Maca (Lepidium meyenii) is a Peruvian root grown at 4,000m. A 2002 randomized trial in men aged 21–56 found improved sexual desire at 8 and 12 weeks versus placebo, with no change in testosterone or estradiol.
Unknown, but likely involves macamides acting on the endocannabinoid system rather than sex hormones.
Effects appeared at 8 weeks, not 8 days. This is why we recommend 30–60 days of Maxorin before judging.