A Study of LY4355756 in Healthy Participants

Inclusion Criteria:

* Are overtly healthy as determined by medical evaluation, including medical history, physical examination, laboratory tests, electrocardiogram (ECGs), and vital signs
* Have a body mass index within the range 18.0-32.0 kilograms per square meter (kg/m²) (inclusive)
* Individuals assigned male at birth (AMAB) or assigned female at birth (AFAB)

  * Contraceptive use by participants should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies

Exclusion Criteria:

* Have presence of significant uncontrolled respiratory, cerebrocardiovascular, cardiovascular, hepatic, renal, gastrointestinal, endocrine, hematologic, neurologic, or psychiatric disorders, or abnormal laboratory values at screening
* Have an abnormality in 12-lead ECG at screening that, in the opinion of the investigator, may increase the risk associated with participating in the study or may confound ECG data analysis
* Have a diagnosis or history of malignancy within 5 years prior to screening

  * Exceptions:

    * basal cell or squamous epithelial carcinomas of the skin that have been resected with no evidence of metastatic disease for 3 years
    * cervical carcinoma in situ, with no evidence of recurrence within the 5 years prior to screening
* Have had breast cancer within the past 10 years
* Have a history or presence of multiple or severe allergies, or an anaphylactic reaction, to prescription or nonprescription drugs or food
* Have a current or recent acute, active infection. For at least 30 days before screening and up to the randomization visit, participants must have no symptoms or signs of confirmed or suspected infection and must have completed any appropriate anti-infective treatment
* Have a current infection with hepatitis B virus (HBV), hepatitis C virus (HCV), and human immunodeficiency virus (HIV)
* Have received any live (including attenuated live vaccines), non-live, or inactivated vaccine(s) within less than 4 weeks before randomization or intend to receive them during the study
* Are individuals AFAB who, during the study, are pregnant, have positive pregnancy testing, intend to become pregnant, are lactating, or intend to breastfeed