You don't need a synthetic hormone. You don't need to inject anything.
For centuries, men in Japan and across Asia supported their vitality with food, not chemicals. Soft-shell turtle. Black ginger. Oysters. Roots from the mountains. Foods valued for one thing: keeping a man strong as he aged.
Modern diets dropped almost all of them. We eat more than ever, but much less of what our grandfathers relied on.
The good news: those same traditional ingredients are still available. Most men just never heard of them.