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Research exploring What Causes Long COVID

Association of Human Whole Blood NAD + Contents With Aging

Its deficiency is seen in people with poor nutrition, infection, cancer, surgery, alcohol, pernicious anemia, medications (PPIs or other acid-suppressing drugs), exposure to nitrous oxide (during surgery or recreational use), stomach/intestinal problems such as intestinal dysbiosis, leaky gut or gut inflammation, atrophic gastritis or hypochlorhydria (low stomach acid) and/or nerve damage

Conclusion Vitamin B12 supplementation is most effective for treating specific deficiencies, while B complex supplementation may offer broader metabolic and health benefits, particularly in certain populations such as pregnant women, individuals with diabetes, or those seeking improved physical performance

PMID 29543316