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Research from Tufts University finds that by age 75 or 80, around 40 percent of people have a diminished ability to absorb B12 from food

Essential role of nonessential amino acid glutamine in atherosclerotic cardiovascular disease

Furthermore, mast cell activation and histamine release may play a role in acute COVID-19 infection and chronic PACS, indicating a therapeutic and prognostic potential for an anti-histamine diet (Afrin et al., 2020)

However, because supplements contain multiple compounds, this also means more potential for interactions with medications or other herbs

In: Lambris, J

Trends Endocrinol Metab (2012) 23:18693