Your doctor will determine the best dosage to fit your needs. But be sure to take the dosage your doctor prescribes for you. The information below describes dosages that are commonly used or recommended. Your doctor will ultimately prescribe the smallest dosage that provides the desired effect. Then they’ll adjust your dosage over time to reach the right amount for you. Your doctor will likely start you on a low dosage. Humalog Mix75/25 contains 75% insulin lispro protamine and 25% insulin lispro. Humalog Mix50/50 contains 50% insulin lispro and 50% insulin lispro protamine. Humalog Mix50/50 and Humalog Mix75/25 come in only the U-100 strength. The U-200 strength is used only for subcutaneous injections. Humalog comes in two strengths: U-100, which contains 100 units of insulin per mL, and U-200, which contains 200 units of insulin per mL. If you have questions about Humalog’s forms, talk with your doctor or pharmacist. Vials containing several dosages of insulin that can be used for injections