Pure Encapsulations Hair Skin Nails Ultra 60 CapsulesHair Skin Nails Ultra With Metafolin L 5 MTHF Promotes healthy hair, skin and nails Hair Skin Nails Ultra provides key building blocks and nutrients, such as biotin, zinc and silicon, to maintain skin elasticity and hydration, healthy hair, and nail resilience and thickness. Biotin, zinc and silicon are integral collagen and keratin cofactors, which regulate skin elasticity; optimal levels of these nutrients have been associated with healthy hair,