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The material is produced by chemical synthesis and is provided as a white to off-white lyophilized powder at a purity of not less than 98% by HPLC, with lot-specific values, residual solvent notes, and mass-spectrometric identity confirmation reported on the accompanying Certificate of Analysis

The latter is often described as the active form and is the one used for supplementation purposes in reduced glutathione capsules

Ravna et al., 2009)

Even in strict vegetarian diets (as little as 1 mg/day exogenous carnitine for a 70 kg person), endogenous synthesis combined with the high tubular reabsorption rate is enough to prevent deficiency in generally healthy people