does b12 injections make you tired Vitamin Injection Side Effects and Safety Feeling worse after B12 Injection:

Cardiovascular and Immune Health B12, B6, and folate help regulate homocysteine levels, which supports heart health and circulatory function

Consider Medical History: If you have absorption issues or a history of low energy, shots may be more effective

However, the type and severity of allergies vary from person to person and range from minor irritation to severe allergic reactions

Individuals with Gut Absorption Issues : Conditions like Crohn's disease, celiac disease, or pernicious anemia (an autoimmune condition where the body can't produce intrinsic factor, a protein needed for B12 absorption) can significantly impair B12 uptake