Ester-C is the world's best-selling vitamin C supplement, and for good reason. It stays in your body's cells for 24 hours, meaning you only need to take Ester-C once a day to make sure your body has the protection it needs.

The star of our unique and exclusive Ester-C formulation is calcium ascorbate, and the brand was discovered in the early 80s, when its developer, a curious doctor and scientist began the search for the first acid-neutral and stomach-friendly vitamin C. After much research, Ester-C became known as "The better vitamin C" due to its proven and effective support of the immune system.

Ester-C is made acid-neutral, which means it has a neutral pH. In a recent clinical trial(, people who are normally sensitive to acidic foods were given either Ester-C or ascorbic acid. The results showed that those given Ester-C did not experience discomfort with acid in the stomach.

These days, many people are concerned about avoiding the consumption of foods/nutrients that are GMO produced. Our Ester-C® is of course GMO-free, and certified to the FDA's highest standards.