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The stability data for lyophilized retatrutide shows clear temperature-dependent shelf life profiles

There are plenty of alternatives

Nutrition 18:761766 Broeer S (2002) Adaptation of plasma membrane amino acid transport mechanisms to physiological demands

10.2174/1570159X16666180419141613 20 FanJ.LiB.GeT.ZhangZ.LvJ.ZhaoJ.et al (2017)

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For unopened vials of Retatrutide Powder, the compound can be stored at room temperature for a validity period of up to two years when unopened, though refrigeration or freezing significantly extends this timeframe