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Does vitamin E supplementation increase the risk of prostate cancer?
The risk of prostate cancer was found to increase when vitamin E supplements were given for a long period.
JAMA (the Journal of the American Medical Association) published a study on the Selenium and Vitamin E Cancer Prevention Trial (SELECT) and concluded that “Dietary supplementation with vitamin E significantly increased the risk of prostate cancer among healthy men.”
Vitamin E in the form ‘Alpha-Tocopherol’ increases prostate cancer risk
The initial report of SELECT trial found no reduction in the occurrence of this carcinoma either with selenium (200 μg/d from L-selenomethionine) or with vitamin E (400 IU/d of all rac-α-tocopheryl acetate). However in the longer follow-up studies the occurrence of the malignancy in healthy SELECT subjects has established a relationship of this carcinoma with ‘all rac-α-tocopheryl acetate’.
The point to be noted here is that ‘all rac-α-tocopheryl acetate’ was the form of alpha-Tocopherol used in this SELECT trial. In fact vitamin E is a group of compounds which are fat-soluble and comprise four types of tocopherols and four types of tocotrienols. In natural food all the eight types are present in different proportions.
Alpha-Tocopherol constitutes the major source of vitamin E in European diets while in North American diet gamma-tocopherol is the major constituent. Though early research had focussed on alpha-tocopherol, of late the higher beneficial traits of gamma-tocopherol and tocotrienols are being recognized.
Vitamin E in the form of Tocotrienols has been found to help in prevention of cancer, reduction of cholesterol, protection from stroke-induced brain cell injury, lowering tumor formation, protection against DNA and cell damage and suppression of carcinoma of pancreas, breast, prostate gland and skin.
Vitamin E in the form ‘Gamma-tocotrienol’ is effective against prostate cancer
Recent studies by Luk Su et all have reported that vitamin E in the form of Gamma-tocotrienols (γ-T3) can be an effective therapeutic agent against the cancer stem cells (CSCs) and advanced stages of malignancy.
Alpha-tocopherol is found to interfere with tocotrienols benefits by interfering with their absorption and increasing their catabolism.
Synthetic alpha-tocopherol is produced and marketed as vit. E supplement whereas synthetic tocotrienol is not produced as a supplement though technically possible.
Further research in these lines and production and marketing of alternatives like Gamma-tocotrienols is required.
It can be safely concluded that vitamin E as ‘Alpha-Tocopherol’ increases the risk of this cancer while in its ‘Gamma-tocotrienol’ form can be an effective therapeutic agent against this malignancy.
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1.Image source: https://en.wikipedia.org/wiki/File:Diagram_showing_T1-3_stages_of_prostate_cancer_CRUK_278.svg
Image author: Cancer Research UK
Image license: https://creativecommons.org/licenses/by-sa/4.0/deed.en
2.Image source: https://en.wikipedia.org/wiki/File:Diagram_showing_prostate_cancer_pressing_on_the_urethra_CRUK_182.svg
Image author: Cancer Research UK
Image license: https://creativecommons.org/licenses/by-sa/4.0/deed.en
Current topic in Nutrition, Health & Wellness: Vitamin E and prostate cancer.