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Description
Effects of the insulin-like growth factor system on testicular differentiation and function: A review of the literature

Lipotropic B12 Injections: The Direct Route Lipotropic injections deliver a concentrated dose of B12 and other lipotropic agents directly into the bloodstream

Arch Toxicol Suppl 1980

You might consider a B12 shot if you follow a vegetarian or vegan diet, since B12 comes mainly from animal foods