Is a U-100 syringe the only correct syringe?
No. It is the common insulin scale this site uses as the default marks-per-mL value. You can enter another scale in the calculator.
How-to · reviewed 2026-10-09
U-100 units, milliliters and micrograms
U-100 means 100 units fill 1 mL. One unit is 0.01 mL. Mass per unit depends only on how much labeled peptide sits in that milliliter after you add the liquid you chose and after you accept the seller’s labeled milligrams as the mass input. The syringe does not know what you dissolved. Units are volume. Two people can draw “10 units” from the same 10 mg listing and still hold different masses if one added 1 mL and the other added 3 mL.
Units are volume
People talk about “units of BPC” as if the unit were an amount of that peptide. On a U-100 insulin syringe the unit is a volume mark. Ten units is 0.10 mL of whatever is in the barrel. The syringe is a ruler.
If two people add different water volumes to the same 10 mg vial, their “10 units” contain different masses. That is why a units chart is per vial size and per liquid volume.
Reading the barrel
Most U-100 barrels mark every 1 or 2 units. Interpolating below 5 units adds error. If your arithmetic lands on 2 units, the issue is measurement resolution. The page leaves the amount alone.
Tuberculin syringes marked in mL are the same math with the scale written as 0.01 mL instead of 1 unit.
Worked conversions
32 units on U-100 = 0.32 mL.
If concentration is 2000 mcg/mL, 0.32 mL holds 640 mcg of the dissolved labeled mass.
Those numbers are the same multiplication the calculator runs. They do not tell you what to take.
Questions
Do units mean IU?
IU is an international biological unit for some hormones. U-100 units on this site are syringe marks. Different scales.
Sources
Next: BPC-157 calculator or coach weekly review.
These guides explain records and arithmetic. Not medical advice. PepBear does not pick a dose, a cycle, or a seller.