ZMA is a natural mineral supplement made up of zinc, magnesium aspartate, and vitamin B6. Zinc supports your immune system and muscles. Magnesium plays a role in metabolism and muscle health and helps manage sleep. B6 may boost energy.
ZMA makers claim that increasing these three nutrients in your system can build muscle strength and stamina, speed muscle recovery, and improve the quality of your sleep.
But there’s not a lot of research to back that up.
In 2000, researchers gave ZMA supplements...