These products contain Zinc & Copper, vitamin B Complex with nicotinamide, C and A, all of which may contribute to normal function of the eyes.*
*Gilbert C. What is vitamin A and why do we need it? Community Eye Health. 2013;26(84):65. PMID: 24782580; PMCID: PMC3936685.
*O’Leary, Fiona; Samman, Samir. 2010. "Vitamin B12 in Health and Disease" Nutrients 2, no. 3: 299-316.