Pure Encapsulations Hair Skin Nails Ultra - This product contains essential building blocks and nutrients like biotin, zinc, and silicon to promote skin elasticity and hydration, as well as healthy hair and strong nails. These ingredients act as vital collagen and keratin cofactors, aiding in the regulation of skin elasticity. Adequate levels of these nutrients have been linked to the overall health of skin, hair, and nails. Additionally, zinc supports immune function in the skin, while biotin has been shown in clinical studies to strengthen and thicken the keratin structure of nails. Vitamin C and copper are also crucial in the formation and repair of connective tissue. As an added benefit, vitamin C helps with collagen formation and counteracts oxidative stress, along with the sustained release CoQ10 complex.