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When B12 runs low, symptoms tend to creep in slowly enough to get blamed on something else: persistent fatigue, brain fog, low mood, weight gain or difficulty losing weight, weakness, tingling in the hands or feet, shortness of breath, and a weakened immune system
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(20) Intestinal problems: Because B12 is absorbed in the intestines, any disease that impairs intestinal function can interfere with B12 absorption
Trouble focusing or memory lapses: With too little B12, your brain clouds up, making it hard to stay sharp or hold onto thoughts clearly
Concentration 5mg/ml Overview Methylcobalamin is an active form of Vitamin B12