A Study to Investigate the Safety, Tolerability, and Pharmacokinetics and Pharmacodynamics Following Subcutaneous Injections of PG-102 (MG12) in Healthy Adult and Obesity Participants.

Part A (SAD):

In Part A, subjects will receive a single dose of study drug, and the safety and efficacy of PG-102(MG12) will be evaluated in healthy subjects.

Part B (MAD):

In Part B, subjects will receive once-weekly doses of the study drug for 4 weeks, and the safety and efficacy of PG-102(MG12) will be evaluated in otherwise healthy overweight adult subjects.

Part C (MAD):

In Part C, obese participants will receive five repeated subcutaneous doses of the study drug, and the safety and tolerability of PG-102 (MG12) will be assessed across two cohorts based on prior safety data from Part B.

Inclusion criteria

• Male or female participants, aged 18 to 65 years inclusive at the time of signing informed consent
• Body mass index (BMI) of 18 to 30kg/m2 (inclusive) for Part A, Body mass index (BMI) of 25 to 30kg/m2 (inclusive) for Part B and Body mass index (BMI) 30 kg/m² or higher for Part C

[Exclusion Criteria]

• History of administration of prescription drugs, herbal medicines, over-the-counter drugs, or vitamin supplements within 10 days prior to the study or history of the following drugs and/or other foods within 90 days prior to screening:

• Drugs that affect body weight (such as obesity medications, psychiatric drugs, beta blockers, diuretics, contraceptives, female hormones, proton-pump inhibitors (PPIs), H2 receptor antagonists, health functional foods/supplements, and formulas designed for weight control).
• Drugs that have the potential to impact blood sugar, liver fat, and intestinal microorganisms (including GLP-1 receptor agonists, DPP-4 inhibitors, SGLT-2 inhibitors, thiazolidinediones (TZDs), fish oil, polyunsaturated fatty acids (PUFA), and ursodeoxycholic acid (UDCA)), as well as individuals who are currently using insulin.
• History of gastrointestinal diseases (Crohn's disease, ulcers, acute or chronic pancreatitis, etc.) or gastrointestinal surgery (excluding simple appendectomy or hernia surgery) that may affect the absorption of clinical trial drugs.
• History of acute proliferative retinopathy or maculopathy, severe gastroparesis, and/or severe neuropathy.
• History of surgical treatment for obesity within 2 years (example: bariatric surgery, gastric banding etc) or gastrointestinal procedures for weight loss (including LAP-BAND®), or uncontrolled gastrointestinal disorders at Screening (e.g., peptic ulcer, gastroesophageal reflux disease).