nih office of dietary supplements carnitine fact sheet acetyl-l-carnitine NOW Powder l-carnitine: Nutrition, pathology, and health
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Yes, glutathione is generally suitable for all skin types

Advances in metabolomics and analytical methodologies are improving our understanding of the interactions within fermented milk and the role of them in personalized nutrition and preventive health

In the first clinical study, a multicentre, randomised, double-blind, placebo-controlled, parallel-group study by De Grandis et al

Biol Psychiatry 2008;64:468-75

That means at least 12-16 weeks at or near the maximum tolerated dose
