Each tablet combines three actives that address male pattern hair loss in different ways. Minoxidil widens the small blood vessels supplying the follicle and keeps hair in its active growth phase longer. Finasteride blocks 5-alpha-reductase, the enzyme that converts testosterone into DHT — the hormone that shrinks follicles in men with genetic hair loss. Biotin is a B vitamin the body uses to make keratin, the structural protein of the hair shaft.