Most peptide research is conducted using standard U-100 Insulin Syringes. These tools are ubiquitous, cheap, and precise. However, reading them correctly is vital to ensuring your subject receives the intended dose.
The Standard Definition
100 Units = 1 Milliliter (ml) = 1 cc
Therefore: 1 Unit = 0.01 ml
Identifying Your Syringe Size
Not all syringes look the same. The total capacity determines how many "tick marks" are printed on the barrel.
The 1.0ml (1cc) Syringe
Usually numbered every 10 units (10, 20, 30...). Between the numbers, there are smaller tick marks. typically, each small tick represents 2 Units. Be careful! It is hard to measure odd numbers (e.g. 5 units) on these.
The 0.5ml (1/2cc) Syringe
Holds 50 units total. Often has tick marks for every 1 Unit. This is preferred for doses under 50 units as it offers better readability.
The 0.3ml (1/3cc) Syringe
Holds 30 units total. Offers the highest precision, often with wide spacing between single unit marks.
How to Draw Accurately
- Push Air In: If you need to draw to the "10" mark, first draw the plunger to "10" with just air, and inject that air into the vial. See our peptide reconstitution guide for more.
- Draw Past, Then Push: Draw slightly more liquid than you need (e.g. to the 15 mark). Tap the syringe to dislodge bubbles. Then slowly push the plunger up to your target line (the 10 mark).
- Read the Top Ring: The black rubber plunger tip usually has two rings. Read the line corresponding to the top ring (closest to the needle), not the bottom one.
Confused about the mass? Check out our mcg vs mg conversion guide or use the ultimate reconstitution calculator. Also, learning how to calculate peptide concentration helps map volume to mass. Finally, consider visualizing dosing charts to track your accuracy.