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Step 2 in the Curl Definition Natural Hair Training System - Select Jar or Refillable Pouch
Dont layer copper peptides and harsh acids (Vitamin C, AHAs, or BHAs) in the same application
doi: 10.1016/j.nbd.2025.106953 144 ShiJLiZSunXYangYLuoYSongZet al
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