The secret’s out! Celebrities and expert stylists revealed their weapon to maintaining strong and healthy hair and name Viviscal Extra Strength as their must-have for achieving and maintaining red carpet worthy hair. As the leading hair growth program celebrating its 25th anniversary, the brand is branching out with some new products too.   Gwyneth Paltrow swears by a steady supply of Viviscal hair growth supplements. “It beyond works. I want to buy stock in that company,” she commented.    ...