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May 28 2022 RodanSarohan et al., Clinical Nutrition Open Science, doi:10.1016/j.nutos.2022.05.007 Retinol Depletion in COVID-19 Comparison of 27 COVID-19 ICU patients and 23 control patients, showing significantly lower vitamin A levels in COVID-19 patients

However, B-12 shots may have other side effects

In the early stage after injury, pro-inflammatory macrophages are mainly involved in the local inflammatory reaction, which promotes the recruitment of neutrophils by secreting pro-inflammatory cytokines

No harmful effects

The enzyme glutamine synthetase (GS) adds another ammonia (NH) to glutamates side chain carboxyl group in an ATP-dependent reaction to produce L-glutamine [15]