deep subcutaneous injection vitamin b12 Choosing the Right Needle and Syringe for Injections: A Complete Guide Vitamin B12 Injection - 10mL
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Sources: Hangovers - Symptoms and causes | The Mayo Clinic Drug Bioavailability - StatPearls | NCBI Bookshelf

The human body is usually quick to adjust, though, so these symptoms should fade soon afterward
If you have noticed changes in bowel habits after starting vitamin B12 supplementation, it is worth reviewing the complete formulation of your supplement and discussing any concerns with your GP or pharmacist

Maybe and maybe not
