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An alternative: Measuring urine levels of xanthurenic acid following intake of a high dose of tryptophan
In addition, B12 deficiency-associated fatigue is often accompanied by other symptoms such as numbness and tingling, cognitive impairment (memory and concentration problems), mood swings (depression), skin changes (pale skin), shortness of breath, or fast heart rate
Blackwell and the team
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Switching to a different brand or formulation without problematic excipients (such as lactose-free or hypoallergenic options) may resolve symptoms
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