Insulin lispro and regular human insulin are Food and Drug Administration (FDA)-approved medications for the treatment of diabetes mellitus. Recombinant human hyaluronidase (rHuPH20) is approved by the FDA as an aid to the absorption and dispersion of other injectable drugs. In this study, rHuPH20 will be co-administered with both insulin lispro and regular human insulin in order to determine if it improves the absorption of these insulins to more closely mimic the body's natural increase in insulin in response to a meal.

The purpose of this study is to compare the pharmacokinetics (absorption, distribution, breakdown and elimination) of regular human insulin + recombinant human hyaluronidase (rHuPH20) versus insulin lispro alone, and to compare the pharmacokinetics of insulin lispro + rHuPH20 versus insulin lispro alone. The effects of regular human insulin + rHuPH20, insulin lispro + rHuPH20, and insulin lispro alone on the body will be evaluated by blood glucose measurements and by calculating the rate at which a glucose solution is infused to maintain blood glucose within a certain range. The safety and tolerability of insulin lispro with and without rHuPH20 and regular human insulin with rHuPH20 will be studied. The study drugs will be administered by subcutaneous (under the skin) injection.

Inclusion Criteria:

• Healthy participants between the ages of 18 and 55 years, inclusive. (Healthy is defined as no clinically relevant abnormalities.)
• Body mass index (BMI) between 18-27 kilograms per meter squared (kg/m^2), inclusive.
• Total body weight >65 kilograms (kg) (143 pounds [lb]) for men and >46 kg (101 lb) for women.
• Decision making capacity and willingness to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures including adequate venous access.
• Vital signs (blood pressure, pulse rate, body temperature) within normal range or, if out of range, assessed by the Principal Investigator (PI) as not clinically significant (NCS).
• Fasting blood glucose level <100 milligrams per deciliter (mg/dL) at screening.
• A negative serum pregnancy test (if female of childbearing potential).
• Female participants of childbearing potential must agree to be practicing effective birth control or abstinence currently and agree to continue to do so for the duration of their time on study.
• Signed, written Institutional Review Board (IRB)-approved informed consent.

Exclusion Criteria:

• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, oncologic, or neurologic (to include history of seizures) disease; hypoglycemic episodes; intercurrent illness (such as influenza); or allergic disease (including severe drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing). Clinical significance to be determined by the PI.
• As judged by the Investigator, clinically significant findings in routine laboratory data. (Anemia with hematocrit less than 33% at screening is specifically exclusionary.)
• Known history of diabetes mellitus (type 1 or type 2) or gestational diabetes.
• Known allergy to hyaluronidase or any other ingredient in the study drug.
• Positive human immunodeficiency virus (HIV 1) antibody test, hepatitis B (anti-hepatitis B surface antigen [anti-HBsAg]) or hepatitis C (anti-hepatitis C virus [anti-HCV]) antibody test.
• History or evidence of alcohol or drug abuse.
• History or evidence of use of any tobacco or nicotine-containing product within 6 months of screening and a screening qualitative urine nicotine test.
• Use of drugs that may interfere with the interpretation of trial results or are known to cause clinically relevant interference with insulin action or glucose utilization.
• Donation of blood in excess of 500 milliliters (mL) within 56 days before dosing.
• Participation in a study of any investigational drug or device 30 days before enrollment in this study.
• The participant is unfit for the study in the opinion of the Investigator.
• Women who are pregnant or breast-feeding.