B12 Spray|Sublingual Mucosal Absorption | Bioceuticals 50ml Sublingual oral spray for efficient absorption. One of the ways in which vitamin B12 is absorbed is by passive diffusion across mucosal membranes. Great for people on the go. May be beneficial for people at risk of vitamin B12 deficiency such as the elderly, vegetarians and vegans. Vitamin B12 assists in healthy: neurological function methylation pathways, specifically through its role in the conversion of homocysteine to methionine and the regeneration of tetrahydrofolate/folate red blood cells gastrointestinal function metabolism of protein, carbohydrates and fats male and female fertility energy production formation of DNA and the normal growth and replication of all cells oral health: reducing the frequency, severity and duration of recurrent mouth ulcers, in otherwise healthy people.