collagen is the main structural protein in the: connective tissues, cartilages, bones, nails, derma and hair.

age aging anatomy anti beautiful beauty bone care cartilage chemical close collagen concept connective cosmetic degeneration degradation dermal dermatology dermis design detox diagram disease elastic elastin epidermis facelift female fiber fibril finger follicle grow hair hand health healthy helix human illustration join main medical medicine model molecule nail old older osteoporosis pain protein science section skin skincare structural structure tissu tissue treatment triple tropocollagen vector vitamin woman wrinkles young younger