Humulin R Vial contains regular human insulin, often referred to as insulin injection USP. It is a short-acting insulin that works quickly to lower blood sugar and is typically used in combination with intermediate- or long-acting insulins for full-day glucose management. The main benefit of Humulin R is its ability to mimic the body’s natural insulin response at mealtimes. By helping glucose move from the bloodstream into cells, it lowers blood sugar after eating. On our website, Humulin R Vial is available in 100 units/mL, packaged as a 10 mL vial.