A Phase 1, single-center, randomized, double-blind, placebo-controlled study to evaluate the safety, tolerability, and pharmacodynamics of single and multiple dose regimens of SYNT-101 in healthy and overweight adults.

Inclusion Criteria:

• Must be able to understand the full nature and purpose of the study, including possible risks and adverse effects.
• Adult males and females, 18 to 55 years of age (inclusive) at screening.
• Medically healthy (in the opinion of the PI or delegate), as determined by pre-study medical history, and without clinically significant (CS) abnormalities.
• Have suitable venous access for blood sampling.
• Willing and able to comply with all study assessments and adhere to the protocol schedule and restrictions.

Exclusion Criteria:

• Known hypersensitivity to the study drug or any of the study drug ingredients.
• History of anaphylaxis or other significant allergy which, in the opinion of the PI (or delegate), would interfere with the volunteer's ability to participate in the study.
• History or presence of CS cardiovascular, pulmonary, hepatic, renal, haematological, endocrine, immunologic, dermatologic, psychiatric, or neurological disease/disorder, including any acute illness, within the past 3 months determined by the PI (or delegate) to be clinically relevant.