product features:

Formulated with natural antioxidants, its natural ingredients react with oxygen and sunlight to gradually darken grey hair to a dark brown. Visibly darkens hair within 2-4 weeks of use without artificial coloring, speed of color change may vary from person to person due to different hair textures. The container of this shampoo can achieve three-step oxygen barrier, maintain the activity of the formula, and is not easy to be oxidized.