How safe is it?

Product Description

Toppik Hair Fattener Advanced Thickening Serum (formerly Hair Fattener) revitalizes weak, limp and fine hair to boost a fuller, thicker appearance. Keratin nourishes and creates a protective barrier to help repair and prevent further environmental damage. Vitamin E enhances shine and moisturizes from root to shaft. Free of sulfates and safe for use on color-treated hair

Hang tight. We're thinking.