This is consistent with the peptides origin in gastric juice and its role in protecting and rebuilding the digestive lining
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Tarabov, B., Luke, P., Hammer, M.U., et al., Fluorescence measurements of peroxynitrite/peroxynitrous acid in cold air plasma treated aqueous solutions, Phys
However, another study showed that its absorption is variable and may be limited, but it is not completely ineffective, as some studies suggest modest increases in body glutathione levels
emmeans: estimated marginal means, aka least-squares means