The very best formulation of Vitamin C on the market today. Easily absorbed, less likely to cause gastric distress, conveniently packaged in both quantity and dosage, and available in capsules and tablets. The RDA for Vitamin C is far too low for the purpose of strengthening the body's immune system. Research this. I take 3-5,000 mg. of Ester-C daily, and despite my severe allergies and Asthma, I haven't had a cold in over 5 years, and only one Asthma attack in the previous 10 years! Get this, it works