Do detox cleanses work?
Written by AI from saved sources. A script checks every quote word for word, and a second AI compares each claim with its source. How we work and corrections
Commercial detox cleanses lack convincing evidence that they remove toxins (harmful substances) or produce lasting weight loss. Low-calorie juicing and detox diets can cause initial weight loss. The liver processes toxins, and healthy kidneys remove waste.
Checked against: NCCIH (US National Institutes of Health) and a 2015 critical review; checked 24 October 2026.
Why people believe it
A 2026 mini-review (a short review) suggests social influences may draw people towards certain weight-control products. Weight-related stigma may also draw people towards these products, its authors suggest. The review describes these products as accessible and perceived as lower risk. A psychologist quoted in The Guardian in 2014 suggests that too much information can make people follow others' judgment. These are proposed explanations, not proven accounts of everyone's reasons.
“It flushes out toxins”
The liver changes toxins into less toxic forms or forms that dissolve. Healthy kidneys remove waste and extra water in urine. That does not establish that a commercial cleanse adds anything. The abstract (summary) of a 2015 critical review reported some favourable findings on toxin removal. However, it flagged flawed methods and small samples. It described very little clinical evidence supporting detox diets.
“It helps me lose weight”
A 2019 analysis covered 84 overweight Korean women who had not reached menopause. The analysis reported average weight across all participants falling from 68.3 to 66.4 kg over 11 days. The women followed very-low-calorie or normal diets. That was not a lemon-detox-only result. Within the very-low-calorie groups, lemon-detox and comparison juices supplied closely matched calories. The combined result cannot tell us how much weight loss came from the lemon product. NCCIH cites a 2017 review on juicing and detox diets. It reports that these diets can cause initial weight loss because of low calorie intake. However, they tend to lead to weight gain once normal eating resumes.
“Detox tea has research behind it”
A 2026 mini-review of diet and detox teas marketed for weight loss included ten studies of different kinds. Only one human study without a comparison group and one animal experiment tested whether the teas might work. Its targeted search covered peer-reviewed English-language studies. These were published from January 2002 through December 2024. Including ten studies therefore does not mean including ten human trials with comparison groups.
“I feel better afterwards”
The British Dietetic Association suggests changes accompanying a cleanse are more likely to explain feeling better than detox products. These changes include drinking less alcohol and getting enough sleep. Feeling better deserves to be taken seriously. The question is what caused it.
Thinking tool: name the toxin
Retailer Zumub claims NOW Liver Refresh flushes out toxins. Ask: which substance, and what happened to its measured level before and after treatment? This follows a test proposed in The Guardian's 2014 reporting: name the toxin. Naming it makes before-and-after measurement possible. A change on the scales answers a different question.
Use it on other claims: ask what, exactly, would be measured to show the promised effect.
Official positions and warnings, with dates
NCCIH, March 2025: its fact sheet describes low-quality studies in people. It says long-term effects had not been studied. It encourages discussing cleanses with health care providers. People with diabetes should consult their providers before major changes to their diet.
US FDA, January 2019: laboratory testing found sibutramine and phenolphthalein in GoLean Detox. The agency advised against buying or using it. FDA warned that sibutramine can substantially increase blood pressure or heart rate in some people. It also warned that GoLean Detox may interact with other medications in life-threatening ways. This finding concerns that named product.
What people also ask
What happens in your body when you detox?
It depends on the method. NCCIH groups juice-only diets, supplements and colon cleansing (cleaning out the large bowel) under this label. Detox programs may include laxatives, which can cause diarrhoea. Acute diarrhoea can leave the body short of water and less able to take in nutrients.
Is there a detox that actually works?
NCCIH distinguishes commercial cleanses from chelation, a chemical treatment. Chelation is used to remove toxic metals in specific serious cases.
How do you know when detox is working?
For a toxin-removal claim, ask for the substance's name and a before-and-after measurement. Feeling better alone does not supply that measurement.
What are the common side effects of detoxing?
NCCIH warns that laxatives can cause diarrhoea. It also warns about drinking large quantities of water and herbal tea without food for days in a row. This could cause dangerous electrolyte imbalances. These are warnings about possible effects, not figures showing how common they are.
Check it yourself (5 minutes)
- Open NCCIH's public fact sheet, “Detoxes” and “Cleanses”: What You Need To Know (March 2025).
- Use Find for “severely restrict”.
- Read the whole sentence: does it say a stricter diet guarantees lasting weight loss?
What you should have found
“Diets that severely restrict calories or the types of food you eat usually don’t lead to lasting weight loss and may not provide all the nutrients you need.”
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