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?
Locked. A moderator closed replies on this one. It stays up because the content above the argument is worth keeping.
195
c/reconstitution·posted 6 months ago by u/soren_zamora

France: mg/mL, and what it actually costs here

Discussion

Right, the units question again, but with numbers this time.

I have 5 data points over 30 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 34, not week 83. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

203 up / 8 down96% upvoted17 commentsid apf33h25 Jan 2026

17 comments

15 in this archive, depth 5

best — the order this archive was captured in

u/rosa_mensah47 points·6 months ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

replysharereportpermalink
u/liv_nkemelu26 points·6 months ago

Show the arithmetic. Where did the units come from?

replysharereportpermalink
load more comments (1) →
u/katrin_marchetti23 points·6 months ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

replysharereportpermalink
[deleted]16 points·6 months ago

[deleted]

replysharereportpermalink
u/piotr_bruun21 points·6 months ago

the concentration on the vial in marker is the most important step

replysharereportpermalink
u/rasmus_kuipers10 points·6 months ago·edited

Cosigning. The concentration on the vial in marker is load-bearing.

replysharereportpermalink
u/sigrid_kaufmann6 points·6 months ago

I am going to push back on this slightly.

replysharereportpermalink
u/swirl_dont_shakeMOD3 points·6 months ago

Retitled to remove editorialising. Put the evidence in the body.

replysharereportpermalink
u/a1c_arcT2D2 points·6 months ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

replysharereportpermalink
u/oskar_ibarra2 points·6 months ago

20mg vial, 2mL water, concentration is 20/2 — write it on the vial afterwards

replysharereportpermalink
u/katrin_marchetti1 point·6 months ago

Are you using a u-100 or u-40 syringe? That changes everything.

replysharereportpermalink
u/rasmus_kuipers-13 points·6 months ago

stopper coring on the 13th draw because you keep using the same entry point. rotate.

replysharereportpermalink
u/piotr_bruun1 point·6 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

replysharereportpermalink
u/soren_zamora1 point·6 months ago

Slight fix: the number was 99.1, not 93.7. Decimal point, but a fairly consequential one.

replysharereportpermalink
Permalinked branches
Deep branches get their own page so a single reply chain can be linked and read on its own.
About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

88kmembers
130submissions
Aug 2023created
submissions / month, last year
Sponsored

Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

sigmaaldrich.com
c/reconstitution rules
  1. Show your numbers. "How many units?" with no mg and no mL cannot be answered.
  2. Never post a calculation as advice without stating the concentration it assumes.
  3. No sterile-compounding-for-others discussion. Personal handling only.
  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.