Nature's Bounty Optimal Solutions Hair Growth with Advanced Hair Complex is clinically shown to help grow thicker, fuller hair in just three months.* As we age hair follicles can change, making hair appear less thick and healthy. From the #1 Brand For Hair, Skin & Nails , Nature's Bounty Optimal Solutions Hair Growth contains ADVANCED HAIR COMPLEX with vital nutrients that nourish the hair follicles to help grow thicker, fuller hair.* Advanced Hair Complex contains Biotin, Silicon and Arginine, which provide structural support for existing hair growth and increased thickness in a convenient one-per-day formula.