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Oral supplements must steer your entire digestive system, where absorption can vary wildly from just 1.2% to 40% depending on your individual health factors
B12 injections can help improve energy levels, particularly in individuals with low B12 levels
TEN is sold in grocery stores across the U.S
Bruce HR Wolffenbuttel About the author Bruce Wolffenbuttel is a Professor Emeritus MD PhD and an expert in endocrinology, metabolic diseases, and diabetes, with numerous published papers to his name
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