Short answer: the liver processes nutrients and medicines, makes bile and important proteins, stores energy and helps remove waste. The most useful ways to look after it are to stay within low-risk alcohol guidance, maintain a healthy weight, eat a balanced diet, be active and address hepatitis risk—not to use a “detox” product.
What does the liver do?
The liver is involved in hundreds of functions. Its main jobs include:
- processing nutrients absorbed from food;
- metabolising alcohol and many medicines;
- making bile, which is involved in fat digestion;
- making proteins used in blood clotting and other body processes;
- storing glycogen, vitamins and minerals; and
- processing waste so it can be removed from the body.
“Detox” is therefore a normal set of biological processes, not a short programme that can be switched on by a tea, juice or capsule.
What are the main preventable liver risks?
The NHS identifies obesity, undiagnosed hepatitis infection and alcohol misuse as three major causes of liver disease. Different liver conditions have different causes, and many do not produce symptoms in their early stages.
Alcohol
If you drink most weeks, UK low-risk guidance advises no more than 14 units a week, spread across three or more days. Several drink-free days can help if you are cutting down. “Low risk” does not mean risk-free.
If you drink heavily or may be dependent on alcohol, it can be dangerous to stop suddenly. Ask a GP or alcohol support service for help to reduce safely.
Weight, diet and activity
Metabolic dysfunction-associated steatotic liver disease—also known as non-alcoholic fatty liver disease—often has no symptoms and is commonly found during tests for another reason. The NHS recommends a balanced diet, regular exercise and weight loss where appropriate; it suggests aiming for at least 150 minutes of activity a week.
Hepatitis
Some hepatitis infections can persist without obvious symptoms. Vaccination is available for hepatitis A and B for people at increased risk. A GP or travel clinic can advise based on travel, work, health and other risk factors.
Which symptoms need medical advice?
See a GP if you think you may have liver disease, have risk factors or have abnormal liver blood tests. Use urgent GP help or NHS 111 if your skin or the whites of your eyes turn yellow.
Other possible liver-disease symptoms include persistent tiredness or weakness, loss of appetite, unexplained weight loss, itching, nausea, pain under the right ribs, darker urine, paler stools, abdominal swelling or swollen legs. These symptoms have many possible causes; they need assessment, not a supplement trial.
Call 999 or go to A&E for vomiting blood or black, sticky stools, severe abdominal symptoms with concern about alcohol-related liver disease, difficulty breathing, sudden confusion, dizziness or difficulty staying awake.
Where can choline claims fit?
Choline can carry authorised GB claims when the product supplies the required amount: it contributes to the maintenance of normal liver function, normal lipid metabolism and normal homocysteine metabolism.
These are maintenance claims for a nutrient. They do not mean that a choline supplement cleanses the liver, reverses fatty liver disease or repairs damage from alcohol.
What about milk thistle, artichoke and NAC?
These are common ingredients in the category, but a food-supplement page should not turn interest or traditional use into a treatment promise. NAC’s use as a medicine in paracetamol overdose is a specific clinical use under medical supervision; it does not prove that an ordinary NAC-containing supplement “detoxes” a healthy liver.
Compare these ingredients by form, amount and standardisation. Our liver-supplement ingredient guide explains how.
The practical hierarchy
- Act on symptoms and risk factors with a GP rather than self-diagnosing.
- Keep alcohol within guidance, or seek support if cutting down is difficult.
- Use diet, activity and weight-management support appropriate to you.
- Review medicines and supplements with a pharmacist; do not stop prescriptions independently.
- If you still choose a food supplement, use authorised claims and the full label—not “detox” language—to compare it.
Related guides
- Liver-support supplement ingredients explained
- UK liver supplements compared
- After festive overindulgence: a sensible reset
Sources
- NHS: liver disease
- NHS: non-alcoholic fatty liver disease / MASLD
- NHS: alcohol-related liver disease
- NHS: jaundice
- Great Britain Nutrition and Health Claims Register
Written by: Barry Lees, founder of The Health Improvers
Last reviewed: 2 August 2026
This guide is general information, not diagnosis or medical advice. Food supplements are not substitutes for a varied, balanced diet and a healthy lifestyle.
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