Shop › Hair Strengthener Image 1 of 1 Hair Strengthener Sale Price: $15.00 Original Price: $20.00 This gel is made with Flaxseeds, Glycerin, Rosemary, Biotin, and Keratin. It is carefully formulated to strengthen hair. Quantity: Add To Cart Added! This gel is made with Flaxseeds, Glycerin, Rosemary, Biotin, and Keratin. It is carefully formulated to strengthen hair.