This multi-type blend covers more ground than a single-source collagen: types 1 & 3 for skin and hair, type 2 for cartilage, type 5 for hair follicle and bone matrix support, and type 10 for cartilage health. NutraBio is known for third-party-tested, no-proprietary-blend formulas, so what's on the label is what's in the tub.