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Sublingual (under-the-tongue) forms dissolve in your mouth, theoretically enhancing absorption by allowing some B12 to enter the bloodstream through mucous membranes rather than relying solely on digestive uptake
Injections allow the body to absorb Vitamin B12 without it having to go through the digestive system like oral tablets
Colchicine has been shown to induce reversible malabsorption of vitamin B12, apparently by altering the function of ileal mucosa
As we age, we do not absorb B12 efficiently from our diet
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