vitamin b12 injection amazon at a Licensed Pharmacy such as vitamin b12 injection dose in

"How Can Pernicious Anemia Be Prevented?"

In regards to loss of weight, there is no documented outcome that supports vitamin B12 shots or injections promoting weight loss

See GLP-1 Peptides Explained for broader context on GLP-1 therapy

Obviously this ignores all those who require life long treatment due to other causes of B12 deficiency (of which there are many), thereby potentially causing great harm to the vast majority of their B12 deficient patients

optimization vs

Nitrous oxide exposure (medical or recreational) can cause functional B12 deficiency requiring urgent treatment, particularly if neurological symptoms develop