Participants clarify that syringe lines show volume in units for U-100 insulin only, while IUs measure biological potency and vary by substance. Examples show how to convert between the two when reconstituting HGH, and some note that IUs account for batch potency differences unlike simple volume measures. The thread stresses that one IU does not equal the same mass across compounds like insulin, vitamin D, or oxytocin.
What this discussion establishesWhether syringe markings can be called IUs even for standard insulin, or if that usage is always imprecise
Still openWhether common peptide calculators correctly handle IU-based dosing for HGH
Nothing here is advice.
Just a quick note since I keep seeing people call the marks on their syringes IUs. They are actually just units. IUs stand for international units and track potency for things like HGH or insulin, while units track volume.
Are we talking about the same insulin syringes that have marks precisely so you can measure IU amounts of insulin? If the concentration is the standard one, then people using those marks for insulin IUs are right.
For U-100 insulin at 100 IU per ml they really are IUs. Units themselves are not truly a volume measurement; we treat them that way only because U-100 supplies are everywhere and convenient.
I wonder why every HGH listing shows IUs. Isn't it supplied the same way as other peptides?
IUs get used when the biological activity or strength per milligram can change depending on how something was made or from one batch to the next.
After going through this whole thread I am more lost than before. So the same syringes I already use for other peptides will work for HGH as well? Are the IU per ml values just interchangeable?
Suppose a vial holds 24 IUs of HGH. Add 2.4 ml of bac water and then 20 units, which is 0.2 ml, will deliver 2 IUs.
Interesting discussion. Quick recap: one unit on a U-100 syringe equals 0.01 ml. IUs measure dose for insulin, vitamin D, HCG, HGH, and oxytocin. One IU of insulin matches one U-100 unit, while one IU of oxytocin is roughly 2 mcg, one IU of insulin about 0.0347 mcg, and one IU of vitamin D is 0.025 mcg.
Do the usual peptide calculators account for this distinction?
Most do not. Separate tools exist just for HGH dosing.
The numbers printed on syringes simply drop the leading zero and decimal to make the scale easier to read and reduce mistakes. So 50 units means 0.50 ml, 20 units means 0.20 ml, and so on. Without knowing concentration you still cannot know the actual amount present. Volume alone never tells you quantity.
If you have tried it, this topic is still open. Sign in to reply — it takes a minute.