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 19 months in and purity is still the thing I get wrong — 37 comments in the full submission. View in context.
4.9k
c/coa·submitted 11 months ago by u/tidy_vialdrawer_watch

19 months in and purity is still the thing I get wrong

COAbranch of 6 comments

Confession thread, sort of. I went from 2.5mg to 1.0mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 15 weeks later, at which point I had no way of knowing whether the dose increase did anything or whether it would have broken anyway. So now I have…

Read the full submission and all 37 comments →

This branch

6 comments, started 11 months ago
u/dario_boateng434 points·11 months ago·edited

Asked TFC for the batch-specific COA and they sent it within six hours, full document, batch number, date, everything. That is the baseline.

replysharereportpermalink
u/tidy_vialdrawer_watchOP309 points·11 months ago

Sent one vial to PeptideMeter and VendorInvestigate. 96.8% and 99.1%. Cost me more than the vial did and I would do it again.

replysharereportpermalink
u/sig_figs_sammod · analytical344 points·10 months ago·edited

the method line is doing real work, not just window dressing

replysharereportpermalink
u/tidy_vialdrawer_watchOP178 points·10 months ago

Did they give you the chromatogram or just the summary line?

replysharereportpermalink
u/tidy_vialdrawer_watch137 points·10 months ago·edited

This is the correct framing. The COA structure matters as much as the number.

replysharereportpermalink
u/dario_vermeulen57 points·10 months ago

the method line is doing real work, not just window dressing

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

PeptideMeter Analytics

Independent testing plus vendor-level trend data. Community-funded, unaffiliated.

peptidemeter.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 →