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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

They find that for the efficacy of l-carnitine on fasting plasma glucose (FPG), 2 g/day l-carnitine is required for at least 36.1 weeks

Long-term l-carnitine supplementation has demonstrated positive support for cardiovascular health after a 3-year follow-up in adult subjects