L-Carnitine Capsules, 500 mg

L-carnitine helps transport long-chain fatty acids into mitochondria, where they can be used in energy metabolism. Each serving provides 500 mg of L-carnitine, in capsules.

• 500 mg of L-carnitine per serving
• Supports normal fatty-acid transport and energy metabolism*
• Form and elemental L-carnitine amount stated clearly
• No "fat burner" positioning
• Independent testing for documented quality attributes

Not yet in stock. The page is published ahead of the product. Capsule count per bottle and final label directions will be added here before it goes on sale.

What L-carnitine does

Carnitine is required for transporting long-chain fatty acids into mitochondria. Your body makes it from lysine and methionine, and you also take it in from food, mostly red meat.

Healthy people generally synthesise enough carnitine, so a mechanistic role does not mean supplementation benefits everyone. That distinction matters more here than in most of this range, because carnitine's mechanism is genuinely well established while the case for supplementing it in healthy adults is not.

Form matters, and it is not a detail

L-carnitine, L-carnitine L-tartrate, propionyl-L-carnitine and acetyl-L-carnitine are not interchangeable labels. They have different absorption profiles and separate bodies of human research, and evidence generated on one form does not transfer to another.

This product is L-carnitine at 500 mg per serving. We are not going to borrow findings from acetyl-L-carnitine trials, which mostly look at cognition, or from propionyl-L-carnitine trials, which mostly look at circulation, and present them as though they apply here. They do not.

What human research shows

Research on athletic performance and weight-related outcomes is mixed. We are not going to position L-carnitine as a fat burner, a weight-loss treatment, or a guaranteed endurance enhancer, because the human evidence does not support any of those.

Its strongest defensible story is the one above: a normal role in fatty-acid transport and energy metabolism. That is a smaller claim than the category usually makes, and it is the one that survives scrutiny.

How to use it

Final directions will be published with the label. Two things are worth knowing in advance. The NIH Office of Dietary Supplements notes that absorption from supplements is lower than absorption from food, and that doses around 3 grams a day can cause gastrointestinal effects or a fishy body odour in some people. A 500 mg serving sits well below that threshold.

Common questions

Does L-carnitine burn fat?
L-carnitine participates in fatty-acid transport, but that mechanism does not prove meaningful fat loss from supplementation. We do not market it as a fat burner.

What is the difference between L-carnitine and acetyl-L-carnitine?
They are different forms with different research contexts. Acetyl-L-carnitine crosses into the brain more readily and most of its research looks at cognition. This product is L-carnitine, and the page reflects the research on that form.

Do healthy adults need L-carnitine?
Most healthy adults synthesise carnitine. Whether supplementation is useful depends on diet, health and goals. People eating little or no red meat have lower dietary intake, which is the clearest case for considering it.

What side effects are possible?
Higher supplemental amounts may cause nausea, vomiting, abdominal cramps, diarrhoea, or a fishy body odour. Follow the label and seek medical advice for persistent symptoms.

Are there medication considerations?
Carnitine can be relevant to certain medications and medical conditions. People using valproic acid or other prescription medicines should ask a clinician or pharmacist before use.

Read more

Mitochondrial health supplements · Testing and quality · How we evaluate evidence

*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.