A total of 12 subjects will be injected with RZL-012 and placebo. Each of the subject's flanks will be randomized for each of the treatment. A total of 24 flanks will be randomized in the double blind phase. They will be monitored for safety and efficacy for 12 weeks. After codes opening, a second treatment cycle on the previously untreated contralateral flank will be done. Subjects will be monitored for safety and efficacy for additional 12 weeks.

This clinical trial is comprised of a double-blind, placebo-controlled phase followed by an open-label phase.

The double-blind, placebo-controlled phase of the trial will consist of a screening period, baseline visit and a 12-week post-treatment follow-up period. At the baseline visit, each flank (right and left) of each study participant will be randomized into either the active RZL-012 treatment group or the placebo group and each flank will receive multiple injections in a single session of RZL-012 or placebo. Blood samples will be collected for 6 of the 12 subjects for PK analyses. All subjects will be followed up for 12 weeks after the single treatment session.

Upon completion of the double-blind phase of the study, and the opening of codes subjects will be offered RZL-012 open-label treatment in the flank previously treated with placebo. Consenting subjects will be followed for safety and efficacy for an additional 12 weeks.

In both the double-blind and open-label phases of the study, subjects will be monitored for adverse events (AEs). Subjects will return to the site for visits at 1 week, 4 weeks, 8 weeks, and 12 weeks post treatment and will be monitored for safety and efficacy during these visits.

Subjects who will be collected with PK will return to the clinic at Day 1 post injection for further PK samples.

The dimensions of flanks will be measured using 3D images and volumetric calculations using Canfield 3D images.

Inclusion Criteria:

• Is a male or female subject between the ages of 18 and 65 years, inclusive.

• Has body mass index (BMI) BMI of ≥ 22 and < 30.

• Has clearly visible and palpable fat in the flanks

• Has symmetrical appearance of right and left flanks

• Agrees to maintain weight (i.e., within 5% of body weight) by not making any changes in diet.

• Agree to avoid exposure of the treated area to the sun for at least 1 month after each treatment session.

• If female, is not pregnant or breastfeeding based on the following:

  1. agree to the use of highly effective contraceptive methods for at least 2 weeks before baseline until 28 days after the last day of study drug and a negative urine pregnancy test at screening and baseline; or
  2. is of nonchildbearing potential defined as clinically infertile as the result of surgical sterilization (hysterectomy, bilateral tubal ligation, and/or bilateral oophorectomy); or
  3. is confirmed postmenopausal status (defined as either having amenorrhea for ≥ 12 consecutive months without another cause, having documented serum follicle-stimulating hormone (FSH) level > 40 mIU/mL, or having another documented medical condition (e.g., was born without a uterus))

• If male (with or without vasectomy), agree to the use of highly effective contraceptive methods, e.g. condom, from study baseline until 7 days after the last day of study drug.

• Is willing to avoid strenuous exercise for seven (7) days post treatment.

• Is motivated to adhere to the visit schedule and protocol requirements.

• Is willing and able to sign an Institutional Review Board (IRB) approved informed consent form (ICF) indicating that they are aware of the investigational nature of the study.

Exclusion Criteria:

• Is unable to tolerate subcutaneous injections.
• Has dysfunctional gallbladder activity (e.g., underwent cholecystectomy or cholecystitis).
• Has an uncontrolled systemic disease that is not stabilized (i.e., cardiovascular disease, mental illness).
• Has used anticoagulation therapies that may increase bleeding or bruising (i.e., aspirin, ibuprofen, vitamins, and herbal preparations) for seven (7) days prior to treatment.
• Has medication or a history of coagulopathy.
• Has a history or family history of venous thrombotic disease.
• Had a non-invasive fat reduction and/or body contouring procedure in the flanks within the past 12 months.
• Has any scars, unshaven hair, tattoos, on or near the proposed treatment area.
• Has significant history or current evidence of a medical, psychological or other disorder that, in the Investigator's opinion, would preclude enrollment in the study.
• Has an active dermatitis or open wound in the proposed treatment area.
• Abnormal coagulation profile including: activated partial thromboplastin time (aPTT) > ULN, international normalized ratio (INR) > ULN reference range (> 1.3), prothrombin time (PT) > ULN.
• Has an active bacterial, fungal, or viral infection in the proposed treatment area.
• Has known allergic reactions to any injectables.
• Has been treated chronically in the past 3 months prior to study entry with systemic steroids or immunosuppressive drugs.
• Has been treated chronically at least one (1) week prior to study entry with non-steroidal anti-inflammatory drugs (NSAIDs).
• Current participation or participation within three (3) months prior to the start of this study in a drug or other investigational research study

12 weeks Double blind phase and 12 weeks open label phase