Effect of some heterocyclic compounds on human semen composition and biology

The effect of some heterocyclic compounds on some aspects of human semen metabolism was studied. Caffeine produced stimulation of motility and lactic acid production and an inhibition of fructose utilization and oxygen uptake. Nicotinamide and riboflavin produced stimulation of motility, fructose utilization and oxygen uptake and an inhibition of lactic acid production.