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Headaches: Oxygen deprivation can also affect your brain and lead to frequent or persistent headaches

It is research-use-only and not for human consumption

Stress, fatigue and 'brain fog' as well as reduced physical stamina are common side effects of vitamin B12 being below optimal

Q2: How long does a headache after B12 shot last

Always tell your doctor about all your current medicines, including any prescriptions, over-the-counter drugs, vitamins, and herbal products