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c/coldchain·posted 1 year ago by u/soren_yildiz

why does nobody talk about ice pack

Explainer Cold Box ×7 Long Haul ×3 Sourced ×3

Genuinely asking, not being difficult.

Everyone in c/glp1aus repeats that cold chain is important. I believe it, but I have never seen anyone show why, and when I search I get 19 threads of people agreeing with each other.

Is there a paper? Is there a measurement? Or is this one of those things that is true because it has been repeated since 2023?

I am not trying to be the "source?" guy. I would just like a source.

4,476 up / 730 down86% upvoted28 commentsid 1u1pml30 Jun 2025

28 comments

23 in this archive, depth 5

best — the order this archive was captured in

u/priya_weiss548 points·1 year ago

Yeah, data logger is the only acceptable proof.

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u/soren_yildizOP254 points·1 year ago

Yeah, data logger is the only acceptable proof.

Adding to this: lyophilised is doing more work than the comment implies.

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u/search_before_post654 points·1 year ago

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

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u/nightowl_injector-1 point·1 year ago

Strongly agree. Peak temperature is not the whole story.

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u/elodie_kuipers1 point·1 year ago·edited

Which carrier and route?

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u/ice_pack_auditMOD1 point·1 year ago

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

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[deleted]1 point·1 year ago

[deleted]

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u/chidi_abubakar1 point·1 year ago

Not to be pedantic but packaging and excursion are being used interchangeably and they are not interchangeable in real life.

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u/soren_yildizOP1 point·1 year ago

Denmark to Denmark: 16 days with CPC and 35 days with SSA. Same route, different carriers, variance is real.

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u/britt_okwuosa1 point·1 year ago

Not to be pedantic but packaging and excursion are being used interchangeably and they are not interchangeable in real life.

Adding to this: packaging is doing more work than the comment implies.

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u/amara_dziedzic213 points·1 year ago

Germany to Germany: 12 days with ERP and 22 days with WWB. Same route, different carriers, variance is real.

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u/ferran_laurent68 points·1 year ago·edited

Yeah, data logger is the only acceptable proof.

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u/phase_two_pete135 points·1 year ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/ferran_laurent136 points·1 year ago·edited

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

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u/gustav_vermeulen30 points·1 year ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/ilias_steiner0 points·1 year ago

Titration speed is a side-effect dial far more than an efficacy dial.

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u/salma_vasquez1 point·1 year ago

Logger trace from my shipment: 11 hours at 31°C. Powder tested 98.6% against 99.1% claim. Tolerates more than the box implies.

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u/reship_roulette65 points·1 year ago

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

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u/runa_wikstrom41 points·1 year ago

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

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u/sten_palacios22 points·1 year ago

Peak temperature and how long at that temperature?

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u/sequence_checkerresearch peptides14 points·1 year ago

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

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u/soren_yildizOP10 points·1 year ago

Peak temperature and how long at that temperature?

Disagree on that part. 96.8% and 96.2% on the same vial is normal.

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u/tidy_vialdrawer_watch2825 points·1 year ago

Yeah, data logger is the only acceptable proof.

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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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c/coldchain rules
  1. Excursion claims need a logger trace or a photo taken at unboxing. "It felt warm" is not data.
  2. No tracking numbers, ever. They identify you and the recipient.
  3. Stability claims need a source or an explicit "this is my guess" label.
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