eek Deep Conditioning Biotin Gel with Peppermint, Elastin & Keratin features a potent blend of Biotin to help improve tensile strength. Mill Creek Deep Conditioning Biotin Gel penetrates the hair shaft to nourish and replenish important nutrients for healthy hair growth. Mint Oil gives scalp a tingling, invigorating sensation. Paraben-Free. SLS/SLES-Free.