An amino acid compound that helps convert fats into cellular energy for exercise recovery and stamina.
What it is
L-Carnitine is an amino acid forms naturally produced in your body and stored in your muscles. It acts like a shuttle bus, carrying fatty acids into your muscle cells' powerhouses (mitochondria (the tiny power stations inside your cells)) where they are burned for fuel. L-Carnitine L-Tartrate is a fast-absorbing form popular in exercise formulas.
Also known as: L-Carnitine L-Tartrate, Levocarnitine, Acetyl-L-Carnitine
Key benefits
- Shuttles fatty acids into cells to be burned as energy.
- Eases muscle soreness after exercise, so you recover faster.
- Supports endurance and physical stamina during workouts.
Amplified by probiotics
L-Carnitine is absorbed in your small intestine. Friendly probiotic bacteria support healthy gut bacteria, ensuring L-carnitine is absorbed cleanly through the gut wall. This helps your body make full use of L-carnitine for muscle energy while maintaining a balanced digestive tract.
Typical dose
1,000–3,000 mg/day (L-Carnitine L-Tartrate)
The evidence
Evidence: strongHuman research shows that taking L-carnitine reduces post-workout muscle soreness and aids physical recovery (Fielding et al. 2018, Nutrients; Talarez et al. 2020, Clin Nutr ESPEN).
- Fielding R, et al. L-Carnitine Supplementation in Recovery after Exercise. Nutrients. 2018;10(3):349. PubMed ↗
- Talarez M, et al. The effect of L-carnitine supplementation on lipid profile in adults: a systematic review and meta-analysis of randomized controlled trials. Clin Nutr ESPEN. 2020;36:1-11. PubMed ↗
Safety & who should check first
Very well tolerated at standard doses (1–3 g per day). Doses over 5 g may cause mild stomach upset. Safe for daily physical and athletic support.