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c/coldchain·posted 1 months ago by u/andres_restrepo

light exposure matters more for some compounds than others and nobody tabulates it

Question Long Haul ×5

Week 3 update. 19kg down from the start, early fullness basically gone since about week 43.

Things that worked: consistency, protein at breakfast, walking more than I want to. Things that did not: everything I bought on the internet to help with early fullness.

The part that surprised me is how much of this is admin. Ordering, storing, logging, remembering. Nobody mentions that the hard bit is not the drug, it is the routine.

Happy to answer anything. Please do not ask me what dose you should be on.

464 up / 137 down77% upvoted21 commentsid ptq2lv29 Jun 2026

21 comments

20 in this archive, depth 6

best — the order this archive was captured in

u/bence_ibarra47 points·1 months ago·edited

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/niels_yilmaz22 points·29 days ago

This is correct. Dry powder is way more robust than liquid.

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u/bruno_dumitru15 points·29 days ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/low_appetite_lisa12 points·1 months ago

Strongly agree. Peak temperature is not the whole story.

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u/ms_fragmenter10 points·1 months ago

stability after excursion is not zero, it is dose-dependent

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u/andres_restrepoOP6 points·29 days ago

Canada to Canada takes 23 days on average, variance is 5 days

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u/andres_restrepoOP6 points·29 days ago

Respectfully this is a sample of one presented as a finding.

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u/bence_ibarra4 points·29 days ago

gel packs last 12 hours, after that you are relying on the box itself

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u/usb_logger_ursula1 point·28 days ago

the logger trace is the data that matters, not the packaging promises

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u/emeka_delgado9 points·29 days ago

customs clearance often breaks the cold chain, factor that in

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u/andres_restrepoOP-29 points·29 days ago

Yeah, data logger is the only acceptable proof.

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u/spain_receta49 points·29 days ago·edited

Dead space in the needle hub holds a small but non-trivial volume. On low-volume draws that can be several units.

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u/meera_sandvik34 points·1 months ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/coldchain_karencold chain10 points·1 months ago·edited

Strongly agree. Peak temperature is not the whole story.

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u/niels_yilmaz4 points·29 days ago

Which carrier and route?

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u/marit_laurent11 points·1 months ago·edited

customs clearance often breaks the cold chain, factor that in

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u/ewan_tulloch20 points·29 days ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/dario_bakken7 points·29 days ago

stability after excursion is not zero, it is dose-dependent

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u/amara_dziedzic3 points·29 days ago

customs clearance often breaks the cold chain, factor that in

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u/runa_wikstrom2 points·29 days ago

Slight fix: the number was 96.8, not 94.2. Decimal point, but a fairly consequential one.

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About c/coldchain

Temperature and stability in the real world: what an excursion actually costs you, why lyophilised powder is far more forgiving than reconstituted solution, how to read a logger CSV, and how to photograph a failed shipment so the conversation with the vendor is short.

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