are b12 injections better than sublingual Should You Use Over Capsules & Shots? B12 Under the Tongue: Uses,
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10.1210/jc.2009-1579 3 BegleyE.McVeighJ.HopeV.BatesG.GlassR.CampbellJ.et al (2017)

Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency

Vitamin B12 can do much more than merely improve your mood: it can play a major part in metabolizing serotonin
If youre not getting the results youre expecting, try making similarly healthy lifestyle decisions before deciding to titrate up

doi: 10.1371/journal.pone.0134927

and slows aging
