1. Able to provide written informed consent (either from subject or subject's legally acceptable representative). 2. Onset of jaundice within prior 8 weeks. 3. Average daily consumption of >40 (females) or >60 (males) grams of alcohol for 6 months or longer, with < 8 weeks of abstinence before the onset of jaundice. 4. The determination of AH may be based on typical serum chemistry (as determined by local laboratory) or liver biopsy at any time during the current episode of AH:
• Serum total bilirubin > 3.0 mg/dL
• 50 < AST < 400 IU/L
• ALT < 400 IU/L
• AST/ALT > 1.5 5. Maddrey discriminant function (MDF) ≥ 32 assuming a control prothrombin time of 12 seconds. 6. Model for End-stage Liver Disease (MELD) score: 21-30. 7. Liver biopsy is not required, but may be used to confirm the diagnosis of AH at the Investigator's discretion. Biopsy, if used as a diagnostic criterion, must have occurred during the current episode. 8. Male or female subjects 18 years of age or older. 9. Subjects must agree to use effective methods to prevent pregnancy while participating in the study. 10. Subjects must agree to participate in an alcohol abstinence support program recommended by the local institution's addiction specialists. 1. Subjects taking systemic corticosteroids for a duration exceeding 8 days in the 30 days prior to screening. 2. Subjects experiencing or considered at high risk for alcohol withdrawal seizures or delirium tremens. 3. Active infection (such as spontaneous bacterial peritonitis [SBP], urinary tract infection [UTI], bacteremia, acute viral hepatitis, uncontrolled HIV, and active SARS CoV2 infection). 4. Serum creatinine >2.5 mg/dL. 5. Subjects undergoing continuous veno-venous hemodialysis (CVVH). 6. Uncontrolled gastrointestinal bleeding. 7. A history of pre-admission refractory ascites defined as more than 4 paracenteses in the previous 8 weeks despite diuretic therapy. 8. Liver biopsy (if carried out) with findings not compatible with AH. 9. Stage ≥3 hepatic encephalopathy by West Haven criteria. 10. Any severe concomitant cardiovascular, renal, endocrine, pulmonary, psychiatric disorder, or multi-organ failure. 11. Other concomitant cause(s) of liver disease. 12. Any active malignancy or any malignancy diagnosed within the last five years other than curable skin cancer (basal cell or squamous cell carcinomas). 13. Positive Urine Drug Screen (amphetamines, barbiturates, benzodiazepines, cocaine and opiates) except THC and prescription medications. 14. Existing or intended pregnancy or breast feeding. 15. Participation in another interventional clinical trial within 30 days of Screening. 16. History of organ transplantation, other than a corneal transplant. 17. Underlying diseases that, in the opinion of the site investigator, might be complicated or exacerbated by proposed treatments or might confound assessment of study drug.

CASES: Heavy drinkers with alcoholic hepatitis Inclusion criteria 1. A clinical diagnosis of alcoholic hepatitis 2. Serum total bilirubin >3 mg/dL 3. Subject or guardian ability to understand and willingness to provide written consent 4. Age greater or equal to 21 years 5. Re-enrolment of an alcoholic hepatitis donor is permissible up to 4 times if the donor presents with a new episode of alcoholic hepatitis 24 weeks or longer after the most recent enrolment in the study Exclusion criteria 1. Liver disease significantly caused by hemochromatosis, autoimmune liver disease, Wilson disease, NAFLD, and acute viral hepatitis 2. (NOTE: The presence of chronic hepatitis C, hepatitis B, or HIV is not exclusion to participation.)Pregnant or breast feeding Based on the judgment of the investigator, subject is not capable of understanding or complying with the study requirements. CONTROLS: Heavy drinkers without significant liver disease Inclusion criteria 1. History of chronic alcohol consumption sufficient to cause liver damage. Generally, this is considered to be >40 g/day or >280g/week on average for women and >60 g/day or >420 g/week on average for men, for many years (usually decades). Judgement about chronic alcohol consumption will be made by the site investigator. 2. Subject or guardian ability to understand and willingness to provide written consent 3. Age greater or equal to 21 years Exclusion criteria 1. Past evidence of alcoholic liver disease, defined as a bilirubin > 2.0 mg/dL, an AST > 1.5 ULN, and any hospital admission for liver disease, or the presence of esophageal varices or ascites (at any time in the past). 2. Liver disease significantly caused by hemochromatosis, autoimmune liver disease, Wilson disease, NAFLD, and acute viral hepatitis (NOTE: The presence of chronic hepatitis C, hepatitis B, or HIV is not exclusion to participation.) 3. Alcohol intake at less than 40 g/day or 280g/week on average for women and 60 g/day or 420 g/week on average for men for longer than the past 28 days 4. If liver stiffness has been assessed within the prior 90 days, then stiffness suggesting fibrosis of F1 or greater is excluded. For Fibroscan, this is a fibrosis score >7.0 kPa. 5. Pregnant or breast feeding 6. Any of the following laboratory abnormalities within 90 days prior to signing the consent. 1. Total bilirubin: >ULN* 2. INR: > 1.4 5 *Individuals with a diagnosis of Gilbert's can have total bilirubin up to 3.0 mg/dL and still be eligible for participation. Healthy Controls Inclusion criteria 1. AUDIT-C scores of <4 for men and <3 for women (signifying no alcohol misuse) 2. Abstinent (consumption of less than one standard drink/week) during the 6 months prior to enrolment 3. Ability to understand and willingness to provide written consent. Exclusion criteria 1. Clinical history or laboratory evidence of liver disease including alcoholic liver disease, NAFLD, hemochromatosis, alcoholic hepatitis, autoimmune liver disease, Wilson disease, hepatitis C, or hepatitis B. 2. Presence of diabetes (requiring treatment with oral agents or insulin). 3. Significant heart disease (prior history of heart disease, other than hypertension) 4. Chronic lung disease (requiring chronic treatment) 5. Immune related conditions (such as Crohn's disease, rheumatoid arthritis, ulcerative colitis, systemic lupus erythematosus, severe psoriasis, etc.) 6. Known infection with HIV 7. Presumed infection, or use of antibiotics or other medications (e.g., corticosteroids) that would affect immune function, within the past 14 days 8. BMI>35 9. Current or known history of cancer (except in situ carcinoma of the cervix or adequately treated basal or squamous cell carcinoma of the skin) within 5 years prior to enrollment 10. Pregnant or breast feeding 11. Any of the following laboratory abnormalities within 90 days prior to signing the consent. 1. Hemoglobin: <10 g/dL 2. Conjugated bilirubin: > ULN 3. INR: > 1.4 4. AST: >40 IU/mL 5. ALT: >40 IU/mL 12. Based on the judgment of the investigator, subject is not capable of complying with the study requirements