The 7 Day Scalp and Hair Challenge is underway, as supermodel-turned-television-host Heidi Klum promotes Unilever’s Clear Scalp and Hair Beauty Therapy product line.

“In addition to daily styling, my hair is colored often which is tough on my scalp and hair,” said Klum. Klum said that after using the brand’s Damage & Color Repair shampoo and conditioner for seven days, her hair was in better shape.

Klum She added, “Because of these amazing results, I’m asking women everywhere to join me in the 7 Day Scalp & Hair Challenge, so they can experience it for themselves.”

The promotion is being run in conjunctuon with a contest on Facebook. Unilever is giving seven fans $500 in products.