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Intrinsic factor Intrinsic factor ( IF ), also known as cobalamin binding intrinsic factor , [5] or gastric intrinsic factor ( GIF ), is a glycoprotein produced by specialized cells of the stomach, either by parietal cells (in humans) or chief cells (in rodents)

For broader context on nutrition trials see this randomized trial registry entry: clinical trial listing and for a recent review of vitamin B studies see this open-access review: PMC article

That said, theres no harm in combining the two supplements, so it cant hurt to try

A diet full of vitamins and minerals is the best way to stay healthy and give your body what it needs to thrive