Best Used Topically
Note: Retinol, the kind of vitamin A found in supplements and animal foods such as milk and liver, may actually weaken bones.
These findings are based on two separate studies and are consistent with each other. Therefore, ingesting a supplement is not recommended; however, Retinol is highly regarded in topical applications.
Vitamin A is required in the production of rhodopsin, the visual pigment used in low light levels. This is why eating foods rich in vitamin A is said to allow you to see in the dark.
Multivitamins and breakfast cereals were two of the largest sources of retinol, or vitamin A, though many brands get some of their vitamin A from beta-carotene.
Too much vitamin A can be harmful or fatal. Excess vitamin A has also been suspected to be a contributor to osteoporosis. This seems to happen at much lower doses than those required to cause an "overdose".
All retinoid forms of vitamin A are used in cosmetic and medical applications applied to the skin. In cosmetics, vitamin A derivatives are used as so-called antiaging chemicals -- vitamin A is absorbed through the skin and increases the rate of skin turnover, and gives a temporary increase in collagen giving a more youthful appearance.
Over-the-counter retinol, can improve lines and discoloration. Because retinol is gradually converted into retinoic acid (the active ingredient in the prescription creams) it is less potent. Retinol Cream is the best choice if you have normal to dry skin and are looking for a multi-purpose product.
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