If you mean a Nitric Oxide Max supplement, its benefits depend on the ingredients, but products commonly contain ingredients such as L-citrulline, L-arginine, beetroot, or similar nitric-oxide-supporting compounds.
Potential benefits
Supports healthy blood flow and circulation
May improve exercise performance and endurance
May support muscle pumps during workouts
Supports cardiovascular function
May help exercise energy and recovery
Better circulation may support normal cognitive function
Some ingredients may support erectile function by improving blood flow