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Certain gut-derived peptides (such as GLP1 analogs) indirectly elevate testosterone by reducing body fat, improving insulin sensitivity and lowering aromatase activity, which preserves testosterone

What decides the answer is what you actually want to change not which procedure is more popular

Im gonna try add some foods from @Hannah s list to my diet too

While correlation does not equal causation, the parallel decline of a regenerative peptide and the onset of hair thinning is biologically plausible and suggests that topical GHK-Cu supplementation could compensate for what the body no longer produces in sufficient quantities

Berberine hydrochloride-loaded dung beetle chitosan/sodium alginate microspheres ameliorate DSS-induced colitis and regulate gut microorganisms in mice