They are not approved by the FDA for human or veterinary use, and reputable vendors state that on every page
For example, while low-dose polyphenols stimulate endogenous antioxidant defenses, high concentrations, such as those found in concentrated supplements, can act as potent pro-oxidants, leading to increased oxidative stress and cellular damage 51
Liposomal glutathione achieves 50-90% bioavailability at 500-1000 mg daily doses
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Consequently, the apparent efficacy of a therapeutic agent and the relative contribution of a specific pathway to ferroptosis can appear context-dependent
They are administered by injection or in a nasal spray form