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 Votes and new comments are closed, and some of the advice in it may have been superseded — check the community wiki for the current version.
1.8k
c/reconstitution·posted 1 year ago by u/runa_cabrera

bacteriostatic water vs units — genuinely asking which matters more

Explainer Cold Box ×3 Well Actually ×1

Confession thread, sort of.

I went from 10mg to 2.5mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 13 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 injection-site soreness I did not need and a data point I cannot interpret. Two lessons in one.

Posting it in the hope that somebody at week 6 reads it before doing the same thing.

2,743 up / 940 down74% upvoted52 commentsid 15hvaz2 May 2025

52 comments

16 in this archive, depth 4

best — the order this archive was captured in

u/swirl_dont_shakereconstitution140 points·1 year ago

This is correct. 2mL versus 11mL is the common mistake.

replysharereportpermalink
u/a1c_arcT2D39 points·1 year ago

show your working or it is unhelpful

replysharereportpermalink
u/yusuf_achebe120 points·1 year ago

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

replysharereportpermalink
u/declared_value_dv74 points·1 year ago

Cosigning.

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

replysharereportpermalink
load more comments (2) →
u/quiet_reader_9954 points·1 year ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

replysharereportpermalink
u/oskar_ibarra20 points·1 year ago

u-100 syringe, not u-40, or your math is off by factor of 7

replysharereportpermalink
u/arne_restrepo5 points·1 year ago

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

replysharereportpermalink
u/viktor_erdogan56 points·1 year ago·edited

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

replysharereportpermalink
u/emil_zamora43 points·1 year ago

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

replysharereportpermalink
u/runa_cabreraOP34 points·1 year ago

swirl, do not shake, or you are courting oxidation

replysharereportpermalink
load more comments (2) →
u/georgi_adebayo31 points·1 year ago

Not convinced. The evidence does not support that reading.

replysharereportpermalink
u/andres_sorensen16 points·1 year ago

Crossposting this to c/survodutide because the people who need it are not reading this community.

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.