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Another source of deficiency can be malabsorption issues, where the body is unable to properly absorb B12 from the intestines due to various gastrointestinal disorders
Those with more adipose tissue or slower initial response may benefit from increasing to 400-500mcg
The freezing and thawing process can denature them, rendering them ineffective
Rahman M, Ahmad MZ, Kazmi I, Akhter S, Afzal M, Gupta G, et al
References are provided for informational purposes related to published scientific literature
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