Andrew Huberman· PhD
Nonetheless, there are studies that point to specific substances that are sold over the counter that at least in the United States are legal and that have been shown to be statistically significant in increasing measures of libido. There are many such substances, but three that in particular have good peer-reviewed research to support them are Maca, M-A-C-A, which is actually a root. Tongkat Ali, also sometimes called longjack, I didn't name them, forgive me, and Tribulus, or Tribulus, it's sometimes called.