“Proven” is too weird a term. Most of those have promising studies showing benefits. For me, instead of looking for the “best”, I’d be looking to utilize ingredients that complement each other and/or work through different mechanisms to get the greatest benefit. That all said, you save a ton of time and money by just getting a good formula. Optimize T is terrific, you could also look into CEL MTest or ClomaPlex for T support. If you want the T boost specifically for muscle support, I’d check CEL Anabolic XT, it includes Cistanche and spilanthes for testosterone support as well as others for more direct anabolic action.