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Bovine Serum Albumin (BSA) is commonly used in cell culture protocols, particularly where protein supplementation is necessary and the other serum components are unwanted. In cell culture, it acts as a small molecule carrier.
Ascorbyl stearate (C24H42O7) is an ester formed from ascorbic acid and stearic acid. In addition to its use as a source of vitamin C, it is used as an antioxidant food additive in margarine (E number E305). The USDA limits its use to 0.02% individually or in conjunction with other antioxidants.