Liver Support
About this protocol
Where to start
Get liver labs first: AST, ALT, GGT, ALP, total/direct bilirubin. If ALT or AST is elevated (typically > 30-35 U/L in men, > 25-30 U/L in women), follow up with imaging and additional workup. Hepatitis serologies, ferritin (for hemochromatosis), and ceruloplasmin (for Wilson''s disease) may be warranted.
Start with milk thistle (silymarin) at 200-400 mg standardized to 70-80% silymarin, daily. The most-evidenced hepatoprotective supplement — reduces ALT/AST in NAFLD trials.
Add NAC at 600 mg twice daily for glutathione synthesis support. Particularly relevant for adults with high oxidative liver stress (alcohol use, frequent acetaminophen, occupational chemical exposure).
Add choline at 300-550 mg daily. Most adults under-consume choline relative to needs. Choline deficiency directly causes fatty liver (rapidly reversible with supplementation in the Zeisel research).
Add methylated B-complex. B vitamins are heavily used by liver methylation cycles. Methylated forms (methylfolate, methylcobalamin) bypass MTHFR variants.
Dandelion is the most speculative — traditional use as a bitter to support bile flow. Modern human evidence is thin. Skip if you want simplicity.
The biggest liver intervention is lifestyle: reduce alcohol, reduce ultra-processed foods (especially fructose), lose visceral fat. The supplement stack is supportive.
5 nutrients
Start here
Strongest evidence — the foundation of the stack.
Milk Thistle (Silymarin)
200-400 mg standardized to 70-80% silymarin, dailySilymarin (the active complex from milk thistle) has the strongest hepatoprotective evidence in the supplement category. Trial evidence supports reduced ALT/AST in NAFLD and modest hepatoprotection in chronic viral hepatitis. Mechanism includes antioxidant activity, anti-fibrotic effects, and stabilization of hepatocellular membranes.[1, 2, 3]
NAC (N-Acetylcysteine)
600 mg twice daily (1200 mg total)NAC is a glutathione precursor. The liver uses massive amounts of glutathione for detoxification. NAC is the gold-standard treatment for acetaminophen overdose, and chronic supplementation supports baseline glutathione status. Particularly relevant for adults with high oxidative liver stress.[4, 5, 6]
Add if needed
Add these only if the foundation isn't enough.
Choline
Total 425-550 mg/day (including dietary; supplement 250-400 mg if dietary is low)Choline is required for VLDL packaging in the liver — the mechanism by which fat is exported from hepatocytes. Choline deficiency directly causes fatty liver (rapidly reversible in Zeisel''s research). Most adults under-consume choline relative to needs. Egg yolks are the richest dietary source.[7, 8, 9]
Methylated B-Complex
1 capsule daily, with breakfastLiver methylation cycles use B vitamins (especially B6, folate, B12) heavily. Methylated forms bypass MTHFR enzyme variants. Adequate B status supports homocysteine metabolism and reduces inflammatory liver burden.[10, 11]
Experimental
Emerging evidence — try last, only if curious.
Dandelion Root Extract
500 mg standardized extract dailyDandelion root has traditional use as a bitter herb to support bile flow and liver function. Modern human evidence is thin — animal studies show modest hepatoprotection but human trials are limited. Treat as the most speculative item — keep for tradition, skip for simplicity.[12, 13]
Warnings
Lifestyle improvements
Reduce alcohol — by far the biggest lever
Alcohol is the single most common modifiable cause of liver dysfunction. Moderate intake (1-2 drinks/day for men, 0-1 for women) is the upper limit for "low risk." Heavy use is hepatotoxic; chronic heavy use causes cirrhosis. A 4-week alcohol-free trial measurably reduces ALT/AST in most adults.
Address fatty liver
NAFLD/MAFLD now affects 25% of adults globally. The strongest interventions: weight loss (especially visceral fat), reduced fructose (especially from soft drinks and processed foods), increased physical activity, Mediterranean dietary pattern. 7-10% body-weight loss reverses NAFLD in trials.
Reduce fructose
Fructose is metabolized exclusively in the liver (unlike glucose, which is utilized throughout the body). Excess fructose — primarily from soft drinks, processed foods, and excess fruit juice — directly drives hepatic fat accumulation. Whole fruit is fine; concentrated fructose isn''t.
Coffee is hepatoprotective
The most-evidenced dietary lever for liver health is coffee (2-3 cups daily). Multiple cohort studies show reduced NAFLD, cirrhosis, and liver cancer risk with regular coffee consumption.
Limit acetaminophen
Acetaminophen is hepatotoxic at supratherapeutic doses (over 4 g/day in healthy adults; lower for adults who drink alcohol or have liver disease). Chronic regular acetaminophen use beyond labeled dosing is a major preventable cause of liver injury.
Exercise
Both aerobic and resistance training reduce hepatic fat content independent of weight loss. Even 150 min/week of moderate activity produces measurable NAFLD improvement.
Vaccinate
Hepatitis A and B vaccines are routine adult vaccines that prevent the second-largest preventable cause of liver disease. Get tested for hepatitis C if you''ve never been screened (one-time CDC recommendation for adults).
Annual liver labs
AST, ALT, GGT, alkaline phosphatase, bilirubin yearly. Catches the silent issues — fatty liver is asymptomatic for years before manifesting.
See a hepatologist if persistently elevated enzymes
If your ALT/AST is persistently elevated despite lifestyle changes, see a hepatologist. Workup may include ultrasound, FibroScan (non-invasive fibrosis assessment), hepatitis serologies, and autoimmune markers.
References
- Milk thistle — supplement research overviewExamine.com link
- Saller R, et al. An updated systematic review with meta-analysis for the clinical evidence of silymarin. Forsch Komplementmed. 2008;15(1):9-20.PubMed link
- Zhong S, et al. The therapeutic effect of silymarin in the treatment of nonalcoholic fatty disease: A meta-analysis. Medicine. 2017;96(49):e9061.PubMed link
- N-Acetylcysteine — supplement research overviewExamine.com link
- Dludla PV, et al. The Beneficial Effects of N-Acetyl Cysteine (NAC) Against Obesity Associated Complications: A Systematic Review. Pharmacol Res. 2019;146:104332.PubMed link
- Khoshbaten M, et al. N-acetylcysteine improves liver function in patients with non-alcoholic Fatty liver disease. Hepat Mon. 2010;10(1):12-16.PubMed link
- Choline — supplement research overviewExamine.com link
- Zeisel SH. Choline: critical role during fetal development and dietary requirements in adults. Annu Rev Nutr. 2006;26:229-250.PubMed link
- Wallace TC, et al. Choline: The Underconsumed and Underappreciated Essential Nutrient. Nutr Today. 2018;53(6):240-253.PubMed link
- B-vitamins — supplement research overviewExamine.com link
- Kennedy DO. B Vitamins and the Brain. Nutrients. 2016;8(2):68.PubMed link
- Dandelion — supplement research overviewExamine.com link
- Clare BA, et al. The diuretic effect in human subjects of an extract of Taraxacum officinale folium over a single day. J Altern Complement Med. 2009;15(8):929-934.PubMed link
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Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.