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. Add To Cart Added! This gel is made with Flaxseeds, Glycerin, Rosemary, Biotin, and Keratin. It is carefully formulated to strengthen hair.