Phosphate Ester Sodium serum is a serum formula containing sodium ascorbyl phosphate. Eucerin Sodium Calcium Ascorbyl Phosphate is a vitamin C derivative with antioxidant and anti-inflammatory properties. Sodium Ascorbyl Phosphate serum is often used to treat vitamin C deficiency and related conditions such as scurvy and scurvy gingivitis. In addition, Sodium Ascorbyl Phosphate Eucerin serum can also be used to improve skin texture and reduce signs of skin aging.