b12 prefilled injection vitamin Bacteriostatic Water – Biohack Peptides Veterinarians may prescribe vitamin B12 injections to animals with a deficiency B!2 Inject Kit: Package Insert
Description
B12 keeps your skin, hair, and nails healthy and it aids in the production of new skin

Mild water retention: A small percentage of users report temporary water retention

But the best schedule depends on many things, like lifestyle, diet, and health

For ongoing care, especially if you have a chronic condition causing the deficiency, you might need maintenance shots, maybe every two months or even monthly