Rex - Tablet Betacarotene + Vitamin C + Vitamin E - 6mg+200mg+50mg 30 Tablet(s) / Box Square Pharmaceuticals PLC. Indication: Alzheimer's disease, Cancer Prevention, dementia, degenerative diseases, coronary heart diseases, end stage renal disease, growth and repair of body tissue, bone, skin, teeth and hair. Adult Dose: 1 tablet/capsule daily. Contraindication: Patients with a known hypersensitivity to any of the ingredients. Mode of Action: Beta carotene is 1 of a group of red, orange, and yellow pigments called carotenoids; Dietary sources include fruits, vegetables, and whole grains. Photoprotective effects: Exact mechanism unknown; in vitro studies suggest antioxidant effects and that beta carotene reduces free radicals and singlet oxygen, which are produced when porphyrin is exposed to light and air. Vitamin C is necessary for collagen formation and tissue repair; plays a role in oxidation/reduction reactions as well as other metabolic pathways including synthesis of catecholamines, carnitine, and steroids; also plays a role in conversion of folic acid to folinic acid. Vitamin E plays a... Precaution: Hypervitaminosis. Avoid use in early pregnancy. Patients on anti coagulant therapy should not use ascorbic acid prolonged period of time. Side Effect: Generally, this preparation is well-tolerated. Diarrhea may occasionally occur during treatment with beta carotene and the skin may assume a slightly yellow discoloration. The side-effects of vitamin A are reversible. Vitamin C and vitamin E may cause diarrhea and other gastrointestinal disturbances.