Kirkland Signature Vitamin C is a high-potency nutritional supplement. In addition to Vitamin C, it also contains a citrus complex of bioflavonoids, which may assist in the body's absorption of Vitamin C, and rose hips, which are a natural source of Vitamin C. Vitamin C is an essential daily vitamin and has many important functions in the body.

Vitamin C is considered one of the key building blocks in the body. For example, Vitamin C is required for the synthesis of collagen, as well as other substances in the body. Collagen, in turn, supports connective tissue health, and that includes the health of teeth, gums and bones. So, Vitamin C, directly and indirectly supports many areas of good health in the body.