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Stanley TL, Fourman LT, Feldpausch MN, et al
High doses of B12, often used to treat deficiencies, may cause side effects such as headaches, nausea, diarrhea, fatigue or weakness, and tingling in the hands and feet
Some patients notice reduced appetite suppression or return of cravings mid-cycle, which sometimes signals a storage issue rather than medication failure
Many of the causes of B12 malabsorption are related to impaired hcl and intrinsic factor production
Some practitioners may recommend B12 shots up to two times per week to enhance energy levels and fat metabolism [2]
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