Functional foods have been classified into several distinct types based on their source, either animals or plants or as bioactive ingredients and their degree of modification as shown in Fig
However, a pharmacovigilance study using the WHO's global adverse drug reaction database found disproportionate reporting of eating disorder adverse events with all three major GLP-1 medications ( Nishida et al., Clinical Nutrition, 2025 )
Among the alternatives, glutathione injections have drawn a lot of interest due to their antioxidant and skin-brightening properties
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It remains a peptide by molecular definition
Furthermore, it supports investigations into non-alcoholic steatohepatitis mechanisms actively