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 4 months in and dead space is still the thing I get wrong — 49 comments in the full submission. View in context.
7.2k
c/reconstitution·submitted 6 months ago by u/honest_syringe_2025

4 months in and dead space is still the thing I get wrong

PSAbranch of 11 comments

Posting this because I searched for it and got nothing useful. Setup: 5mg, week 19, constipation present but not ruining anything. I changed exactly one variable — units — and tracked it for 21 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am…

Read the full submission and all 49 comments →

This branch

11 comments, started 6 months ago
u/ismael_nwosu794 points·6 months ago

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

replysharereportpermalink
u/honest_syringe_2025OP544 points·6 months ago

Small correction: the trial was 13 weeks, not 35. Does not change your point but people will quote it.

replysharereportpermalink
u/oskar_ibarra197 points·6 months ago

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

replysharereportpermalink
u/units_not_mgsyringe math158 points·6 months ago

never post a calculation as advice without stating the concentration

replysharereportpermalink
u/honest_syringe_2025OP86 points·6 months ago

This is correct. 2mL versus 21mL is the common mistake.

replysharereportpermalink
u/alcohol_aversion69 points·6 months ago

i am begging people to write down the concentration

replysharereportpermalink
u/ruben_cabrera27 points·6 months ago

This is correct.

Adding to this: insulin syringe is doing more work than the comment implies.

replysharereportpermalink
u/rina_bergstrom48 points·6 months ago

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

replysharereportpermalink
u/honest_syringe_2025OP287 points·6 months ago

Small correction: the trial was 13 weeks, not 35.

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

replysharereportpermalink
[removed]513 points·6 months ago

[removed by moderator]

replysharereportpermalink
u/vito_beaulieu218 points·6 months ago

What was the vial size and how much bac water?

replysharereportpermalink

← back to the whole thread

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.