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doi: 10.1111/gtc.13185 45 SarwarSRandallG

It is possible to buy a private vitamin B12 self-test, which will either be in the form of blood being taken by a professional or as finger-prick blood sample to do yourself via post

Kelly et al

[DOI] [PMC free article] [PubMed] [Google Scholar] 143.Liu K., Zhao R., Shen M., Ye J., Li X., Huang Y., Hua L., Wang Z., Li J
