Do Detox and Cleanse Diets Work? The Evidence

The Short Answer: Your Body Already Does This

The liver, kidneys, gut, and lungs filter and remove metabolic waste and foreign compounds continuously as part of normal physiology. Commercial detox and cleanse products are marketed on the idea that the body needs help doing this. A 2015 review found no randomized controlled trial evidence that any commercial detox diet speeds up or improves how the body clears toxins (Klein and Kiat, 2015) [1]. Some of these products carry their own documented risks, covered below.

What "Detox" and "Cleanse" Usually Mean as Products

On this page, "detox" and "cleanse" refer to commercial products and marketed eating programs: juice cleanses, herbal "detox" teas, branded supplement kits, and similar short-term diets sold on a toxin-removal or weight-loss promise. That is a marketing category, not a validated medical procedure, and this page evaluates it as one. This is distinct from fasting itself; for what fasting means and the different methods this site covers, see what is fasting.

What the Research Actually Shows

No Trial Has Shown a Commercial Detox Diet Removes Toxins

A 2015 critical review states plainly that although the detox industry is "booming," there is very little clinical evidence supporting commercial detox diets, and that, to the authors' knowledge at the time, no randomized controlled trials had tested the effectiveness of commercial detox diets in humans (Klein and Kiat, 2015) [1]. The review notes a small number of clinical studies suggesting certain detox diets may enhance liver detoxification or help eliminate some persistent organic pollutants, but describes these as hampered by flawed methodology and small samples, and separately notes that evidence for specific detox-associated foods, such as coriander, nori, and olestra, is "preliminary" and mostly from animal studies (Klein and Kiat, 2015) [1].

One randomized trial published after that review tested a 7-day commercial lemon detox program (maple and palm syrup with lemon juice) in 84 overweight premenopausal women, against a calorie-matched placebo juice diet and a no-diet control. Both the detox and the placebo diets reduced body weight, body fat, and insulin resistance more than no diet; a marker of inflammation (hs-CRP) fell only in the detox group; the authors attribute the weight and insulin changes to calorie restriction, and the trial measured no toxin outcome (Kim et al., 2015) [2]. It measured no toxin outcome, so it does not test a toxin-elimination claim; a calorie-matched comparison diet produced most of the same changes.

Detox Teas: Little Benefit, Documented Risks, and Undeclared Ingredients

A 2026 mini-review of diet and detox teas marketed for weight loss, covering experimental research, case reports, product analyses, and marketing assessments, found the evidence overall provides "limited support" for a weight-loss benefit, with a small number of experimental studies suggesting modest effects, while most of the evidence base was case reports and product analyses rather than controlled trials (Noor et al., 2026) [3]. The same review reports multiple serious adverse outcomes associated with diet and detox tea use in otherwise healthy people, including electrolyte disturbances, cardiovascular events, and liver injury, plus product analyses finding undeclared pharmaceutical ingredients and labeling that did not match actual contents in products marketed as "natural" (Noor et al., 2026) [3].

A Real-World "Cleanse" Program: Self-Reported Comfort, Not Measured Health Change

A study following a community "cleanse" detox program in Appalachia surveyed 34 participants before a 21-day program, 15 one week after, and only 8 at an 8-week follow-up (Davisson and Sofka, 2019) [4]. Self-reported cravings, energy, and sleep quality improved significantly between the pre-program and 1-week-post surveys; self-reported weight satisfaction and overall health showed no significant difference (Davisson and Sofka, 2019) [4]. This measured self-report only, not any objective biomarker or toxin-elimination outcome, had steep survey attrition (24% of initial participants completing the 8-week survey), and the study's own authors call for a future study with measured rather than self-reported outcomes (Davisson and Sofka, 2019) [4]. Read the improvements here as subjective wellbeing reports in a small, non-randomized sample, not evidence that the program removed toxins or produced a measured health benefit.

Where Fasting Fits

Fasting itself, including the water-only fasting covered elsewhere on this site, is a distinct practice from a commercial detox or cleanse product: it is the planned absence of food (and, in a water-only fast, of anything but water), not a branded supplement, tea, or juice regimen. This page does not claim that fasting is a "detox" in the toxin-elimination sense; no citation reviewed here tests what a water-only fast specifically does to the body's own detoxification enzyme pathways. What a water-only fast does and does not do is covered on its own page, not repeated here. A related evidence question, whether and when fasting raises cellular autophagy in humans, is a separate claim with its own separate evidence, covered on its own page rather than here.

Documented Risks of Detox and Cleanse Products

Juice Cleanses and Kidney Injury

A 65-year-old woman with a history of gastric bypass surgery and recent prolonged antibiotic therapy developed acute oxalate nephropathy, progressing to end-stage renal disease, in temporal association with an oxalate-rich "green smoothie cleanse" made from juicing oxalate-rich leafy greens and fruit (Makkapati et al., 2018) [5]. The case report's authors describe this risk in people with predisposing factors such as chronic kidney disease, gastric bypass, or recent antibiotic use (Makkapati et al., 2018) [5].

Herbal "Kidney Detox" Regimens and Severe Low Sodium

A 67-year-old man developed severe hyponatremia (serum sodium of 111 mmol/L, with neurological symptoms) after a 5-day "kidney detox" regimen that combined more than a gallon of fluid per day with an herbal tea containing uva ursi leaves, juniper berries, and several other ingredients (Soliman et al., 2018) [6]. The report attributes the event to the regimen as a whole, which combined the tea with a very large daily fluid intake. Herbal detox regimens like this one are easily accessible over the counter and not well studied for adverse effects (Soliman et al., 2018) [6].

Herbal Detox Teas and Liver Injury

A 60-year-old woman developed acute fulminant liver failure, confirmed by biopsy showing submassive hepatic necrosis, after drinking a branded "detox tea" three times daily for 14 days (Kesavarapu et al., 2017) [7]. The case report's own review of the product's ingredients found six with documented hepatotoxic effects and the rest with only sparse hepatoprotective data; laboratory tests and imaging were negative for other causes of liver failure (Kesavarapu et al., 2017) [7].

Colon Cleanses

A 2009 systematic review of colon cleansing for general health promotion found no methodologically rigorous controlled trials supporting the practice, and found multiple case reports and case series describing adverse effects (Acosta and Cash, 2009) [8].

What This Page Does Not Claim

This page does not claim that detox or cleanse products remove toxins from the body, and it does not claim that fasting itself is a toxin-elimination "detox." It also does not claim that all cleanse-adjacent eating patterns are dangerous: the harms above come from individual case reports involving specific products (herbal teas and regimens, an oxalate-rich juice cleanse), and in the kidney case specific predisposing factors, not a blanket indictment of every short-term eating pattern marketed as a cleanse. What the evidence supports is narrower than either extreme: no proof of a toxin-elimination benefit, and documented harms in individual case reports, whose frequency is unknown. For more on how fasting research generally should be read, see fasting research facts. For more on what the gut does on its own, see fasting and gut health.

Safety and Cautions

This is general information, not medical advice. Case reports have linked a juice cleanse and herbal detox regimens to kidney injury, severe electrolyte imbalance, and liver damage. Anyone with chronic kidney disease, a history of gastric bypass surgery, or recent antibiotic use should be especially cautious with oxalate-rich juice cleanses (Makkapati et al., 2018) [5]. Talk to a clinician before starting any fasting, juice-only, or cleanse program if you are pregnant, under 18, have a history of an eating disorder, or manage diabetes or blood pressure with medication.