Stellar CHelps heal wounds. Stellar C is a blend of vitamin C and plant based bioflavonoids known to help support the immune system. Although we immediately think of the immune system when it comes to vitamin C, this nutrient plays many other crucial roles in the body. One of them is to support the synthesis of collagen, which is one of the most abundant proteins in the body, and the main protein in bones, skin, tendons, ligaments and blood vessels.