can vitamin b12 injections cause headaches Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy Vitamin B12 Supplements and Injections

They show whether your current injection frequency is keeping your levels in the optimal range or if its time to make a change

The severity of the deficiency decides how much and how often you get shots

Whilst there are published reports showing levels above normal can cause acne, there are no data Im aware of to show whether or not there might be a subset of patients in whom normal serum levels can trigger acne or an acne-like rash, she says

Intramuscular Injections: In severe cases of B12 deficiency or when there is impaired absorption in the gastrointestinal tract, healthcare providers may recommend B12 injections

If you think 125,000% seems excessive, you may be right (NIH-a, 2021)

Effective for Deficiency: People with gastrointestinal operations, absorption difficulties, or pernicious anemia benefit most from injections