Mixed carotenes found in food sources can protect against
cancer, heart disease (atherosclerosis), may slow the progression of
cataracts and help protect against macular degeneration, and may also
slow the progression of osteoarthritis.
Sources
Dark green and yellow vegetables: carrots, sweet potatoes, squash,
spinach, romaine lettuce, broccoli, apricots, and green peppers.
Therapeutic dosage
3 mg daily (5000 IU)
Beta-carotene is a more safe way to supplement vitamin
A, 1 IU of beta-carotene = 1 IU of vitamin A, but 1 mg of
beta-carotene = 500 mcg of vitamin A. In pregnancy, supplementation
should be in the form of beta-carotene.
Safety concerns
Very safe at recommended doses. Preferred way to supplement vitamin A.
Interactions
If you are taking colestipol or cholestyramine, you may need more
beta-carotene. You may have trouble absorbing beta carotene if you
are taking colchicine or methotrexate.