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The Vegan Society recommends fortified foods three times a day, or a 10 microgram daily oral supplement, or a 2,000 microgram weekly oral supplement
This concern mainly applies to people taking high doses of biotin, typically in the range of many milligrams per day (far above the normal dietary amount)
(PubMed) Levy AP, Friedenberg P, Lotan R, et al
To understand why this happens, we have to go to the synaptic cleft, or the connection between neurons
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