The primary objective is to assess the speed of absorption of BIOD-123 and BIOD-125 and compare them to Humalog.

The primary objective is to assess the speed of absorption of BIOD-123 and BIOD-125 and compare them to Humalog.

The secondary objectives are to assess other pharmacokinetic characteristics of BIOD-123 and BIOD-125 and compare those to Humalog®, to assess pharmacodynamic characteristics of BIOD-123 and BIOD-125 and compare those to Humalog®, and to evaluate the safety and tolerability of BIOD-123 and BIOD-125 compared to Humalog®

Inclusion Criteria:

1. Age: ≥18 - ≤70 years
2. BMI: ≥18 - ≤30 kg/m2
3. Diagnosed with type 1 diabetes mellitus for at least 1 year
4. Insulin antibody ≤10 μU/mL at screening

Exclusion Criteria:

1. Type 2 diabetes mellitus
2. History of >2 severe hypoglycemic events within the 3 months prior to screening
3. Serum C-peptide >1.0 ng/mL
4. Hemoglobin A1c (HbA1c) >10.0%
5. Females who were breast feeding, pregnant, or intending to become pregnant during the study
6. A sexually active person who was not using adequate contraceptive methods
7. Positive serology for human immunodeficiency virus (HIV), Hepatitis B, or Hepatitis C
8. Abnormal ECG, safety lab, or physical examination results that were deemed clinically significant by the investigator