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 mg ÷ mL, that is the whole formula, why did i find this hard — 30 comments in the full submission. View in context.
1.1k
c/reconstitution·submitted 3 days ago by u/cesar_ivaturi

mg ÷ mL, that is the whole formula, why did i find this hard

Discussionbranch of 11 comments

Something I noticed reading old threads that I have not seen said out loud. The advice on units in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the…

Read the full submission and all 30 comments →

This branch

11 comments, started 3 days ago
u/georgi_adebayo51 points·3 days ago

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

replysharereportpermalink
u/cesar_ivaturiOP20 points·2 days ago

Disagree. What you are describing is consistent with mg/mL, not with what you concluded.

replysharereportpermalink
u/ruben_cabrera16 points·2 days ago·edited

Disagree.

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

replysharereportpermalink
u/erez_perrin4 points·2 days ago

show your working or it is unhelpful

replysharereportpermalink
u/hub_opssite staff3 points·1 days ago

This is correct. 2mL versus 9mL is the common mistake.

replysharereportpermalink
u/honest_syringe_maybe25 points·2 days ago

stopper coring on the 6th draw because you keep using the same entry point. rotate.

replysharereportpermalink
u/honest_syringe_202515 points·2 days ago

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

replysharereportpermalink
u/elin_ferrari22 points·1 days ago

i am begging people to write down the concentration

replysharereportpermalink
u/sigrid_kaufmann17 points·2 days ago

stopper coring on the 15th draw because you keep using the same entry point. rotate.

replysharereportpermalink
u/cesar_ivaturiOP7 points·2 days ago

This is correct. 3mL versus 4mL is the common mistake.

replysharereportpermalink
u/ismael_nwosu29 points·2 days ago

Is that 15mg vial or 4mg?

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

Janoshik Analytical

Independent HPLC and mass spec. The number you get is the number they found.

janoshik.com
Sponsored

GL Biochem (Shanghai)

Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

glbiochem.net
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.