Weakness, numbness, and stabbing pain are common symptoms
These vitamin injections work when combined with proper nutrition and regular physical activity, highlighting their role as one component of a broader wellness strategy
For example, a syringe may be listed as 1 mL, 30G, 1/2 inch, U-100, which means the listing shows barrel capacity, needle gauge, needle length, and unit-of-use marking format at the same time
See guidance from reputable medical sources such as Mayo Clinic and expert summaries like the one from the Cleveland Clinic that explain B12 injections are not a proven weight-loss therapy for people with normal levels
One way it does that is by supporting T cells, a type of white blood cell that attacks foreign invaders and protects you from infection (3)