Each quick-dissolving tablet of CircO2 provides the body with the three major nutrients known to boost nitric oxide levels. Besides this proprietary nitric oxide blend, some other ingredients available from CircO2 are Vitamin B12, Vitamin C, and magnesium. Each tablet provides 1000 micrograms of vitamin B12 that is required for enhancing the levels of nitric oxide and proper functioning of the brain, nerves, and muscles.The powerful antioxidant Vitamin C is also recognized for improving levels of the miracle molecule nitric oxide by stimulating an enzyme vital for its production. Additionally, magnesium present in CircO2 allows blood to flow more freely as it relaxes muscles in the arteries.