how to give a b12 intramuscular injection The Truth About Injections: Benefits, Cost & They Work Optimal B12 Injection Sites for

The evidence that is currently available is not sufficient enough to suggest that a lack of vitamin B12 has any significant or specific impact on weight, regardless of whether it causes weight gain or loss

Basically a study looked at 100 drugs & found that 90% of them were fully potent 15 years after their expiration date, though that may vary by drug, and perhaps liquid forms are a bit more vulnerable (perhaps)

The exceptions come down to what irritates the injection site

Evidence-based : Ensuring clinicians understand the difference between serum B12 levels and clinically active B12 stores, and other suitable tests to determine deficiency as well as symptom resolution with sufficiently frequent treatment