21st Century C provides 250 mg of Vitamin C from ascorbic acid, buffered with 140 mg of calcium carbonate. This combination helps to neutralize some of the acidity of Vitamin C, potentially making it easier on the stomach for some individuals, though it's not a fully buffered ascorbate form.
Its main appeal lies in its extremely low price per serving, making it a highly accessible option for consistent daily intake of foundational Vitamin C and a small contribution of calcium. This product is well-suited for those seeking basic, budget-friendly supplementation.