oral glutathione supplementation evidence bioavailability randomized trial The clinical effect of on skin color... : Journal of Cosmetic Dermatology What does the evidence indicate

4 Prevalence, classification, and mechanisms of action of anabolicandrogenic substances Although a uniform classification of anabolicandrogenic substances (AAS) has not been formally established, in practice a functional division based on chemical structure, pharmacokinetics, and route of administration is commonly applied, as illustrated in Figure 1

Two reviewers independently evaluated the risk of bias

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