Use a Clarifying Shampoo to Start With Super-Clean Hair Instead of standard shampoo, swap in a scalp-treating alternative like the Christophe Robin Thickening Shampoo Paste with Rassoul Clay for Men ($53). It features clay (to absorb impurities and oils) along with algae (to naturally strengthen hair), and helps build volume over time, too. Image Source: sephora.com Christophe Robin Thickening Shampoo Paste with Rassoul Clay for Men $53 from sephora.com Buy Now