headache from b12 injection What Does A Deficiency Feel Like Headache after b12 intake :

doi:10.1371/journal.pone.0225761 Yin JJ, He Y, An J, et al

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Neurological symptoms are particularly characteristic and may include: Paraesthesia (pins and needles) in the hands and feet Numbness or altered sensation in the extremities Difficulty with balance and coordination, often due to spinal cord involvement (subacute combined degeneration) Memory problems and cognitive impairment Mood changes, including depression and irritability Visual disturbances (rare and usually in advanced deficiency) Haematological manifestations commonly present as symptoms of anaemia: Persistent fatigue and weakness Breathlessness, particularly on exertion Palpitations or rapid heartbeat Pale or jaundiced (yellowish) skin Glossitis (sore, red tongue) Mouth ulcers Additional signs may include: Unexplained weight loss Diarrhoea or constipation Loss of appetite Muscle weakness The severity and combination of symptoms vary considerably between individuals

It may be safe to state that suitable supplementation is protective and side effects of taking vitamin B12 supplements is highly unlikely

Cobalamin Coenzyme Forms Are Not Likely to Be Superior to Cyano- And Hydroxyl-Cobalamin in Prevention or Treatment of Cobalamin Deficiency