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Smoking is a potential risk factor for regular use of high-dose vitamin B12 supplements as hepatic tumorigenesis may be promoted
and losing weight at the same time
Also, some medications can interfere with B12 absorption
And since ferritin is a marker of long-term iron intake, it's perfect for determining whether that worn-down feeling can be linked to your diet
It means it didn't work well enough as a standalone pharmaceutical drug
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