Sisu Ester-C 500 mg - Orange - Chewable tablets for those wanting to avoid swallowing pills. Helps in the development and maintenance of bones, cartilage, teeth and gums. Vitamin C also helps to reduce histamine release in the body, thereby alleviating allergy symptoms. There are numerous forms of vitamin C with ascorbic acid being the most basic. People wanting a clinically proven form that is easier on the system than ascorbic acid may choose a form like Ester-C brand calcium ascorbate.