Carnitine Supplements

Carnitine supplements, most often sold as L carnitine or acetyl L carnitine, are marketed for exercise recovery, energy and fat metabolism, and they come as capsules, liquids and powders. The body makes carnitine and gets it from meat and dairy, and research on supplements for weight loss and performance shows mixed results, so the first decision is whether to try it, ideally after talking to a doctor.

Form is the next question. L carnitine tartrate is common in sports products, acetyl L carnitine is often marketed for brain health, and liquid forms are flavoured and easy to dose. Compare the amount of carnitine per serving and the number of servings.

Safety and side effects come next. Carnitine can cause stomach upset and a fishy body odour at high doses, and it may interact with thyroid medicines and blood thinners. People with kidney disease or a history of seizures should ask a doctor first.

Quality varies, so look for independent laboratory testing, especially for athletes in tested sports, and check that the product does not contain added stimulants.

Before buying, check the carnitine form, the dose per serving, the servings, the other ingredients and the testing information. Store the product as the label directs, and stop if you notice side effects. Carnitine is often found in pre workout and fat burner blends alongside caffeine and other stimulants, so read labels carefully if you are sensitive to caffeine.

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