Weight/Performance/Heart

L-Carnitine

Amino-acid-like compound that may modestly aid weight loss and reduce fatigue, especially in adults with low carnitine intake.

L-Carnitine

Amino-acid-like compound that may modestly aid weight loss and reduce fatigue, especially in adults with low carnitine intake.

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Caution

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Overview

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Safety

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Quick Take

Could be worth a trial for weight or fatigue if your diet is low in carnitine, but expect modest results.

L-carnitine is a nutrient-like compound made from lysine and methionine and found mainly in red meat, dairy, fish, and smaller amounts in poultry. It shuttles long-chain fatty acids into mitochondria and helps buffer acyl groups, which can support energy production when carnitine status or demand is suboptimal. Human trials suggest modest benefits for weight management, fatigue, and some cardiometabolic markers. It tends to help most in older adults, people with low meat intake, and those with overweight or metabolic issues.

Proven Benefits

Aids modest weight loss

Reduces fatigue in older adults

Improves angina symptoms

May reduce muscle soreness

May improve glucose control

May lower CRP and IL-6

May improve LDL/total cholesterol

Protocol

Amount

1-2 g

Frequency

Once daily or split into 2 doses

When

With meals; splitting doses can improve tolerance and may slightly improve retention.

Onset Time

4-8 weeks for fatigue/recovery; 8-12 weeks for weight or lab changes

Who Should Consider

Adults with overweight or central adiposity

Adults over 50 with low energy or poor recovery

Vegans and vegetarians with low dietary intake

People with insulin resistance tracking glucose

Adults with low red-meat intake

Food Sources

Beef steak (~80-100 mg per 100 g)
Pork loin (~20-30 mg per 100 g)
Cod or other white fish (~4-7 mg per 100 g)
Chicken breast (~3-5 mg per 100 g)
Whole milk (~8 mg per 250 mL)

How It Works

L-carnitine transports long-chain fatty acids across the mitochondrial membrane so they can be burned for energy. It also helps remove excess acyl compounds from mitochondria, which may improve metabolic flexibility and reduce cellular stress in some tissues.

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