Dr.SleepRoch said:They are two different exemptions from the same federal requirements and they buy different things.
This is where I part company with the consensus forming above. A research-chemical supplier selling lyophilised powder labelled research use only is not compounding and is not claiming to. It is a different legal universe with no pharmacy oversight, no patient relationship and no content guarantee, and conflating the two in these threads helps nobody.
A1cHero_PHX said:Two pharmacies quoted me last year, one describing itself as 503A and one as 503B, and I assumed 503B just meant bigger until both stopped within…
Beyond-use dating (BUD) for compounded supply compounded products:
Lyophilized (unreconstituted): typically 9 months from compounding date
Reconstituted with BAC water: typically 28-30 days refrigerated
Reconstituted with sterile water: typically 7 days (no preservative!)
Always use BAC water for multi-dose vials. Sterile water has no preservative and supports bacterial growth after first puncture. This is a common and potentially dangerous mistake.
pete_manc_UK said:A research-chemical supplier selling lyophilised powder labelled research use only is not compounding and is not claiming to.
I have been on both brand and compounded, and in the context of compounded supply, my experience has been equivalent with both. The key is finding a reliable 503B pharmacy with independent testing.
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Shop Reference StandardsFollowing on from Dr.GutHealth — and this may be the naive question:
Why a shortage listing created a legal pathway at all, since a shortage is a supply fact rather than a permission?
OP back with an update, since a thread like this is useless without one.
The bulks-list asymmetry was the piece I had missed entirely. It explains why one of my two pharmacies is still arguing it can supply and the other simply stopped.