Absorption of compounded Rapamycin?

I think it was in a podcast by Peter Attia where I heard that the compounded forms of Rapamycin were not absorbed as well as the version from the drug company. Anyone familar with this concern?

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Discussed here New Peter Attia interview w/Matt Kaeberlein, inferior bioavailability of encapsulated rapa

And here Bioavailability of Rapamycin From Compounding Pharmacy