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However, they experience a decrease in endogenous testosterone production owing to AAS use, which manifests, among others, as erectile dysfunction and spermatogenesis suppression, resulting in testicular atrophy, and infertility

Hydroxocobalamin is the preferred B12 formulation in the UK due to its longer duration of action compared to cyanocobalamin
NNMT is an enzyme involved in nicotinamide metabolism and energy-related pathways
