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c/reconstitution·posted 1 months ago by u/nadia_kjaer

units — my 8-week log, condensed into one table

Discussion Clean Column ×3 Slow Clap ×2

Right, the insulin syringe question again, but with numbers this time.

I have 4 data points over 20 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 24, not week 73. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

1,186 up / 277 down81% upvoted51 commentsid 162fmz25 Jun 2026

51 comments

25 in this archive, depth 5

best — the order this archive was captured in

u/alcohol_aversion145 points·1 months ago

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

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u/rasmus_mensah118 points·1 months ago

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

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u/dexa_twice_yearlybody comp34 points·1 months ago

This is correct. 3mL versus 15mL is the common mistake.

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u/ruben_cabrera136 points·1 months ago

Two vials, two different concentrations, forgot which was which, almost made a 20 times error. Now I label everything.

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u/clara_weiss108 points·1 months ago·edited

20mg vial, 1mL water, concentration is 20/1 — write it on the vial afterwards

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[deleted]81 points·1 months ago

[deleted]

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u/viktor_erdogan43 points·1 months ago

stopper coring on the 19th draw because you keep using the same entry point. rotate.

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u/RetaAndRegret218 points·1 months ago

show your working or it is unhelpful

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u/karl_fischer_kev29 points·1 months ago

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

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u/rina_bergstrom64 points·1 months 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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u/sock_puppet_spotter31 points·1 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/karl_fischer_kev-11 points·1 months ago

Half-life is about 168 hours, so steady state lands around week 15–5. Practical consequence: what you feel in week 1 is not what that dose does.

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u/adaeze_cabrera1 point·1 months ago

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

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u/rasmus_mensah20 points·1 months ago

never post a calculation as advice without stating the concentration

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u/india_generic_g9 points·1 months ago

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

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u/oskar_kaufmann0 points·1 months ago

Cosigning.

Adding to this: mg/mL is doing more work than the comment implies.

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u/nadia_kjaerOP1 point·1 months ago

Dead space ate 19 units on a low-volume draw. Tiny impact at 0.25mg, massive impact at 0.5mg.

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u/ledger_modmod · vetting14 points·1 months ago

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

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u/spain_receta0 points·1 months ago

Dead space ate 12 units on a low-volume draw. Tiny impact at 5mg, massive impact at 1.7mg.

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u/rasmus_kuipers10 points·1 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/kavya_radich2 points·1 months ago

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

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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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