I was of the belief that all AAS shuts down endogenous test production 100%. I thought HCG didn't actually restore natural test production it just stimulates the leydig cells, does it actually cause the leydig cells to produce testosterone in the testes? But since the HT part of the HTPA axis isn't causing the LH production, wouldn't that mean that you're not really restoring any natural test production, just keeping your testicles full? Not that this doesn't help natural test restoration, but only by the fact that the testes are full enough to recieve it, instead of atrophied. Anyhow, I remember my endocrinologist saying that nothing but time brings back endogenous test production.