L-Arginine
Well-studied — a semi-essential amino acid the body converts toward nitric oxide.
Horny Goat Weed
Traditional use, limited modern research — treat bold claims about it cautiously.
Ashwagandha
Well-studied — an adaptogen with one of the stronger research bases in this category.
Maca Root
Traditional use, growing research — still more limited than ashwagandha's evidence base.
Korean Red Ginseng
Traditional use, moderate research — including some studies on circulation-related support.
