One concrete data point for the thread. Practical: unopened, refrigerated at 2 to 8°C; in use, refrigerated and used within the preservative-limited window; never frozen; and a visual check every time — a haze that does not settle is a reason to stop, not to wonder.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
One thing that is still open after Dr.PeteFamMed’s answer:
What a temperature excursion actually does, and what distinguishes an unopened vial from one already in use?
hank_denver said:Practical: unopened, refrigerated at 2 to 8°C; in use, refrigerated and used within the preservative-limited window; never frozen; and a visual check…
International shipping tracking for cross-border ordering orders: my experience with customs in the US when ordering from overseas:
Seized and destroyed — had to get a reshipped package.
Tips: always include a copy of your prescription, declare medication properly on customs forms, keep quantities reasonable (personal use = 3 month supply max), and use a vendor who has experience shipping to your country.
Sigma-Aldrich — Research-Grade Standards
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Shop Reference StandardsClosing the loop on my own question.
Follow-up — I binned the frozen one. Aggregation does not undo itself and I was not going to inject a maybe.
anna.melb_AU said:International shipping tracking for cross-border ordering orders: my experience with customs in the US when ordering from overseas: Seized and…
My experience ordering cross-border ordering internationally: I've ordered from a Canadian pharmacy. Customs can be hit or miss.
Shipping time: 10-21 days
Customs clearance: held for 3 days then released
Quality: Janoshik tested at 97.6% purity
International ordering adds complexity but can save 60-80% compared to US prices. Research your country's import laws first.