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Limited clinical trial data to justify its use in COVID-19 Most of the clinical studies where NAC has been used (either alone or in combination with another drug) tend to focus on its use as a mucolytic in two population subgroups: paediatric populations at lower doses where its antioxidant effects are less evident (6) with studies dating mainly from the 1970s and 1980s of low quality evidence

Food Chemistry 233: 429-433

Beyond whitening, glutathione detoxifies the body, boosts immunity, and reduces oxidative damage

The use of cattle byproducts raises ethical and environmental concerns for some consumers, particularly those following vegetarian or vegan diets