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The articles from Drugs.com, WebMD, MedicineNet, and Biom do not reference any study to back up their claim, whereas the other three articles all cite an experiment performed on brewers yeast called Impact of glutathione metabolism on zinc homeostasis in Saccharomyces cerevisiae

[DOI] [PubMed] [Google Scholar] Luo M, Zhou L, Huang Z, Li B, Nice EC, Xu J, Huang C

The aging process can affect the stomachs ability to produce intrinsic factor, necessary for B12 absorption

Age changes this delicate system

Supplements and Nutrition Alongside medication, a nutrient-rich, balanced diet and appropriate supplements can support thyroid function and hormone activation