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c/reconstitution·posted 10 days ago by u/sigrid_kaufmann

[Math] someone check my arithmetic before i draw this up

Math Clean Column ×6

Posting this because I searched for it and got nothing useful.

Setup: 0.5mg, week 2, sulphur burps present but not ruining anything. I changed exactly one variable — mg/mL — and tracked it for 9 weeks.

Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am putting it here rather than presenting it as a finding. If two or three other people have done the same thing we might actually learn something.

Not medical advice, obviously. This is one person with a spreadsheet.

1,040 up / 211 down83% upvoted41 commentsid inoq6a19 Jul 2026

41 comments

24 in this archive, depth 4

best — the order this archive was captured in

u/bac_water_banditreconstitution59 points·9 days ago
came here to say exactly this
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u/cesar_ivaturi48 points·8 days ago

The confident tone is doing a lot of work that the evidence is not.

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u/ismael_nwosu-12 points·8 days ago

show your working or it is unhelpful

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u/yusuf_nakamura1 point·7 days ago

show your working or it is unhelpful

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

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u/sigrid_kaufmannOP1 point·8 days ago

Reconstituted at 3mL when I meant 21mL. Caught it because the units looked wrong. Write the concentration.

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u/reflux_report1 point·8 days ago

Small correction: the trial was 4 weeks, not 38. Does not change your point but people will quote it.

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u/adaeze_cabrera1 point·7 days ago

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

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u/vito_beaulieu36 points·10 days ago

Mechanistically the bit that matters is bacteriostatic water. It explains most of the early profile and a decent chunk of the outcome.

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[removed]27 points·9 days ago

[removed by moderator]

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u/india_generic_g12 points·9 days ago

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

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u/honest_syringe_maybe3 points·9 days ago·edited

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

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

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u/oskar_ibarra21 points·9 days ago

Show the arithmetic. Where did the units come from?

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u/sigrid_kaufmann0 points·9 days ago

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

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u/nadia_kjaer28 points·9 days ago

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

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u/hub_opssite staff21 points·9 days ago

Is that 5mg vial or 21mg?

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u/sigrid_kaufmannOP8 points·9 days ago

Two vials, two different concentrations, forgot which was which, almost made a 3 times error. Now I label everything.

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u/georgi_adebayo29 points·9 days ago

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

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u/quarter_dose_queenlow and slow17 points·9 days ago
source?
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u/cardio_endpoint_c6 points·9 days ago·edited

never post a calculation as advice without stating the concentration

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u/arto_falk4 points·9 days ago

What was the vial size and how much bac water?

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u/erez_perrin3 points·9 days ago

dead space is real and the syringe matters

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u/bac_water_banditreconstitution1 point·9 days ago

What was the vial size and how much bac water?

Disagree on that part. 95.1% and 96.2% on the same vial is normal.

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u/arne_restrepo12 points·9 days ago
i wish i had read this 24 months ago
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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.

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