Detox Juice: What Science Really Says (2025 Guide)
This article respects our editorial charter and EFSA recommendations on health claims.
Every January, searches for “detox juice” explode. Normal: after the holidays, we want lightness. But between marketing promises and scientific reality, the gap is sometimes immense.
At Joy Juice, we prefer transparency. From our workshop in Grasse, we press fresh juices every day. And we learned one thing: exaggerated promises serve no one.
In this article, we tell you what science really knows – with supporting studies – and what it doesn’t yet know. With a bonus: three simple recipes to reproduce at home and our advice for choosing quality juice.
Ready to sort out fact from fiction? It's gone.
What is “detox”? what science really says
The word “detox” is everywhere. But what does it really mean from a physiological point of view?
Spoiler: your body doesn't wait for a juice cleanse to cleanse itself. He does it all the time.
Your liver, the recycling factory
The liver is the central organ of this process. According to a review published in the Journal of Nutrition and Metabolism (Saha et al., 2014), it operates in three phases:
- Phase I : enzymes (cytochrome P450) transform the compounds to be eliminated into more reactive molecules
- Phase II : these molecules are made water-soluble thanks to glutathione and other enzymes (GST, UGT)
- Phase III : elimination via bile, urine or sweat
This system runs 24 hours a day. The kidneys, skin and lungs also participate.
The myth of accumulation
Contrary to what marketing suggests, toxins do not “build up” in a healthy body. As Johns Hopkins Medicine reminds us: “The liver does not need to be cleansed by special cures.”
The exception? Chronic exposure to certain heavy metals (lead, mercury). But that's medicine, not juice.
What juices can actually do : provide nutrients — vitamins, minerals, polyphenols — which serve as cofactors for liver enzymes. We support the system, we do not “purify” it.
Nutrients that actually support your body
Let's get to the facts. What nutrients in juice have documented effects?
Vitamin C: cellular protection
Lemon contains 53 mg of vitamin C per 100 g. EFSA authorizes the claim: vitamin C “helps protect cells against oxidative stress”.
A meta-analysis of 28 clinical trials (Messina et al., 2024) confirms: regular consumption of fruit juice increases plasma levels of vitamin C and reduces malondialdehyde (MDA), a marker of oxidative stress.
Ginger: digestive support
EFSA recognizes that ginger “may help support digestion” (ID 2170). The gingerols it contains have shown effects on gastric motility.
Bonus: with 415 mg of potassium per 100 g, it is also a source of electrolytes.
Turmeric: liver function
It is perhaps the best-researched ingredient for the liver. EFSA authorizes the claim: turmeric “supports liver function” (ID 4009).
A systematic review of 29 clinical trials (Zhang et al., 2024) shows that polyphenols — including curcumin — improve liver markers (ALT, AST, GGT) in people with steatosis.
Beetroot: antioxidants and more
The betalains (purple pigments) of beets have antioxidant properties. In addition, beets contain 80 µg of folate per 100 g (40% of daily requirements). Folates “help reduce fatigue” selon l’EFSA. spirulina and its phycocyanin offer additional protection documented by several meta-analyses.
A clinical trial (Saleh et al., 2024) even showed that daily consumption of oranges for 4 weeks reduced the prevalence of fatty liver disease by 30% — independent of weight loss.
| Nutriment | Source | Proven benefit | EFSA claim |
|---|---|---|---|
| Vitamine C | Lemon, orange | Antioxydant | “helps protect cells against oxidative stress” |
| Gingerols | Ginger | Digestion | “may help support digestion” |
| Curcumine | Curcuma | Liver function | “supports liver function” |
| Folates | Beet | Energy | “help reduce fatigue” |
Juice alone or juice + food? the response of the studies
Here is a crucial question. And the answer may surprise you.
The Northwestern study (2025)
Researchers at Northwestern University conducted a pilot test on 14 participants over 3 days (Ring et al., 2025). Three groups: juice alone, juice + food, food alone.
Result ? The “juice only” group showed a disruption of the intestinal microbiota :
- Increase in pro-inflammatory bacteria
- Reduction of Firmicutes (beneficial bacteria)
- Increased intestinal permeability
Good news: these changes are reversible. The microbiota regains its balance in 14 days.
Why this result?
Juices, even cold-pressed, contain very little insoluble fiber. However, these fibers are the main fuel of our microbiota.
Our recommendation
A glass of fresh juice in the morning + a varied diet is better than a “cure” of juices alone for 7 days. Juices are a supplement, not a replacement.
If you want to maintain fiber, opt for a smoothie (where the whole fruit is blended) or accompany your juice with a balanced breakfast.
Ce qu’on fait chez Joy Juice
We will never offer you a “7-day cure of juices alone”. This is not our philosophy. Our juices are designed as supplements to your daily diet — a morning shot of nutrients, not a restrictive diet.
Moreover, our regular customers often tell us: it is the daily ritual that makes the difference, not occasional excesses followed by deprivation.
