IL-13, another cytokine known to induce mucin production, has generally been associated with the upregulation of MUC5AC instead of MUC5B in human bronchial epithelial cells but has been shown to upregulate both MUC5AC and MUC5B in murine models (Zhen et al., 2007
A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient
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Readers sometimes prefer a higher concentration to reduce injection volume, but the tradeoff in measurement accuracy is rarely worth it, especially for those new to subcutaneous injections
The numbers tell a clear story
2000 Sep 22;67(18):2257-65