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c/coldchain·posted 21 days ago by u/ines_lindqvist

freezing reconstituted product: why the answer is no

Data Sourced ×6 Slow Clap ×2

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

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

I say this having got it wrong for 12 months. My ApoB 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.

1,851 up / 668 down73% upvoted54 commentsid qnovos9 Jul 2026

54 comments

23 in this archive, depth 5

best — the order this archive was captured in

u/marta_ilunga190 points·20 days ago

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

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u/ines_lindqvistOP72 points·19 days ago

Logger trace from my shipment: 19 hours at 30°C. Powder tested 98.1% against 98.0% claim. Tolerates more than the box implies.

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u/emeka_delgado79 points·19 days ago

Yeah, data logger is the only acceptable proof.

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u/ice_pack_auditMOD119 points·19 days ago

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

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u/milos_vestergaard94 points·19 days ago

Removed a chain here.

Yes, exactly this, and it is the bit that took me 60 weeks to accept.

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u/rohan_steiner147 points·19 days ago

Respectfully this is a sample of one presented as a finding.

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u/ines_lindqvistOP77 points·19 days ago

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

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u/elodie_kuipers31 points·18 days ago

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

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u/certified_referenceQC62 points·18 days ago

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

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u/ireland_drugs_pay26 points·18 days ago

data logger is the standard, gut feeling is not

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u/priya_weiss97 points·19 days ago·edited

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

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u/nightowl_injector59 points·20 days ago

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

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u/anjali_tamm45 points·19 days ago

customs clearance often breaks the cold chain, factor that in

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u/nightowl_injector15 points·19 days ago

Which carrier and route?

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u/priya_weiss28 points·19 days ago

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

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u/aleksi_eriksen12 points·19 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/cato_batista9 points·19 days ago

data logger is the standard, gut feeling is not

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u/milan_mensah15 points·19 days ago

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

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u/ines_lindqvistOP8 points·19 days ago

The gel pack lasted 23 hours in a courier van, then liquid. Powder itself fine, the cold chain mostly died in transit.

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[removed]3 points·19 days ago

[removed by moderator]

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u/bastian_ekstrom86 points·20 days ago

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

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u/milos_vestergaard44 points·19 days ago

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

Yes, exactly this, and it is the bit that took me 18 weeks to accept.

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u/brigade_detector27 points·19 days ago

Respectfully this is a sample of one presented as a finding.

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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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