Any benefit of sublingual vitamin B12 as it related to weight loss is most likely due to some other component
Whilst high B12 itself is not typically harmful, it may indicate an underlying condition requiring investigation and management
Professional care ensures: Safety : Proper technique reduces the risk of side effects
Read the full study: The effects of human GH and its lipolytic fragment (AOD9604) on lipid metabolism following chronic treatment in obese mice and 3-AR knock-out mice (Endocrinology 2001)
This is unlike fat soluble vitamins, like vitamins A, D E, and K, which will continue to get stored in the bodys fat when supplemented excessively, and can lead to side effects if over supplemented beyond the bodys needs
Using a Drawing Needle For a truly professional technique, its best to use two separate needles: one for drawing the B12 from the vial and a new one for the injection itself