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2015 100 ng/kg optimal dose

The FDA has identified limited clinical information and potential safety concerns involving these compounded substances

Unlike most nutrients, absorption of vitamin B12 actually begins in the mouth where small amounts of unbound crystalline B12 can be absorbed through the mucosa membrane [16] Food protein bound vitamin B12 is digested in the stomach by proteolytic gastric enzymes, which require an acid pH (Even small amounts of B12 taken in supplements bypasses these steps, and thus, any need for gastric acid, which may be blocked by antacid drugs)

Always do your calculations in micrograms (mcg) as it's the standard unit for peptide dosing