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c/reconstitution·posted 1 year ago by u/vito_beaulieu

bacteriostatic water: the version I wish someone had shown me in week 1

PSA Receipts ×4

Genuinely asking, not being difficult.

Everyone in c/cagrilintide repeats that mg/mL is important. I believe it, but I have never seen anyone show why, and when I search I get 5 threads of people agreeing with each other.

Is there a paper? Is there a measurement? Or is this one of those things that is true because it has been repeated since 2023?

I am not trying to be the "source?" guy. I would just like a source.

585 up / 21 down96% upvoted28 commentsid 189uhf2 Jul 2025

28 comments

20 in this archive, depth 4

best — the order this archive was captured in

u/rosa_mensah58 points·1 year ago

Spent 20 weeks confused about concentration math until someone showed me the table. 5mg, 2mL, concentration is 5/2.

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u/ruben_cabrera0 points·1 year ago

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

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u/katrin_marchetti36 points·1 year ago

30mg vial, 2mL water, concentration is 30/2 — write it on the vial afterwards

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u/cardio_endpoint_c20 points·1 year ago

10mg vial, 1mL water, concentration is 10/1 — write it on the vial afterwards

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u/viktor_erdogan16 points·1 year ago

swirl, do not shake, or you are courting oxidation

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u/quiet_reader_996 points·1 year ago

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

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u/reflux_report27 points·1 year ago

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

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u/erez_perrin17 points·1 year 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/lurker_for_years19 points·1 year ago·edited

Slight fix: the number was 99.3, not 93.7. Decimal point, but a fairly consequential one.

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u/ilias_cabrera24 points·1 year ago

Not convinced. The evidence does not support that reading.

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u/aleksi_lehtinen-2 points·1 year ago

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

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u/emil_okwuosa1 point·1 year ago·edited

never post a calculation as advice without stating the concentration

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u/sigrid_kaufmann17 points·1 year ago

dead space is real and the syringe matters

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u/wanjiru_varga10 points·1 year ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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[removed]7 points·1 year ago

[removed by moderator]

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u/hub_opssite staff11 points·1 year ago

swirl, do not shake, or you are courting oxidation

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u/quiet_reader_995 points·1 year ago

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

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u/vito_beaulieuOP8 points·1 year ago

Reconstituted at 3mL when I meant 16mL. Caught it because the units looked wrong. Write the concentration.

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u/ahmed_rasmussen8 points·1 year ago·edited

stopper coring on the 17th draw because you keep using the same entry point. rotate.

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u/tuva_kirchner6 points·1 year ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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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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