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The gap between recommended daily intake and what are considered safe upper limits (ULs) can be small. For example, for calcium the U.S. Food and Drug Administration set the recommended intake for adults over 70 years at 1,200 mg/day and the UL at 2,000 mg/day. [ 19 ]
Based on risk assessment, a safe upper intake level of 250 μg (10,000 IU) per day in healthy adults has been suggested by non-government authors. [ 5 ] [ 6 ] Blood levels of 25-hydroxyvitamin D necessary to cause adverse effects in adults are thought to be greater than about 150 ng/mL, leading the Endocrine Society to suggest an upper limit ...
Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A and selenium) that can be harmful in large amounts. This is the highest level of sustained daily nutrient consumption that is considered to be safe for, and cause no side effects in, 97.5% of healthy individuals in each life stage and sex group.
Under the act, supplements are regulated by the FDA for Good Manufacturing Practices under 21 CFR Part 111. [2] The act was intended to exempt the dietary and herbal supplement industry from most FDA drug regulations, allowing them to be sold and marketed without scientific backing for their health and medical claims.
The US National Academy of Medicine estimates upper limits for vitamins and minerals when evidence for a true limit is sufficient. For biotin, however, there is no upper limit because the adverse effects of high biotin intake have not been determined. [2] The EFSA also reviewed safety and reached the same conclusion as in the United States. [11]
Daily vitamin B 6 tolerable upper limits for adults as established by the agency Agency Upper limit Notes Reference National Health Service (NHS) United Kingdom 10 mg/day [44] Norwegian Scientific Committee for Food and Environment (VKM) 25 mg/day In 2017 VKM proposed to raise this to 25 mg/day, it was previously 4.2 mg/day. [40]
Many multivitamin formulas contain vitamin C, B 1, B 2, B 3, B 5, B 6, B 7, B 9, B 12, A, E, D 2 (or D 3), K, potassium, iodine, selenium, borate, zinc, calcium, magnesium, manganese, molybdenum, beta carotene, and/or iron. Multivitamins are typically available in a variety of formulas based on age and sex, or (as in prenatal vitamins) based on ...
The recommended daily allowance of zinc is 11 mg for older men and 8 mg for older women, with an upper tolerable limit of 25–40 mg per day, including both dietary and supplemental sources. However, individuals over 60 often consume less than 50% of the recommended zinc intake, which is crucial for proper body function.