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AOD-9604 has an extra amino acid and was actually tested in humans
No, daily dosages of 5,000 mcg B12 methylcobalamin are considered safe

If youre vegan and not supplementing adequately, you may be at higher risk of deficiency.Whether injections or oral supplements are best depends on your levels and absorption

Consultation with a healthcare provider makes sense for any readings that enter potentially concerning territory
Dilute aqueous ammonia (1 to 10%): for strongly acidic sequences that need a mildly basic environment
