E306 corresponds to vitamin E of natural origin. It is a fat-soluble antioxidant. It mainly preserves fats, coloring materials and vitamins from alteration by oxygen.

Calcium ascorbate (E302) is a calcium salt of ascorbic acid, also known as vitamin C.

Sodium ascorbate is a potent antioxidant; it is widely used in the food industry for food preservation.

Ascorbic Acid, or oxo-3-gulofuranolactone, is an organic acid with antioxidant properties. It is present in an enantiomerically pure form in lemons, fruit juices, and fresh vegetables.

E309 is synthetic d-tocopherol (vitamin E). As a fat-soluble antioxidant, it mainly protects fats, coloring materials and vitamins from oxygen deterioration.