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Key considerations: Olfactory deposition: Particles 1030 m in diameter deposit optimally in the nasal cavity
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One study found that even up to 2,000 micrograms a day of methylcobalamin wasnt enough to correct vitamin B12 deficiency in one of three vegans tested
Typically, people start experiencing benefits 24-72 hours after treatment
Common effects usually mild and often worst during titration include nausea, vomiting, diarrhea, constipation, abdominal pain, upset stomach, headache, and fatigue
But "works" depends entirely on using it correctly
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