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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]
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]
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 ...
Biotin deficiency is a relatively uncommon condition, and the vast majority of people can get enough biotin (also known as vitamin B7) just from eating a well-rounded, balanced diet, per Healthline.
Biotin is part of the B vitamin family. Biotin deficiency rarely occurs among healthy people because the daily requirement of biotin is low, many foods provide adequate amounts of it, intestinal bacteria synthesize small amounts of it, and the body effectively scavenges and recycles it in the kidneys during production of urine.
Again, for those who don't have a diagnosed biotin deficiency, there's not enough evidence to support that biotin is the most effective method for hair growth. In general, biotin can "improve the ...