b12 tablets vs injection supplement B12 Shots vs. IV Infusions: What is the difference? Oral B12 vs. B12 Injections:

Values show the difference from untreated control (n=3 except for NMN+hCD38+isa where n=4 biologically independent samples)

In case you are suffering from severe Vitamin B12 deficiency, there are two ways to treat it

"Increase of fat oxidation and weight loss in obese subjects caused by chronic treatment with human growth hormone or a modified C-terminal fragment." Int J Obes Relat Metab Disord

These occur in less than 2% of research participants

Risk of Infection: If not done properly, there is a risk of infection or injury when administering injections at home

Oral doses of 1000 g deliver 5 to 40 g, even if taken with food