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These include: Vegetarians and vegans, as vitamin B12 is mainly found in animal products Older adults, as they absorb vitamin B12 less well with age People with gastrointestinal disorders, like celiac disease or Crohns disease, which can block vitamin B12 absorption Those taking certain medications, such as proton pump inhibitors or metformin, which can also block vitamin B12 absorption Its best to talk to a healthcare professional about whether you need vitamin B12 supplements
The total amount of vitamin B 12 stored in the body is about 25 mg in adults
Week 1-2: Minimal visible changes You're unlikely to see much in the first two weeks
Duration: Preclinical studies have lasted about 4 weeks on average
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