u/signe_grimaldi

Not quite. Bacteriostatic and sterile water are not interchangeable for a multi-draw vial, and the difference is the preservative.

Yes. Writing 5mg/mL on the vial takes four seconds and removes the entire class of error this board exists to fix.

Right, and the tolerability data in the combination arms is the part worth reading properly rather than summarising.

Research-use-only material is not approved for human use, so treat everything in this thread as arithmetic about solutions rather than instructions for a person.

the number you write down is the number you will trust at 6am

preclinical enthusiasm is not clinical evidence

I would not draw a line through two points, especially when the second was taken at a different time of day.

Is there any independent purity data on this compound that you have seen?

Fasting or not, and what time of day?

This is the sentence to read before anybody panics about a single value.

The lyophilised cake displaces a small volume, so the true concentration is very slightly lower than the arithmetic suggests. It is a fraction of a percent and it is dwarfed by fill tolerance.

The lyophilised cake displaces a small volume, so the true concentration is very slightly lower than the arithmetic suggests. It is a fraction of a percent and it is dwarfed by fill tolerance.

Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire relationship.

Wrote the date on the vial as well as the concentration after losing track of which one was opened first.

Draw at the same point in the week now, fasting, same lab. The noise dropped enormously once I standardised.

Did anything else change in that window — training, intake, hydration?

Panicked about a single result, posted here, got told to repeat it, repeated it, and it was fine.

Is that a U-100 syringe? The barrel markings change the answer completely.