Vitamin B12 shot side effects Most people tolerate vitamin B12 injections well, but possible side effects include: Mild: soreness or redness at injection site, mild diarrhea, nausea, headache, itching Rare but serious: allergic reactions (rash, swelling, difficulty breathing), low potassium (hypokalemia), dizziness or heart rate changes Get emergency medical help if you have signs of an allergic reaction to Vitamin B12: hives
GHK-Cu has a substantially larger research base
Where Phase I or Phase II human trials exist, they are noted in the compound page summary
megaloblastic anemia
Administering the Injection Choose the Injection Site : IM Injection Sites : Common sites include the deltoid muscle (upper arm), gluteus maximus (buttocks), and vastus lateralis (thigh)
In adipose models, reduced NNMT activity has been linked with smaller adipocyte size and diminished fat depots, suggesting a potential role for this inhibitor in fat mass modulation under research conditions