b12 self injection where injections are given How to self-inject intramuscular vitamin B12 METHYLCOBALAMIN SELF INJECTION KIT

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Early warning signs include persistent fatigue that does not improve with rest, difficulty concentrating or brain fog, tingling or numbness in hands and feet, weakness in the legs, dizziness when standing up, pale or yellowish skin, and a sore or swollen tongue

Without enough B12, you might feel tired, weak, or have numbness in your hands and feet

Rare but serious: allergic reaction (hives, trouble breathing, face swelling) call 911

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B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers