Bosley Professional Strength Thickening Fibers are keratin fibers that bond securely to existing hair to blend and cover thinning and low density areas of hair for instant volume, thickness and fullness.
It can help prevent dry, brittle hair by sealing in moisture and strengthening hair cuticles.
Keratin, cetrimonium chloride, dmdm hydantoin, silica.
Read the instructions carefully as mentioned on the Product Label.
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