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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

Or does it affect reproductive fitness

Acetyl l-carnitine and alpha lipoic acid synergize to improve exercise performance in two ways

It is crucial to discuss any existing allergies or medical conditions with your doctor before starting a regimen involving B12 shots to ensure safety and efficacy