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Research published in 2011 found that elderly subjects had markedly lower glutathione concentrations compared to younger adults, with 83% higher fractional synthesis rates in young people

Quercetin and the related flavonoid fisetin occur in foods, quercetin in onions, capers, and apples and fisetin in strawberries, at amounts far below the trial doses, and whether food-level intake does anything for senescent cells has not been tested

The process of extracting oil from the fruit removes the water-soluble compounds, including peptides like glutathione

Low glutathione levels may be associated with certain diseases