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c/coldchain·posted 5 days ago by u/kian_ekstrom

[Failure] gel pack arrived liquid and warm. photos at unboxing.

Failure Well Actually ×1

Posting this because I searched for it and got nothing useful.

Setup: 0.25mg, week 20, sulphur burps present but not ruining anything. I changed exactly one variable — excursion — and tracked it for 15 weeks.

Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am putting it here rather than presenting it as a finding. If two or three other people have done the same thing we might actually learn something.

Not medical advice, obviously. This is one person with a spreadsheet.

532 up / 62 down90% upvoted20 commentsid 1n8pco24 Jul 2026

20 comments

20 in this archive, depth 4

best — the order this archive was captured in

u/nayeli_iyer27 points·5 days ago

Do you have the logger trace?

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u/chidi_yilmaz-26 points·5 days ago

Not to be pedantic but stability and ice pack are being used interchangeably and they are not interchangeable in real life.

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u/gustav_vermeulen39 points·5 days ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/kian_ekstromOP18 points·5 days ago

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

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u/hugo_bergstrom30 points·4 days ago

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

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u/creatine_and_cardio12 points·4 days ago

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/kian_ekstromOP8 points·4 days ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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u/kian_ekstromOP17 points·4 days ago

The gel pack lasted 18 hours in a courier van, then liquid. Powder itself fine, the cold chain mostly died in transit.

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u/hamza_weiss9 points·4 days ago

The confident tone is doing a lot of work that the evidence is not.

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u/lina_almeida6 points·3 days ago

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

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u/aleksi_eriksen5 points·3 days ago·edited

Yeah, data logger is the only acceptable proof.

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u/fatima_yildiz6 points·5 days ago·edited

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

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u/kenji_demir2 points·5 days ago

Peak temperature and how long at that temperature?

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u/anders_karlsen1 point·4 days ago

gel packs last 5 hours, after that you are relying on the box itself

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u/lina_almeida6 points·4 days ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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u/low_appetite_lisa5 points·4 days ago·edited

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

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u/rohan_steiner4 points·4 days ago

Disagree. What you are describing is consistent with packaging, not with what you concluded.

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u/solene_abubakar1 point·4 days ago

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

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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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  5. Not medical advice. Describe what you did; never prescribe to a stranger.
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