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As people age or encounter certain health issues, their intrinsic factor production can decrease, leading to lower B12 absorption from pills
The dose of 2000 micrograms of B12 is more than 800 times the recommended daily amount so, on the face of it, this dose seems too high, but as you increase the amount of B12 in your diet, less of a percentage will be absorbed
If you get a B12 injection and it stings, that means it's not just B12
While benzyl alcohol is quite stable, prolonged exposure to heat can eventually lead to oxidation, reducing its potency as a preservative
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