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Key Takeaway Neither is universally better

Phase 2 is much more involved

Get your labs drawn in the comfort and privacy of your home or office

Some people with certain deficiencies such as Crohns disease and coeliac may struggle to get enough B12 in their diet. If you think youve overdosed on vitamin B12, Dr Thornber recommends you contact your GP or a hospital ASAP.

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Grasbeck R, Nyberg W, Reizenstein P
