According to the product label, Male Onyx may work to increase supplies of both total and free testosterone. It may also contribute to decreased body fat, potentially providing a boost in overall energy levels and enabling faster weight loss. An important potential benefit is its promise to fuel muscle growth quickly, safely and utilizing all-natural ingredients. When used alongside a healthy diet rich in proteins and a regular exercise routine, the manufacturer promises increasing fitness results with consistent use. It may also support an increase in basal metabolic rates due to the energy-raising extracts in its formula, thus helping users to burn more fat while at rest (in addition to potentially raising workout performance).