Resistance Range repairs weak hair & strengthen the hair fibers; with Biotin, a vitamin that stimulates hair growth and treats the strands from the inside out with rejuvenating power, making your hair strong, bright, soft & promoting hair growth. Bamboo fiber, rich in amino acids, works on the porous, sensitized and brittle hair strands to replenish amino acids, an essential building block in healthy hair. It also promotes water retention in the hair, ensuring hair’s hydration levels are improved.