U-100 Syringe
A U-100 syringe is an insulin syringe calibrated at 100 units per milliliter, where 1 unit equals 0.01 mL. It is the most common syringe type used in research peptide dosing.
Overview
U-100 refers to the insulin concentration standard of 100 units per milliliter — a calibration adopted globally for human insulin. The syringes designed for U-100 insulin are the de facto standard for research peptide administration because they are widely available in 0.3 mL, 0.5 mL, and 1 mL sizes with fine 28G–31G needles ideal for subcutaneous injection. When calculating peptide dose in syringe units on a U-100 syringe: Units = (Dose in mcg ÷ Concentration in mcg/mL) × 100. Because U-100 math is assumed by default in most peptide calculator tools, always confirm syringe type before applying any unit calculation.
Related Terms
Related Calculators
Frequently asked questions
What sizes do U-100 insulin syringes come in?+
Common sizes are 0.3 mL (30 units), 0.5 mL (50 units), and 1 mL (100 units). The needle length is typically 4–8 mm, appropriate for subcutaneous injection.
How do I calculate units on a U-100 syringe for a 250 mcg dose at 2,500 mcg/mL?+
Volume = 250 ÷ 2,500 = 0.1 mL. Units = 0.1 × 100 = 10 units on a U-100 syringe.
Are U-100 syringes the same as standard insulin syringes?+
Yes. In the US and most countries, standard insulin syringes are U-100 calibrated. Always check the packaging label to confirm.