Vitamin C supplements contain vitamin C in the form of ascorbic acid, which has bioavailability that is equivalent to naturally occurring ascorbic acid in food products, such as orange juice and broccoli. Other forms of vitamin C supplements include sodium ascorbate; calcium ascorbate; other mineral ascorbates; ascorbic acid with bioflavonoids; and combination products, such as Ester-C, which contains calcium ascorbate, dehydroascorbate, calcium threonate, xylonate, and lyxonate.