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What the science actually says Here is where the marketing and the evidence part ways: Metabolism
A vitamin B12 deficiency can lead to megaloblastic anemia, a condition characterized by a low number of red blood cells that are larger than normal ( Megaloblastic anemia can cause a variety of symptoms and side effects, including ( shortness of breath headache heart palpitations fatigue poor balance memory loss That said, being low in vitamin B12 doesnt always lead to megaloblastic anemia, and many people may only experience mild symptoms like fatigue ( Furthermore, while a deficiency in vitamin B12 may not cause weight gain, it can decrease energy levels and contribute to fatigue, making it harder to stay active and manage your weight
Other compounds share this cellular-level approach
According to the available scientific data, research experiments in rodents have lasted up to 45 days, with most studies ranging between 11-45 days or four weeks on average [3, 4, 7]
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