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can i have a b12 injection with a cold Vitamin at Licensed Pharmacy Vitamin B12 Injections: What You
Description
Vitamin Injections Vitamin injections, along with a healthy diet and exercise routine, can safely support your wellness and weight loss journey
Boosts Immune Function: B12 supports white blood cell production, vital for a robust immune response

1957 Jul-Aug;5(4):431-9

In many places, yes
Metformin and body weight

This chart may be useful as an overview: What Are The Symptoms of Vitamin B12 Deficiency