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A study published in Nutrition and Cancer found that dairy products, cereals, and bread are generally low in glutathione

Mice in the Control and DSS groups received daily saline gavage for 14 days, while the treatment groups were gavaged with either 5-ASA (40 mg/kg) or GHK-Cu (20 mg/kg)

[Abstract]2024 Apr 12:1720:464776
Having gastric surgery also increases the risk of b12 deficiency
doi:10.1097/01.ede.0000257063.77411.e9

That stability hints at a maturing market for the most established research peptides: there are enough vendors in each category that no single vendor's promotion swings the median, and demand patterns are predictable enough that vendors don't need aggressive price-cutting to clear inventory