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Kramer, M
When B12 is deficient, this metabolic pathway becomes disrupted, leading to reduced ATP (adenosine triphosphate) production at the cellular level
These may include: ( 4 ) Fatigue or lack of energy Brain fog or trouble concentrating Irritability or mood swings Pale skin or shortness of breath Tingling in the hands and feet Difficulty walking or staggering Anemia Swollen or inflamed tongue A B12 deficiency in men may also contribute to low testosterone, weight gain, and poor exercise recoverymaking it a hidden factor in many mens health concerns
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