Yamamoto Vitamin A 1200mcg
Vitamin A contributes to the normal function of the immune system and to the maintenance of normal skin and vision.
Science understands the role of vitamin A above all in relation to its effects on the visual apparatus. The human retina has four types of photo pigments containing vitamin A: rhodopsin, present in the rods (retinal cells responsible for night vision), and three iodopsins, present in each of the different cones responsible for day vision (blue, yellow and red ).
When there is a flash of bright light (such as the lights of the car's headlights), a temporary discoloration of the rhodopsin occurs. It may take a few seconds before retinal regeneration and vision return occur. If vitamin A levels are low, a longer adaptation time is needed. Bad adaptation to changes in brightness and poor night vision are some of the initial symptoms of vitamin A deficiency