Not all testosterone supplements are equal. The 6 things that separate evidence-based products from marketing-driven formulas — with what to look for on the label.
When choosing a testosterone supplement, verify: KSM-66® Ashwagandha at 600mg (not generic extract at lower doses), transparent label with no proprietary blends, cGMP certified manufacturing, minimum 60-day money-back guarantee, and supporting ingredients at evidence-based doses (zinc, vitamin D, fenugreek).
The single most important criterion is whether the ashwagandha — if present — is KSM-66® at 600mg daily. KSM-66® at this specific dose has published double-blind RCT evidence for testosterone support. Generic ashwagandha at 150-300mg does not. This distinction is the biggest differentiator between evidence-based products and marketing-driven formulas.