Explore vitamin C products by their exact ingredient descriptions and serving information. Ester-C with citrus bioflavonoids offers one capsule example to compare with another explicitly identified vitamin C formula. Check the amount per labeled serving and the additional ingredients on each panel. A different vitamin product may appear nearby, but the word vitamin alone does not establish vitamin C content or an equivalent preparation.View Ester-C with Citrus Bioflavonoids – Non-Acidic Form of Vitamin C – 500 MG (120 Capsules).