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L-Carnitine

19 results

Products

What is L-carnitine?

L-carnitine is a compound your body makes from the amino acids lysine and methionine, and that you also get from red meat and dairy. Its job is transporting long chain fatty acids into the mitochondria, the part of the cell where fat is burned for energy. That transport role is why it is marketed for fat loss.

The honest position is that the mechanism is real but the supplement effect in healthy people is modest. Muscle carnitine levels in well fed adults are already close to saturated, and raising them through oral supplements is slow, needing weeks of consistent intake and generally working better when taken alongside carbohydrate. Acetyl L-carnitine crosses into the brain more readily and is sold for focus rather than fat loss.

Why shop L-carnitine at Supplement Mart?

  • 47 L-carnitine products in stock, in liquid, powder and capsule form
  • 58 stores nationwide, with click and collect available
  • Free shipping Australia-wide on orders over $150, with no surcharges
  • East and west coast dispatch on orders placed before 2pm on weekdays
  • Supplement Mart Rewards, earning points on every dollar spent
  • An in-house nutritionist you can actually ask a question

How it is usually used

Label doses commonly sit between 1 and 3 g a day. Taking it with a carbohydrate containing meal is the usual advice, since insulin assists muscle uptake. Consistency over weeks matters more than timing around a session. Supplements are not a substitute for medical advice. If you are pregnant or breastfeeding, take prescription medication, or are managing a health condition, check with your doctor or pharmacist before starting something new.

Frequently asked questions

Does L-carnitine burn fat?

It is required for fat to be transported into cells and burned, so the mechanism is genuine. Whether supplementing increases fat loss in healthy adults is a different question, and controlled trials have generally shown small or inconsistent effects. It is not a substitute for an energy deficit.

What is the difference between L-carnitine and acetyl L-carnitine?

The acetyl form crosses the blood brain barrier more readily, so it is sold for mental focus and cognition rather than for fat metabolism. Plain L-carnitine, and L-carnitine L-tartrate, are the forms used in exercise and recovery contexts.

Should I take it with carbohydrate?

That is the usual recommendation. Muscle uptake of carnitine appears to depend on insulin, so taking it with a carbohydrate containing meal rather than on an empty stomach is the more sensible approach.

Do vegetarians need more carnitine?

Vegetarians and vegans take in less, since the main dietary sources are red meat and dairy. The body also makes its own, so deficiency is uncommon in healthy people. If you eat no meat, carnitine is one of the more defensible supplements in this category for you.

How long before it does anything?

Weeks. Raising muscle carnitine is a slow process, and studies showing changes have typically run for twelve weeks or more of daily use. Nothing useful happens on day one.

Sources

Last reviewed: 10 October 2026