The Sweet Orange Ylang Ylang Argan Oil Shampoo & Conditioner Shampoo and Conditioner bars, Rosemary Cypress, Coconut Shea Butter or the Cedarwood Shampoo & Conditioner Bars would be best for gray hair. These are the most moisturizing bars we make. Helpful tip: repeat the conditioning process and/or leave the conditioner on the hair for a minute to penetrate the hair for a deeper conditioning effect.