Insulin syringes
The needle is fixed and does not come off. The barrel is marked in units, not millilitres. U-100 and U-40 syringes are both this family — they look almost identical but are not interchangeable.
Syringe types
Peptimark offers two families of syringe. Here is how to tell them apart, and why one size is not on the list.
Luer syringes
The needle screws or pushes on and can be swapped. The barrel is marked in millilitres, not units.
Why there is no 3 ml option
A 3 ml syringe marks every 0.1 ml — ten times coarser than the 1 ml Luer syringe, which marks every 0.01 ml. At a typical peptide dose that gap can land an injection more than 15% away from the amount your clinician gave you. Peptimark only lists syringes fine enough to read a peptide dose precisely.