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Instead of injecting testosterone directly (which shuts down your own production), peptides nudge your body to make more of its own preserving fertility, testicular size, and the natural feedback loop

it is increasingly evaluated through a metabolic lens

When food reaches the small intestine, it triggers the release of GLP-1, leading to a feeling of fullness, and stimulates the release of insulin, which lowers blood sugar

Norgaard CH, Friedrich S, Hansen CT, et al

This is explained because increased serum L-carnitine concentrations increase L-carnitine transport across skeletal muscle membrane and the neuromuscular junction

Carnitine can be transported by these transporters without OCTN2 in the liver