b12 nasal spray vs injection NAD+ IV Injections vs B12 Nasal Spray vs Injection:

Hydroxocobalamin tends to remain in the body longer and is more readily converted to the active coenzyme forms of B, which can make it effective for maintaining B levels

It depends on the person and the severity of the pain

Make sure that each injection is about an inch (two finger-widths) from the last injection

This keeps your treatment working well and safe

Open the syringe and needle packages but do not extract them until you are ready to insert the needle onto the syringe and withdraw the vitamins

So, if you're feeling unwell due to a deficiency, restoring B12 levels might help you feel well enough to eat normally, but it's not "making" you gain weight in an unhealthy way