Ester-C Magnesium 100 Caps from Nutricology/Allergy Research Group.Ester-C appears to have a high bioavailability. This formula contains magnesium ascorbate, is non-acidic and well tolerated by the bowel, with a pH of 7.0. Magnesium Ascorbate replaces Ester-C Magnesium, whose source material has been discontinued by its manufacturer. Magnesium ascorbate contains exactly the same amounts of elemental magnesium and ascorbic acid as Ester-C magnesium. It is a buffered, low-acidity form of vitamin C, which is less irritating to the stomach than ascorbic acid.

Ingredients
Serving Size : 1 Capsule
Ingredients Amount %DV
Vitamin C (as Magnesium Ascorbate) 500 mg
Calcium (as Calcium Ascorbate) 35 mg
Other Ingredients: Cellulose.

Suggested Use :
As a dietary supplement, 1 or 2 capsules one to three times daily between meals, or as directed by a healthcare practitioner. Ester-C may not be suitable for the severely allergic, as the vitamin C from which it is made is ultimately prepared from corn.