Nature's Plus Ultra Skin, Hair and Nail 60 tablets. Rich in vitamins, minerals, amino acids and other substances that promote hair care from the inside, supporting the synthesis of collagen and other proteins. The L-cysteine and L-methionine, a key role in the formation of disulfide bonds that lead to hair keratin. Methylsulfonylmethane (OptiMSM ®) provides highly bioavailable organic sulfur, which together with vitamin C, glucosamine sulfate and zinc elements involved as precursors and catalysts for the synthesis of collagen. Horsetail is a natural source of silicon. Silicon is particularly suitable to increase strength and elasticity of hair. msm 1000mg. Vitamin C-120mg. L-proline-50mg. calcium 44 mg.