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Phase Moderate range Daily dose 40-80 mcg/day Frequency Once daily Notes Diminishing returns commonly reported above ~50-60 mcg/day

Check out this paper from 1992: If the indiscriminate dumping of industrial cyanide waste continues unchecked with the inherent risk of pollution of food and water supplies there may well come a time when more widespread chronic cyanide neurotoxicity occurs in the Western hemisphere from a dietary source in persons with a genetic or acquired error of cyanide or vitamin B12 metabolism

But many people especially vegetarians, vegans, or those with gut or absorption issues dont get enough

The Clinical Global Impressions-Improvement (CGI-I) score, which measures Autism Spectrum Disorder symptoms, was the main measurement used

Tudor, M., Jandric, I., Marovic, A., Gjurasin, M., Perovic, D., Radic, B., Blagaic, A