b12 deficiency injection frequency How Often Should You Get A Shot For Optimal Health? Vitamin B12 Dosages: Your GoodRx

Boost energy and maintain an active lifestyle with B12 injections that reduce fatigue and support weight management Feeling tired all the time

And in the 80s it increased to every three months, which is still what they use today

While very high oral doses (1,000 to 2,000 mcg) can achieve some passive absorption without intrinsic factor roughly 1% of the dose is absorbed passively many clinicians prefer the reliability and rapid correction offered by injections in this population

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