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While we listed two options above, here are three additional supplements worth considering: NOW Foods Methyl B-12 lozenges: With the option to chew or let them dissolve in your mouth, these lozenges provide 41,667% of the DV for vitamin B12

Vitamin B12 injections are delivered directly into the bloodstream, bypassing the digestive system

The Cochrane reviewers graded the vascular-dementia benefit as very low quality, the trials cluster in regions where manufacturer influence and publication bias are hard to exclude, and a mortality-neutral result with a harm signal at high dose is not a ringing endorsement

How Long Do the Benefits Last

So most of the evidence comes from animal models , experiments on animals, most often rats