GLPHubglpresearchhub.com
Read-only archive. GLP Research Hub is a static community record — nothing here is for sale, no account is needed, and no vote you cast is counted. Why?
Archived. This submission is more than a year old. Votes and new comments are closed, and some of the advice in it may have been superseded — check the community wiki for the current version.
3.1k
c/coldchain·posted 2 years ago by u/ms_fragmenter

does lyophilised actually matter or is it forum lore at this point

Data Receipts ×4 Sourced ×2 Cold Box ×2

Trying to settle this properly because the thread from last year went in circles.

The claim: packaging matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 19 months without either producing anything.

What would actually settle it is 13 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

3,453 up / 374 down90% upvoted51 commentsid v49ydw18 Dec 2023

51 comments

30 in this archive, depth 6

best — the order this archive was captured in

u/kian_ekstrom301 points·2 years ago

Logger trace from my shipment: 21 hours at 21°C. Powder tested 98.6% against 98.3% claim. Tolerates more than the box implies.

replysharereportpermalink
u/creatine_and_cardio163 points·2 years ago

Logger trace from my shipment: 21 hours at 21°C.

Disagree on that part. 98.1% and 97.6% on the same vial is normal.

replysharereportpermalink
u/maren_sorensen110 points·2 years ago

Logger trace from my shipment: 21 hours at 21°C.

Disagree on that part. 97.4% and 96.2% on the same vial is normal.

replysharereportpermalink
u/ms_fragmenterOP65 points·2 years ago

Which carrier and route?

replysharereportpermalink
u/nightowl_injector45 points·2 years ago

customs clearance often breaks the cold chain, factor that in

replysharereportpermalink
u/phase_two_pete37 points·2 years ago

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

replysharereportpermalink
u/vito_chowdhury208 points·2 years ago

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

replysharereportpermalink
u/ms_fragmenterOP94 points·2 years ago

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

replysharereportpermalink
u/anya_salgado40 points·2 years ago·edited

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

replysharereportpermalink
u/britt_okwuosa76 points·2 years ago·edited

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

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

replysharereportpermalink
u/phase_two_pete31 points·2 years ago

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

replysharereportpermalink
u/tomas_lokken128 points·2 years ago

Half-life is about 168 hours, so steady state lands around week 4–5. Practical consequence: what you feel in week 1 is not what that dose does.

replysharereportpermalink
u/emil_marchand110 points·2 years ago·edited

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

replysharereportpermalink
u/isabela_nilsen46 points·2 years ago

Reconstituted or dry powder?

replysharereportpermalink
u/ms_fragmenterOP35 points·2 years ago

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

replysharereportpermalink
u/jarno_adeyemi11 points·2 years ago

Canada to Canada takes 16 days on average, variance is 6 days

replysharereportpermalink
u/mod_cold_roomMOD49 points·2 years ago

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

replysharereportpermalink
u/sten_palacios-37 points·2 years ago

Removed a chain here.

Yes, exactly this, and it is the bit that took me 81 weeks to accept.

replysharereportpermalink
u/tidy_vialdrawer_watch2857 points·2 years ago

data logger is the standard, gut feeling is not

replysharereportpermalink
u/priya_ogunleye19 points·2 years ago·edited

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

replysharereportpermalink
u/meera_sandvik7 points·2 years ago

customs clearance often breaks the cold chain, factor that in

replysharereportpermalink
u/careful_gradient_again83 points·2 years ago

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

replysharereportpermalink
u/vito_chowdhury38 points·2 years ago

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

replysharereportpermalink
u/ice_pack_auditcold chain0 points·2 years ago

Slight fix: the number was 98.0, not 98.1. Decimal point, but a fairly consequential one.

replysharereportpermalink
u/certified_referenceQC1 point·2 years ago

Slight fix: the number was 98.0, not 98.1.

Yes, exactly this, and it is the bit that took me 84 weeks to accept.

replysharereportpermalink
u/ice_pack_auditcold chain1 point·2 years ago

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

replysharereportpermalink
u/andres_restrepo1 point·2 years ago

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

replysharereportpermalink
u/andres_restrepo31 points·2 years ago

Small correction: the trial was 13 weeks, not 3. Does not change your point but people will quote it.

replysharereportpermalink
u/nils_ferreira10 points·2 years ago

Small correction: the trial was 13 weeks, not 3.

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

replysharereportpermalink
load more comments (1) →
Permalinked branches
Deep branches get their own page so a single reply chain can be linked and read on its own.
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.

27kmembers
95submissions
Oct 2023created
submissions / month, last year
Sponsored

Janoshik Analytical

Independent HPLC and mass spec. The number you get is the number they found.

janoshik.com
Sponsored

GL Biochem (Shanghai)

Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

glbiochem.net
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.
Moderators
Volunteers. Unpaid, unaffiliated, and reachable through modmail only.
Before you read on

Several compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.