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Unfortunately, the body does not produce it
Many approaches to weight loss, including severe caloric restriction and even some GLP-1 medications, can lead to substantial loss of lean tissue along with fat
For most people, expect about one to two weeks of noticeable effects, with the exact timing shaped by your levels, metabolism, diet, absorption, and age
Conditions like Crohn's and celiac disease, along with past surgeries involving the stomach or small intestine, can each get in the way of how well you take up B12
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