3 wellness juice recipes to make at home
No need for sophisticated equipment. A juice extractor (or even a blender + strainer) is enough. Here are three recipes tested and approved by our team.
wash your fruits and vegetables well, and consume your juice within 15 minutes to make the most of the nutrients — especially vitamin C, which is sensitive to oxidation.
The green alarm clock
Hydration & Lightness
Ingredients :
- 2 stalks of celery (≈ 200 g)
- 1/2 cucumber
- 1/2 lemon (with a little zest)
- 1 cm of fresh ginger
Why does it work?
Celery is made up of 95% water: guaranteed hydration. Ginger “may help support digestion” EFSA. Lemon provides vitamin C.
When to drink it? In the morning on an empty stomach, to start the day off right.
🛒 Discover our version →Soft energy
Vitality without glycemic peak
Ingredients :
- 2 carottes moyennes
- 1 orange
- 1 cm of ginger
- 1/2 teaspoon of turmeric powder
Why does it work?
Vitamin C in orange “contributes to the normal functioning of the immune system” EFSA. Turmeric “supports liver function” EFSA. The carrot provides carotenoids.
a pinch of black pepper increases the absorption of curcumin.
Intense red
Antioxydants
Ingredients :
- 1 medium beet (raw, peeled)
- 1 apple
- 1/2 lemon
Why does it work?
Beet betalains have recognized antioxidant properties. Natural nitrates promote the production of nitric oxide (beneficial for circulation). Folate “helps reduce fatigue” EFSA.
When to drink it? In the morning or before a sports session.
🛒 Discover our version →How to choose a quality juice?
Not all juices are equal. Here are the criteria that really matter.
Cold pressed vs. centrifuged
Cold extraction generates less heat. Result: sensitive nutrients (vitamin C, polyphenols) are better preserved. If the label doesn't say anything, it's probably centrifuged juice.
Shelf life: 7 days vs 30+ days
A juice that can be kept for several months has been pasteurized. Pasteurization destroys some of the enzymes and polyphenols.
At Grasse, our juices are cold pressed and can be stored 7 days in the refrigerator. It's short, but that's the price of freshness.
Local and artisanal
Knowing the origin of your ingredients is important. Our beets come from Villeneuve-Loubet, our celery from Vence, our lemons from Menton. When you know the producer, you know what you are drinking.
Balanced compositions
100% fruit juice = lots of natural sugars. Favor mixtures with a vegetable base (celery, cucumber) to limit sugar intake while retaining nutrients.
What to look for on the label
A few things to look out for before buying:
- Ingredient List : short and understandable (no additives)
- Added sugars : absolutely avoid
- Date of manufacture : the more recent, the better
- Method of conservation : fresh juice should be kept cool, not at room temperature
FAQ: your questions about well-being juices
How many days can you do a juice cleanse?
Studies suggest that 1 to 3 days maximum of juice alone is reasonable. Beyond this, the intestinal microbiota can be disrupted (Ring et al., 2025). The optimal approach: integrate a daily fresh juice into a varied diet, rather than a restrictive treatment.
Do detox juices really help you lose weight?
Temporarily, yes (water loss). Long-term, no. Juices provide less fiber and protein than whole foods. For lasting weight loss, choose a balanced diet. Juices can be a supplement, not a sole solution.
Can you drink fresh juice every day?
Yes, in addition to a varied diet. A 250 ml glass per day provides vitamins and antioxidants without excess sugars. Favor juices with a vegetable base (celery, cucumber) to limit the natural sugars in fruits.
What juice can support liver function?
Turmeric “supports liver function” EFSA. Citrus fruits provide vitamin C which “helps protect cells against oxidative stress” EFSA. Our Cold Buster combines orange, carrot, ginger and turmeric — a synergy designed for overall well-being.
Is it better to drink your juice in the morning or in the evening?
Morning fasting promotes nutrient absorption. Ginger “may help support digestion” EFSA and prepares the stomach. Avoid sugary juices in the evening so as not to disrupt sleep. Celery-based juices are suitable for any time.
Are there any risks to a prolonged juice cleanse?
Yes. Beyond 3 days, risk of: disruption of the microbiota (Northwestern 2025), protein and fiber deficiencies, hypoglycemia. People at risk: diabetics, kidney failure (high potassium), history of kidney stones (oxalates). Consult a healthcare professional before any treatment.
The balanced approach: our conviction
Let's summarize what science tells us.
What is proven:
- Fresh juices provide real nutrients (vitamin C, polyphenols, gingerols)
- These nutrients support the body's natural functions
- Certain claims are validated by the EFSA (immunity, oxidative stress, digestion, liver function)
What is not proven:
- Juices “purify” or “cleanse” the body
- An intensive treatment is better than moderate daily consumption
- Juices can replace a balanced diet
Our recommendation:
A fresh juice a day, in addition to a varied diet. It’s simple, it’s honest, and that’s what the studies support.
Sources and references
Last updated: December 2025
Article written by the Joy Juice team, based on verified scientific sources (PubMed, ANSES, EFSA).
The information in this article is provided for educational purposes. They do not replace medical advice. Consult a healthcare professional with any questions regarding your diet or health.