L-Carnitine is a naturally occurring amino acid derivative that plays a critical role in energy production. It is found in various foods, particularly meat and dairy products, and is also synthesized in the human liver and kidneys from the amino acids lysine and methionine. The primary function of L-Carnitine is to transport long-chain fatty acids into the mitochondria so they can be oxidized—or "burned"—to produce energy. This process is essential for maintaining energy levels, especially in ti

How many studies on L-Carnitine are available?

NutriVouch references 364 human studies on L-Carnitine, all peer-reviewed and indexed on PubMed.

Is L-Carnitine effective for Fertility Support?

For Fertility Support, L-Carnitine has an effectiveness score of 5/10 — moderate evidence — works in some populations. Based on 29 relevant studies.

Is L-Carnitine effective for Weight Management?

For Weight Management, L-Carnitine has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 16 relevant studies.

Is L-Carnitine effective for Fat Metabolism?

For Fat Metabolism, L-Carnitine has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 11 relevant studies.

Is L-Carnitine effective for Heart Health?

For Heart Health, L-Carnitine has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 16 relevant studies.

Is L-Carnitine effective for Kidney Health?

For Kidney Health, L-Carnitine has an effectiveness score of 4/10 — weak or limited clinical evidence. Based on 10 relevant studies.

Confidence level

Strong evidence

364 studies

L-Carnitine

Absorption

✦Best absorbed on an empty stomach with water. Avoid taking it with a high-fat meal to prevent reduced absorption.

Daily Dose

⚖

Common dose: 500–2,000 mg daily.

RDA: No official RDA established.

Upper limit: Not established.

Best form: L-carnitine tartrate and acetyl-L-carnitine.

Timing: Can be taken with or without food.

Higher doses may be used under medical supervision for certain conditions. Consult a healthcare provider before use if pregnant, nursing, or have a medical condition.

Effects

Food Sources

Beef steak (cooked)95mg per 100g
Pork (cooked)27.7mg per 100g
Cod (cooked)5.6mg per 100g
Chicken breast (cooked)3.9mg per 100g
Whole milk8mg per 1 cup (240ml)