Fezinil is a natural female libido enhancement supplement that claims to dramatically increase women's desire for sex and lead to more intense and pleasurable orgasms. It works by ensuring the adequate balance of hormones and nutrients in the female sexual system. Common causes of low libido that Fezinil claims to address include lack of sleep, relationship issues, endocrine disruptors, certain medications, pregnancy/menopause, alcohol, smoking, and high stress levels.