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c/coldchain·posted 26 days ago by u/kian_ekstrom

[Data] 41 lanes, 900 data points, transit temperature by carrier

Data Well Actually ×2 Sourced ×1

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 21 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.

1,415 up / 72 down95% upvoted56 commentsid r7o32q3 Jul 2026

56 comments

29 in this archive, depth 5

best — the order this archive was captured in

u/hamza_weiss211 points·25 days ago

Strongly agree. Peak temperature is not the whole story.

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u/marit_laurent54 points·24 days ago

Small correction: the trial was 4 weeks, not 33. Does not change your point but people will quote it.

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u/split_dose_sceptic-16 points·24 days ago

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

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u/iman_castellanos0 points·24 days ago

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

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u/india_generic_g105 points·24 days ago

lane reports need origin, destination, carrier, and actual transit days

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u/creatine_and_cardio167 points·24 days ago

lyophilised powder is far more forgiving than reconstituted solution

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[deleted]68 points·24 days ago

[deleted]

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u/prior_auth_painappeals52 points·24 days ago

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

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u/nightowl_injector28 points·24 days ago

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

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

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u/mod_cold_roommod · c/coldchain233 points·24 days ago

Strongly agree. Peak temperature is not the whole story.

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u/anya_salgado80 points·26 days ago

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

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u/marta_ilunga41 points·25 days ago

data logger is the standard, gut feeling is not

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u/kian_ekstromOP31 points·25 days ago

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

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u/coldchain_karenMOD57 points·24 days ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/iman_castellanos33 points·24 days ago

lane reports need origin, destination, carrier, and actual transit days

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u/kian_ekstrom10 points·23 days ago·edited

lane reports need origin, destination, carrier, and actual transit days

Disagree on that part. 98.7% and 98.9% on the same vial is normal.

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u/kian_ekstromOP4 points·23 days ago

lane reports need origin, destination, carrier, and actual transit days Disagree on that part.

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

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u/kian_ekstromOP26 points·23 days ago

Ireland to Ireland: 13 days with JEEP and 6 days with MKM. Same route, different carriers, variance is real.

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u/tomas_lokken15 points·23 days ago

I am going to push back on this slightly.

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u/soren_yildiz26 points·24 days ago

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

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u/mod_cold_roommod · c/coldchain14 points·24 days ago

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

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u/aleksi_eriksen5 points·24 days ago

Strongly agree. Peak temperature is not the whole story.

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u/priya_weiss0 points·24 days ago

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

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u/cato_batista5 points·24 days ago

customs clearance often breaks the cold chain, factor that in

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u/jarno_adeyemi8 points·24 days ago

lyophilised powder is far more forgiving than reconstituted solution

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u/niels_norgaard43 points·26 days ago

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

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u/certified_referenceQC32 points·25 days ago

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

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

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u/bastian_ekstrom22 points·25 days ago

customs clearance often breaks the cold chain, factor that in

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u/noor_cardoso6 points·25 days ago

customs clearance often breaks the cold chain, factor that in

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

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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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