how does a b12 injection make you feel to Give Injection: Step-By-Step Instructions Benefits of Vitamin B12 Shots
Description
The short half-life (approximately 30 minutes) means each injection creates a transient burst of fat mobilization rather than sustained activity

Refrigerator space for reconstituted vials

World Health Organization
That little push can make a big difference in long-term change
This article points out the benefits of B12 injections and how long they can last
