He would get dizzy, and light-headed
Persistent bleeding or expanding bruising may indicate that you hit a small blood vessel, which is generally harmless but can be minimized with proper technique
They can also be produced via various laboratory methods, such as solid-phase peptide synthesis (SPPS)
Why Injections Work Differently Than Pills The speed at which B12 works is tied to how it enters your body
[10] [4] Patients should contact their GP if they experience persistent or severe side effects, signs of allergic reaction (facial swelling, difficulty breathing, severe rash), or if symptoms of B12 deficiency (such as neurological symptoms, severe fatigue, or glossitis) do not improve after several weeks of supplementation
The risk of infection: Any time you receive an injection, there is a risk of infection