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BMJ article on ethical approval from 2009 bmj.com/content/338/bmj.b450 The letter just says in line with guidelines

Sohail et al., 2023)

Glutathione Is the Body's Master Antioxidant
Sometimes, however, it needs a little help

This can result in more muscle mass, improved fat metabolism, enhanced skin quality, and potentially anti-aging effects

Even in the same category of tea, L-theanine content also showed significant differences among genetic background, temperature and season, and growth periods
