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No preservative means faster potential microbial growth if the vial is accessed multiple times, but avoids any potential benzyl alcohol interaction if this is a concern for your specific model
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Hepatic glutathione homeostasis in the rat: efflux accounts for glutathione turnover [PMID: 6745847] Laboratory literature summary: Hepatic glutathione homeostasis in the rat: efflux accounts for glutathione turnover