Maca is a root used by Peruvians to increase strength, stamina, energy, fertility and libido. It’s considered an adaptogen, a substance that counteracts or prevents disturbances to homeostasis brought on by stressors. Many use it to balance hormones naturally. Some small-scale clinical trials have shown maca may increase libido, improve semen quality and alleviate sexual dysfunction. It comes in capsules, or try the powder form in smoothies.