Collagen is often paired with other supplements depending on the health goal you want to achieve. Collagen supplements may have vitamin C added to them to help with skin health. If not, you can take a vitamin c supplement. Vitamin C helps your skin make more collagen. Collagen may be paired with biotin (vitamin B7) to help increase hair and nail growth. However, there isn’t any research to back up biotin’s effect on hair and nails. For joint health, collagen is often combined with MSM (methylsulfonylmethane), glucosamine, and chondroitin. These supplements have also been shown to benefit joint health.