Viviscal® Professional 60ct Hair Nutrition Program Nourishes thinning hair and promotes existing hair growth from within. Viviscal® Professional helps nourish hair that is prone to breakage and shedding due to heat styling, coloring, extensions, and over styling. Viviscal® Professional supplements work in 4 stages over a 6 month period. A difference is often noticed in 2 to 4 months, in line with each individual patient's natural hair cycle. Clinically proven formula, 100% Drug Free. This is the strongest Viviscal on the market with 28% more of the active ingredient compared to extra strength.