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are there different types of l-carnitine — Jo Mar Labs Liquid L-Carnitine 3000: Metabolism &
Description
A review of the medical examination data from 25 autistic children found that 53% of these patients had increased pyruvate levels, 76% had elevated blood lactate, in 20% of them the lactate/pyruvate ratio in fibroblasts was increased, and 42% were presented with atypical results of urine organic acid analysis [72]

BMC Genomics

The recommended dosage can vary depending on the form of L-Carnitine and the intended use

Many users prefer taking their L Carnitine dosage before breakfast or pre-workout for faster absorption