memorial Sloan Kettering's About Herbs entry reports that in cancer settings acetyl-L-carnitine increased chemotherapy-induced peripheral neuropathy, an effect that persisted at two-year follow-up, and that current guidelines do not recommend it for preventing neuropathy. For L-carnitine, small oncology studies suggest improved nutritional status and quality of life in pancreatic cancer, fewer muscle spasms with vismodegib, and less chemotherapy-related fatigue alone or with coenzyme Q10, but a trial found no improvement in fatigue in people with invasive cancers and current guidelines do not recommend L-carnitine for cancer-related fatigue. Carnitine deficiency does occur with malnutrition, malabsorption and dialysis, and whether chemotherapy-induced carnitine insufficiency contributes to fatigue is unresolved. Side effects are usually mild (indigestion, a fishy body odour at high doses); MSK notes that L-carnitine may add to the anticoagulant effect of warfarin. Exercise and the approaches graded strong for fatigue are better supported.

## Fields

- Kind: Technology
- Status: negative
- Last checked: 2026-11-04
- Also known as: L-carnitine; Acetyl-L-carnitine; ALCAR
- Tags: complementary; supportive-care; evidence:harm
- Principle: Carnitine carries long-chain fatty acids into mitochondria for energy; the acetyl form crosses into the nervous system, where the expected protection did not appear in trials.
- Strengths: Correcting true deficiency (for example on dialysis) is reasonable; Small signals in pancreatic cancer nutrition
- Limitations: Acetyl-L-carnitine worsened chemotherapy neuropathy in a trial, lasting two years; Not recommended by guidelines for fatigue or neuropathy; Possible additive effect with warfarin

## Sources

- MSK About Herbs: Carnitine (page last updated 15 October 2026): https://www.mskcc.org/cancer-care/integrative-medicine/herbs/carnitine

## Connected records

- technologies: [Alpha-lipoic acid](https://onco.cc/technologies/alpha-lipoic-acid/), [Creatine supplements](https://onco.cc/technologies/creatine-supplements/), [Dietary supplements during cancer treatment: interactions and harms](https://onco.cc/technologies/dietary-supplements-treatment-interactions/), [Evidence-based integrative oncology](https://onco.cc/technologies/integrative-oncology/), [Fatigue after cancer treatment: what actually works](https://onco.cc/technologies/cancer-related-fatigue-management/), [HMB (beta-hydroxy-beta-methylbutyrate)](https://onco.cc/technologies/hmb-supplements/), [Nerve damage from chemotherapy: what recovers, and what helps](https://onco.cc/technologies/cipn-recovery-and-treatment/)
- fronts: [Chemotherapy](https://onco.cc/fronts/chemotherapy/), [Diet, Exercise & Lifestyle](https://onco.cc/fronts/nutrition-lifestyle/), [Supportive Care & Survivorship](https://onco.cc/fronts/supportive-care/)
- drugs: [Vismodegib](https://onco.cc/drugs/vismodegib/)
- terms: [Peripheral neuropathy (chemotherapy-induced)](https://onco.cc/terms/peripheral-neuropathy/)
- bottlenecks: [Toxicity and quality of life are undervalued](https://onco.cc/bottlenecks/b-toxicity-qol/)

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