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c/coldchain·posted 9 months ago by u/cato_batista

small win: packaging stopped being a problem at week 66

Question Long Haul ×4 Sourced ×2

Quick one. Canada here.

packaging works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US.

Specifics: the route I used took 15 weeks and cost roughly what I expected. The admin was worse than the cost. The thing that would have saved me the most time was knowing which document to ask for at the start.

Happy to answer questions from anyone in the same jurisdiction.

2,527 up / 303 down89% upvoted59 commentsid q37p7728 Oct 2025

59 comments

21 in this archive, depth 6

best — the order this archive was captured in

u/india_generic_g223 points·9 months ago

Mechanistically the bit that matters is excursion. It explains most of the early profile and a decent chunk of the outcome.

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u/cato_batistaOP166 points·9 months ago

Mechanistically the bit that matters is excursion.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/cato_batistaOP-7 points·9 months ago

Strongly agree. Peak temperature is not the whole story.

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u/runa_wikstrom166 points·9 months ago

Half-life is about 168 hours, so steady state lands around week 7–5. Practical consequence: what you feel in week 1 is not what that dose does.

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[removed]123 points·9 months ago

[removed by moderator]

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u/marit_laurent78 points·9 months ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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u/soren_yildiz44 points·9 months ago

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

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u/cato_batistaOP32 points·9 months ago

That is net peptide content, not purity. Different number, different meaning.

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u/nayeli_iyer36 points·9 months ago

Not convinced. The evidence does not support that reading.

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u/cato_batista13 points·9 months ago

a warm courier van is a bigger problem for a mixed vial than for dry powder

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u/iman_castellanos61 points·9 months ago

data logger is the standard, gut feeling is not

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u/coldchain_karencold chain41 points·9 months ago

gel packs last 2 hours, after that you are relying on the box itself

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u/prior_auth_painappeals31 points·9 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/coldchain_karencold chain65 points·9 months ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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u/usb_logger_ursulaMOD68 points·9 months ago

Retitled to remove editorialising. Put the evidence in the body.

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u/nadia_kjaer23 points·9 months ago

time-at-temperature integral is the dose, not just peak temperature

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u/andres_restrepo138 points·9 months ago

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

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u/kian_ekstrom87 points·9 months ago

Peak temperature and how long at that temperature?

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u/vito_chowdhury73 points·9 months ago

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

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u/ewan_tulloch56 points·9 months ago

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

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u/ice_pack_auditcold chain86 points·9 months ago

Strongly agree. Peak temperature is not the whole story.

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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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