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?
Single comment threadYou are looking at one branch of [Meta] proposal — a flair for certificate of analysis posts — 33 comments in the full submission. View in context.
2.2k
c/coa·submitted 3 months ago by u/first_hundred

[Meta] proposal — a flair for certificate of analysis posts

Discussionbranch of 8 comments

I have had 10 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 32 days on nominally the same lane, which matters more in summer than in February. The independent number came back 99.0% against a claimed…

Read the full submission and all 33 comments →

This branch

8 comments, started 3 months ago
u/ismael_eriksen51 points·3 months ago
the Medutest number or it did not happen
replysharereportpermalink
u/alcohol_aversion32 points·3 months ago

the Medutest number or it did not happen

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

replysharereportpermalink
u/yannick_haddad21 points·3 months ago

no "is this good?" without saying what the compound and claimed purity are

replysharereportpermalink
u/andres_restrepo16 points·3 months ago

Batch number and date of analysis? Both are load-bearing.

replysharereportpermalink
u/santiago_szabo21 points·3 months ago

PDF metadata is checkable in fifteen seconds

replysharereportpermalink
u/dario_boateng15 points·3 months ago

PDF metadata is checkable in fifteen seconds

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

replysharereportpermalink
u/nadia_fonseca10 points·3 months ago

Water content on the document? That affects your concentration math.

replysharereportpermalink
u/reflux_report26 points·3 months ago

the counterion is part of the mass you paid for

replysharereportpermalink

← back to the whole thread

About c/coa

How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

71kmembers
130submissions
Aug 2023created
submissions / month, last year
Sponsored

Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

sigmaaldrich.com
More in c/coa
c/coa rules
  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
  2. Redact your own name and order id, not the vendor's batch details.
  3. No "is this good?" without saying what the compound and claimed purity are.
  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.
Full rules and how they are enforced →
Moderators
u/coa_janitoru/purity_pedantu/coa_collectoru/certified_referenceu/first_hundred
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.

Full disclaimer →