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 Votes and new comments are closed, and some of the advice in it may have been superseded — check the community wiki for the current version.
6.4k
c/reconstitution·posted 1 year ago by u/rasmus_mensah

[Meta] proposal — a flair for bacteriostatic water posts

PSA The Quiet One ×3 Sourced ×2 Receipts ×1

mg/mL. That is the whole post, but I will justify it.

Everything else people worry about in c/intlshipping is downstream of it. Titration speed, early fullness, the endless dose arguments — most of it resolves if you sort mg/mL out first, and almost nobody does.

I say this having got it wrong for 17 months. My eGFR was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.

6,978 up / 613 down92% upvoted51 commentsid 17pva121 Jul 2025

51 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/emil_zamora755 points·1 year ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

replysharereportpermalink
u/declared_value_dv211 points·1 year ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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

replysharereportpermalink
u/sock_puppet_spotter65 points·1 year ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

replysharereportpermalink
u/rasmus_mensahOP495 points·1 year ago

Cored the stopper on my 5th draw because I kept using the same entry point. Rotate the puncture site.

replysharereportpermalink
u/anya_antonsen-15 points·1 year ago

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

replysharereportpermalink
u/adaeze_cabrera1 point·1 year ago

i am begging people to write down the concentration

replysharereportpermalink
[deleted]1 point·1 year ago

[deleted]

replysharereportpermalink
u/julia_erdogan1 point·1 year ago

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

replysharereportpermalink
u/ines_ekstrom1 point·1 year ago

Slight fix: the number was 98.7, not 98.9. Decimal point, but a fairly consequential one.

replysharereportpermalink
u/zaid_balogun1 point·1 year ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

replysharereportpermalink
u/signe_grimaldi391 points·1 year ago

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

replysharereportpermalink
u/honest_syringe_maybe259 points·1 year ago

never post a calculation as advice without stating the concentration

replysharereportpermalink
u/nadia_kjaer328 points·1 year ago

Are you using a u-100 or u-40 syringe?

Yes, exactly this, and it is the bit that took me 95 weeks to accept.

replysharereportpermalink
u/tuva_kirchner109 points·1 year ago·edited

Small correction: the trial was 11 weeks, not 14. Does not change your point but people will quote it.

replysharereportpermalink
u/swirl_dont_shakeMOD420 points·1 year ago

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

replysharereportpermalink
u/sigrid_kaufmann223 points·1 year ago

never post a calculation as advice without stating the concentration

replysharereportpermalink
u/katrin_marchetti240 points·1 year ago
this is the answer
replysharereportpermalink
u/nabila_espinoza192 points·1 year ago·edited

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

replysharereportpermalink
u/rosa_mensah181 points·1 year ago

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

replysharereportpermalink
u/hub_opssite staff211 points·1 year ago

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

replysharereportpermalink
u/priya_weiss172 points·1 year ago·edited

This is correct. 1mL versus 24mL is the common mistake.

replysharereportpermalink
u/rasmus_mensahOP63 points·1 year ago

Reconstituted at 3mL when I meant 23mL. Caught it because the units looked wrong. Write the concentration.

replysharereportpermalink
u/rasmus_mensah106 points·1 year ago

show your working or it is unhelpful

replysharereportpermalink
u/yusuf_achebe52 points·1 year ago

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

replysharereportpermalink
u/swirl_dont_shakereconstitution63 points·1 year ago

Show the arithmetic. Where did the units come from?

replysharereportpermalink
u/runa_cabrera33 points·1 year ago

10mg vial, 2mL water, concentration is 10/2 — write it on the vial afterwards

replysharereportpermalink
u/units_not_mgsyringe math134 points·1 year ago

Cored the stopper on my 3th draw because I kept using the same entry point. Rotate the puncture site.

replysharereportpermalink
u/marta_weiss65 points·1 year ago

more water means more units for the same dose, which means finer resolution

replysharereportpermalink
u/runa_grimaldi45 points·1 year ago

This is correct. 2mL versus 20mL is the common mistake.

replysharereportpermalink
u/cesar_ivaturi80 points·1 year ago

Is that 30mg vial or 14mg?

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

PeptideMeter Analytics

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

peptidemeter.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.