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

lyophilised vs stability — genuinely asking which matters more

Explainer Cold Box ×9 Sourced ×2 Long Haul ×2

data logger. That is the whole post, but I will justify it.

Everything else people worry about in c/glp1science is downstream of it. Titration speed, muscle cramps, the endless dose arguments — most of it resolves if you sort data logger out first, and almost nobody does.

I say this having got it wrong for 14 months. My triglycerides was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.

6,637 up / 383 down95% upvoted39 commentsid q34jp81 Sep 2024

39 comments

30 in this archive, depth 4

best — the order this archive was captured in

u/ines_lindqvist945 points·1 year ago

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

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u/sten_palacios250 points·1 year ago

Sceptical. If this were true we would see it reflected in the data and we do not.

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u/tidy_vialdrawer_watch28-32 points·1 year ago

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

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u/kian_ekstrom1 point·1 year ago

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

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u/anya_salgado603 points·1 year ago

You have restated the marketing copy. What is the actual substance here.

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[removed]437 points·1 year ago

[removed by moderator]

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u/ms_fragmenterOP253 points·1 year ago

lyophilised powder is far more forgiving than reconstituted solution

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u/ms_fragmenterOP437 points·1 year ago

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

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u/coldchain_karencold chain623 points·1 year ago

Logger trace from my shipment: 10 hours at 31°C. Powder tested 99.3% against 93.7% claim. Tolerates more than the box implies.

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u/analog_alphabet480 points·1 year ago

Logger trace from my shipment: 7 hours at 7°C. Powder tested 94.2% against 97.9% claim. Tolerates more than the box implies.

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u/usb_logger_ursulaMOD231 points·1 year ago

Removed a chain here. The rule is one line long and it is not negotiable.

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u/maren_sorensen159 points·1 year ago

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

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u/kian_solberg91 points·1 year ago

lyophilised powder is far more forgiving than reconstituted solution

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u/analog_alphabet41 points·1 year ago

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

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u/lina_almeida184 points·1 year ago

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

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u/chidi_abubakar79 points·1 year ago

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

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

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u/marit_laurent30 points·1 year ago

France to France takes 5 days on average, variance is 8 days

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u/usb_logger_ursula220 points·1 year ago

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

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u/source_or_silence171 points·1 year ago·edited

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/meera_sandvik101 points·1 year ago

data logger is the standard, gut feeling is not

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u/hugo_bergstrom117 points·1 year ago

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

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u/ms_fragmenterOP84 points·1 year ago

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

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u/intent_to_treat32 points·1 year ago

lyophilised powder is far more forgiving than reconstituted solution

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u/nils_ferreira108 points·1 year ago

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

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u/intent_to_treat29 points·1 year ago

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

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u/source_or_silence12 points·1 year ago

Yeah, data logger is the only acceptable proof.

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u/priya_guerrero81 points·1 year ago

gel packs last 13 hours, after that you are relying on the box itself

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u/kofi_ferreira74 points·1 year ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/runa_wikstrom103 points·1 year ago

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

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u/emeka_delgado60 points·1 year ago·edited

Denmark to Denmark: 18 days with QSC and 29 days with FGP. Same route, different carriers, variance is real.

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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.
  4. Independent community. Nobody here sells anything, and anyone who tries is banned.
  5. Not medical advice. Describe what you did; never prescribe to a stranger.
  6. Claims need evidence. Batch numbers, dated screenshots, independent test reports, or a citation.
  7. No referral links, discount codes or affiliate URLs. Permanent ban, no appeal.
  8. No contact handles, wallet addresses or tracking numbers — they identify people.
  9. Be recognisably decent. Disagree hard, insult nobody.
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