ZM+ is an evolution of the classic formula (ZMA). Indeed, ZM+ is a considerable source of zinc, magnesium, and vitamin B6 (pyridoxine HCl).
XPN gives you more, including 5-HTP in its formula. 5-Hydroxytryptophan is a precursor to serotonin, which helps regulate sleep and alleviate insomnia.
Zinc is an essential element that contributes to the function of more than 300 enzymes within the human body. In men, it contributes positively to the production of testosterone.
Magnesium is an essential element that helps calm the nervous system. A nervous system at rest during deep sleep allows for the release of growth hormone.