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c/coldchain·posted 2 months ago by u/osman_brandt

[Question] Ireland — has anyone got a straight answer on packaging

Question Clean Column ×5

Long-ish post, sorry. tl;dr at the bottom.

I have been tracking ice pack against triglycerides for 29 weeks because I could not find anyone who had. The correlation is weaker than I expected, which is itself mildly interesting given how confidently people link the two in here.

Caveats up front: one person, one lab, one assay, no control, and I changed my training in the middle of it, which was stupid.

tl;dr: probably real, definitely smaller than the threads imply, and not worth reorganising your week around.

720 up / 197 down79% upvoted21 commentsid 1t7tz012 May 2026

21 comments

19 in this archive, depth 5

best — the order this archive was captured in

u/bastian_ekstrom96 points·2 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/osman_brandtOP40 points·2 months ago

Logger trace from my shipment: 16 hours at 20°C. Powder tested 98.7% against 98.6% claim. Tolerates more than the box implies.

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u/kian_ekstrom76 points·2 months ago·edited

That is net peptide content, not purity. Different number, different meaning.

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u/iman_castellanos-29 points·2 months ago

customs clearance often breaks the cold chain, factor that in

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u/zeynep_ndiaye1 point·2 months ago

gel packs last 24 hours, after that you are relying on the box itself

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u/osman_brandtOP1 point·2 months ago

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

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u/split_dose_sceptic40 points·2 months ago

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

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u/anya_salgado60 points·2 months ago

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

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u/osman_brandtOP0 points·2 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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

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u/priya_weiss1 point·2 months ago

lyophilised powder is far more forgiving than reconstituted solution

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u/nightowl_injector1 point·2 months ago

Strongly agree. Peak temperature is not the whole story.

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u/salma_vasquez1 point·2 months ago·edited

gel packs last 23 hours, after that you are relying on the box itself

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[removed]1 point·2 months ago

[removed by moderator]

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u/anjali_tamm74 points·2 months ago

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

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u/mod_cold_roomMOD47 points·2 months ago

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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u/honest_syringe3323 points·2 months ago

Strongly agree. Peak temperature is not the whole story.

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u/chidi_yilmaz15 points·2 months ago

Strongly agree.

Disagree on that part. 97.4% and 97.9% on the same vial is normal.

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u/emil_marchand24 points·2 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/runa_wikstrom18 points·2 months ago

Customs clearance took 6 days. Package sat unrefrigerated during that. Powder tested clean after, reconstituted solution probably would not have.

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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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