why are my b12 injections not working Vitamin Deficiency: Causes, Symptoms, and Treatment How Quickly Does B12 Shot

People with mitochondrial diseases should consult a specialist before using any compound that alters mitochondrial function

When adverse effects occurred, they were typically mild and transient, with the most common being mild to moderate headaches (similar frequency to placebo groups), minor injection site reactions (redness, slight swelling), and gastrointestinal effects at higher oral doses (nausea, diarrhea)

If a pharmacy cannot or will not provide them, that is a red flag

Deficiency is more common than many people realise particularly in those following plant-based diets, individuals with gastrointestinal conditions affecting absorption, and older adults