Natures Aid Collagen Joint Formula with Vitamin D3 & Zinc, plus Copper, Manganese & Vitamin C has been specially formulated using hydrolysed pure marine collagen (Type II). Natures Aid®Collagen Joint Formula combines a number of carefully selected nutrients. The product also contains: Vitamin D3 and Zinc: to help maintain normal bones. Copper and Manganese: which help in the maintenance of normal connective tissue. Vitamin C: which supports normal collagen formation, for the normal function of cartilage.