Testagen is a fascinating peptide that can increase both Testosterone and Thyroid hormone levels. It does so through direct action on the pituitary gland (where it stimulates the production of LH & FSH which cause the testicles to produce more Testosterone & sperm), and by indirectly stimulating the thyroid gland to produce more TSH (which leads to higher T3 & T4 levels).
I personally see this peptide becoming a useful tool in a PCT context not just after SARM & AAS cycles, but also after Thyroid hormone cycles since it also appears to kickstart the endogenous production of TSH (something that using exogenous thyroid hormones suppresses).
Testagen also appears to be able to interact with DNA to improve immune function, and there is some evidence to suggest that it can also prevent blood clotting.
Testagen is pretty hard to find as of early 2025. I would not recommend purchasing it from any company besides the ones below, unless you want to get scammed or potentially get something else labeled as Testsagen.
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