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Likewise, SARS-Cov-2 infection and acute COVID-19 are accompanied by an inflammatory response [29], increased MPO activity [45], indicants of oxidative damage [46,47,48] and increased NO production including increased levels of nitrotyrosine [49], and lowered antioxidant defenses (ANTIOX) as indicated by reduced TAC levels [45, 49], Gpx [50], and zinc [51]
Individuals with B12 deficiency, which can occur due to dietary restrictions (e.g., vegan or vegetarian diets), gastrointestinal disorders affecting absorption, older age, or certain medical conditions that interfere with B12 absorption
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& Odlaug, B
