Doctor’s Best Collagen Types 1&3 supports hair, skin, nails, tendons, ligaments and bones. It also supports joint comfort, mobility and quality of life. Collagen is the major structural protein in the body's joints. Doctor’s Best Collagen Types 1&3 contains pure collagen protein enzymatically hydrolyzed into component amino acids for optimal utilization by the body. Doctor’s Best makes Collagen Types 1&3 in tablet, capsules and powder.Gluten and Soya free.