the units question that gets asked weekly, answered properly
Posting this as a discussion rather than a claim: the units question that gets asked weekly, answered properly.
Shook the first vial because nobody told me not to. It was fine, but I have swirled every one since.
I keep a laminated card in the drawer with the arithmetic on it. Looks ridiculous. Has never once let me draw the wrong volume.
Spent 11 weeks confused about this until somebody drew the table for me. 10mg, 3mL, 3.33mg/mL, 1mg is 30 units. That is the whole thing.
Happy to answer the boring questions. Those are usually the ones worth asking.
best — the order this archive was captured in
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.
Reminder: this board does maths, not dosing. Nobody here tells another member what amount to take.
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
Correction: that gives 5 units, not what you have written. 15mg into 3mL is 5mg/mL and the division follows from there.
Correction: that gives 5 units, not what you have written.
This is the sentence that makes the rest unnecessary. Write it on the vial and the problem is gone.
The arithmetic in full: concentration is mass over volume, so 10mg into 2mL gives 5mg/mL. A U-100 syringe is graduated at 100 units per millilitre, so 5mg is 5 divided by 5 millilitres, which is 100 units.
What is written on the vial right now?
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.