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Nelson Textbook of Pediatrics (20th ed.)
"How Nature builds the pigments of life" (PDF)
Understanding this is the foundation for understanding why dosing is not a one-size-fits-all figure: the molecule behaves differently from the compounds people often group it with
Malabsorption Issues : If you have conditions like pernicious anemia, Crohns disease, or have had weight loss surgery, vitamin B12 injections may be a more effective option due to the bodys difficulty absorbing B12 through the digestive tract
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