Oct 30, · Use cyanocobalamin (B12) nasal spray as ordered by your doctor. Read all information given to you. Follow all instructions closely. Do not take cyanocobalamin (B12) nasal spray by mouth. Use in your nose only. Keep out of your mouth and eyes (may burn). Keep taking cyanocobalamin (B12) nasal spray as you have been told by your doctor or other. Aug 29, · Optimal dosing of vitamin B12 varies by age, lifestyle, and dietary needs. The general recommendation for adults is mcg. Older adults, as well as Author: Melissa Groves.
Jan 10, · B12 tablets 5 mg B12 powder (simply made from one or two of the above 5 mg B12 tablets crushed under a tablespoon) B12 liquid drops, containing 1, mcg B12 per liquid drop.