Vitamin A, vitamin B2 (riboflavin), zinc and the omega-3 fatty acid docosahexaenoic acid (DHA) contribute to the maintenance of normal vision.
The effect is noticeable with a daily uptake of 250 mg DHA.
Vitamin C, vitamin E, zinc and selenium contribute to the protection of cells from oxidative stress. Zinc contributes to normal carbohydrate metabolism.
Vitamin B1 (thiamine) contributes to normal energy-yielding metabolism.
Vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B6, vitamin B12, vitamin C, biotin and niacin contribute to normal functioning of the nervous system (including the optic nerve).