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Vitamin B12 deficiency can lead to brittle nails, changes in nail texture, and slow nail growth
That said, large randomized human trials for specific indications (like hair loss or systemic anti-aging) are still limited
A 2015 meta-analysis found that NAC reduced chronic bronchitis or COPD exacerbations, though later research has been mixed, including a 2024 trial in mild-to-moderate COPD that did not find a significant reduction in overall exacerbation rates with high-dose NAC.1 22 Fertility Oxidative stress can damage sperm, eggs, and the reproductive environment, which is one reason antioxidants are often studied in fertility research
Researchers should avoid assuming that a mechanism observed in one tissue necessarily explains all effects in another tissue
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