Trial of ARI-3037MO to Reduce Triglyceride Levels in Adults With Severe (≥500 mg/dl) Hypertriglyceridemia

Inclusion Criteria 1. Age ≥ 18 years. 2. Subjects willing to comply with lifestyle
intervention modifications (diet and exercise) 3. TG levels: At randomization, mean level
> 500 mg/dL and < 2,000 mg/dL. 4. Understands the trial requirements and the treatment
procedures, is willing to comply with all protocol-required follow-up evaluation and
provides written informed consent.

5. Patients already taking statin therapy must be on a stable dose, defined as no changes
in the dose of statin in the 3 months prior to enrollment, and must be willing and able to
remain on that dose for the duration of the study.

Exclusion Criteria 1. History of pancreatitis. 2. Body mass index > 45 kg/m2. 3. Weight
change ≥ 3 kg during the lead-in period. 4. Contraindication to niacin treatment (prior
flushing is not regarded as a contraindication to niacin treatment).

5. Uncontrolled diabetes, defined as HbA1C > 10.5. 6. Subjects who would benefit from
statin treatment per clinical guidelines but who are not taking statins are excluded.
However, these patients may be included only if the subject's primary care physician
confirms the decision not to treat according to guidelines and its reason (e.g. statin
intolerant subjects, subject refusal, etc.), and it has been agreed upon by the subject,
the site investigator, and the primary care physician, after discussion of the potential
risks of non-treatment with statins..

7. History of stroke, myocardial infarction, life-threatening arrhythmia, or coronary
vascularization within 6 months before screening.

8. Thyroid-stimulating hormone ≥ 1.5 times the ULN. 9. Clinical evidence of hypothyroidism
or thyroid hormonal therapy that has not been stable for ≥ 6 weeks before screening.

10. Creatine kinase concentration ≥ 3 times the ULN. 11. Known, active liver disease,
including but not limited to:

1. Confirmed alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline
phosphatase, or bilirubin ≥ 2 times the ULN.

2. Hepatitis C (anti-hepatitis C virus IgG +).

3. Hepatitis B (hepatitis B surface [HBs] antigen +, anti hepatitis B core [HBc] antigen
immunoglobulin M [IgM]+).

4. Hepatitis A (anti HBa IgM+). 12. Blood donation of ≥ 1 pint (0.5 L) within 30 days
before screening or plasma donation within 7 days before screening.

13. History of symptomatic gallstone disease unless treated with cholecystectomy.

14. Known nephrotic syndrome or ≥ 3 g/day proteinuria. 15. Past organ transplant or
on a waiting list for an organ transplant. 16. Currently receiving or scheduled to
receive chemotherapy within 30 days before or after enrollment.

17. Other serious medical illness (e.g., cancer, congestive heart failure) with
estimated life expectancy of less than 12 months.

18. Problems with substance abuse, which, in the opinion of the investigator, might
affect study compliance.

19. Planned procedure that may cause non-compliance with the protocol or confound
data interpretation.

20. Current participation in another investigational drug or device clinical trial
that has not reached its primary endpoint.

21. Women who intend to become pregnant within 12 months after enrollment. Women of
child-bearing potential who are sexually active must agree to use a reliable method
of contraception from the time of screening through 12 months after enrollment.

22. Women who are pregnant or nursing. 23. Estimated glomerular filtration rate
(eGFR) < 60 mL/min/1.73