Hair restoration company Viviscal has been sold by Irish businessman, James Murphy, for €150m.
He founded the Lifes2Good range of beauty products of which Viviscal was one of the brands.
It was spun out as a standalone brand in the last year.
US listed Church & Dwight is the buyer of Viviscal. The company is the owner of Arm & Hammer and Orajel toothpastes.
Viviscal products are sold at 25,000 outlets across the world.
They have been endorsed by several celebrities, including Jennifer Aniston and Reese Witherspoon, which saw sales taking off in the US market in particular.