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However, low vitamin B 12 status in combination with high folic acid intake, in addition to the previously mentioned neuropathy risk, appeared to increase the risk of cognitive impairment in the elderly. [105] Long-term use of folic acid dietary supplements in excess of 1,000 μg/day has been linked to an increase in prostate cancer risk. [13]
Folic acid is a synthetic derivative of folate and is acquired by dietary supplementation. [25] Multi-vitamin dietary supplements contain folic acid as well as other B vitamins. Non-prescription folic acid is available as a dietary supplement in some countries, and some countries require the fortification of wheat flour, corn meal or rice with ...
Folinic acid should be distinguished from folic acid (vitamin B 9). However, folinic acid is a vitamer for folic acid and has the full vitamin activity of this vitamin. Levofolinic acid and its salts are the 2S-form of the molecule. They are the only forms of the molecule that are known to be biologically active.
In the United States, a multivitamin/mineral supplement is defined as a supplement containing three or more vitamins and minerals that does not include herbs, hormones, or drugs, where each vitamin and mineral is included at a dose below the tolerable upper intake level as determined by the Food and Drug Board, and does not present a risk of ...
The elderly and athletes may need to supplement their intake of B 12 and other B vitamins due to problems in absorption and increased needs for energy production. [ medical citation needed ] In cases of severe deficiency, B vitamins, especially B 12 , may also be delivered by injection to reverse deficiencies.
Dr. Michael Roizen is 78 but says his biological age is 57.6. Roizen, who has written about longevity, takes supplements every day. They include multivitamins and aspirin.