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For instance, acute intake of LC (34 g) before exercise has been shown to enhance endurance performance in athletes by increasing running speeds at specific lactate thresholds and reducing heart rate responses [61]

4 L-Carnitine to Promote Heart Health: Research on the effects of this amino acid for those with heart concerns has focused on taking between one to three grams orally every day for up to 34 months

Expert Rev Clin Pharmacol

Regulatory feedback mechanisms leading to an increase in the dietary absorption of LC, and/or de novo synthesis may take place to overcome the LC deficiency and reduce the loss by urinary excretion