It’s one thing to spend a week exercising, eating properly and getting medical advice.
It’s another to pay a substantial premium for a proprietary formula that is supposed to help the body regenerate itself.
I find the concept interesting, but I’d like to know exactly what is being administered, how it works and what evidence shows that it does anything meaningful in humans.
So I went looking. The short version: Clinique La Prairie does not disclose what CLP Extract contains, the peer-reviewed research we could find is in mice and cells with clinic involvement, and no human trial of the current product appears in the literature or in trial registries we checked. On the evidence available, the extract can’t be assessed. That is a finding in itself.
A note on what I did and did not experience. I stayed at Clinique La Prairie for the seven-day Master Detox, which does not include CLP Extract; that week is in my LocalsInsider account and in our Clinique La Prairie review. Everything below about Revitalisation comes from the clinic’s program pages, published studies, regulatory sources and independent reporting.
CLP Extract in brief: the answer first
- What it is: a proprietary “revitalisation formula,” given “in conjunction with bio-stimulants.” The clinic does not publish its ingredients, and does not say what the bio-stimulants are.
- How it is taken: orally, according to the clinic’s own February 2026 explainer.
- Where it comes from: independent reports from 2005 to 2020 describe an extract of fetal sheep liver from animals bred for the clinic. The clinic’s current pages neither confirm nor deny this.
- Evidence: two peer-reviewed studies, in mice (1998) and mouse cells (2005), with clinic staff or funding involved. No published human trial of the current formula that we could find.
- Our classification: insufficient evidence for its regeneration, immunity and longevity claims.
What Clinique La Prairie says about CLP Extract
The official Revitalisation page calls CLP Extract “our founding active ingredient perpetually updated, the science of longevity best kept secret.” It describes “a powerful formula created to help regenerate the organism and fight the effects of aging,” and “the product of 90 years of research in longevity.”
The FAQ is more modest than the headline. “Most guests report improved energy, better sleep, enhanced mental clarity, and a stronger immune system.” Many “experience positive effects for 12 to 24 months,” and the clinic recommends repeating the program every 12 to 24 months. “Side effects are very rare,” though some guests “may feel a little tired after the therapy.” It describes the program as “ideal for adults over 30.”
Notice what is missing: a mechanism. The clinic says the extract helps “regenerate the organism.” It does not say which cells, tissues or pathways it acts on, or how anything swallowed would get there. We won’t fill that gap with a guess.
What the current Revitalisation program includes
Around the extract, the seven days bundle a lot of medicine, some conventional and some less so. According to the program page, checked October 2026:
- Diagnostics: advanced lab tests, a “Gene Aging” DNA test, glycan and ceramide screening, an ECG, a dental panoramic X-ray and dental check-up, plus a chest X-ray and abdominal ultrasound “only after initial evaluation with your referring doctor.”
- Consultations: longevity consultations with week-long follow-up by a lead physician, an aesthetic consultation and a skin analysis.
- Proprietary products: CLP Extract with bio-stimulants, the “CLP Cellular Genomic Revitalisation FFS1-5 Activator,” a daily HP-Cellular Active booster, an “immuno-therapeutic supplement” and three daily CLP complexes and infusions.
- Injections: one antioxidant injection, plus “vitamin/essential therapy” based on lab results.
- Nutrition: a DNA microbiota test with a probiotic course and a remote follow-up, an immuno-nutrition workshop, a nutrition consultation and anti-inflammatory menus.
- Wellbeing and movement: neuro-wave stimulation, a La Prairie facial, a revitalising massage, a 90-minute treatment chosen after an assessment, and one personal training session.
- Also included: luxury accommodation, full board, limousine transfer and use of the fitness and wellness facilities.
Revitalisation Premium keeps all of that and adds a cardiologist with stress test, a CT calcium score, a brain MRI, an epigenetic test, a dermatology consultation, three antioxidant injections instead of one, cryotherapy with photobiomodulation and a Corsano wearable monitor. Its page describes the FFS1-5 Activator as a two-month course of five supplements. Both programs are offered only in Montreux.
Revitalisation vs Master Detox: what the extra money buys
The cheaper Master Detox, which I did, is built around gut health and nutrition, with a cleansing protocol and two antioxidant injections. It has no CLP Extract. Here is the arithmetic on the official “from” prices.
| Step up | Extra cost (7 days) | What you get for it |
|---|---|---|
| Master Detox (CHF 20,950) to Revitalisation (CHF 31,800) | CHF 10,850 | CLP Extract and bio-stimulants, the FFS1-5 and HP-Cellular products, a Gene Aging test in place of Gene Nutrition, ECG and conditional chest X-ray and ultrasound, vitamin therapy, luxury rather than standard room, limousine transfer; you lose the cleanse and cryotherapy |
| Revitalisation to Revitalisation Premium (CHF 50,250) | CHF 18,450 | Cardiology and stress test, CT calcium score, brain MRI, epigenetic test, dermatology, two more antioxidant injections, cryotherapy, wearable |
The second jump is mostly diagnostics, and some of those are standard medicine for the right person. The first is harder to read. The extract, a room upgrade and a few tests are rolled into one price, and the clinic doesn’t sell the extract on its own, so there is no way to see what it costs, or what it adds.
Neither page publishes room supplements, à la carte treatment prices, deposit or cancellation terms. Ask for a written quote.
From live sheep cells to a secret extract: a short history
The story starts with Paul Niehans, the Swiss surgeon who founded the clinic in 1931. According to the clinic’s own history, his first case that year involved injecting “fresh cells from calf parathyroid glands.” His wider practice used cells from organs “taken initially from young animals, and later from sheep foetuses.” The clinic lists Winston Churchill, Konrad Adenauer and Pope Pius XII among those who sought his “youth cures,” and acknowledges “skepticism and controversy from some quarters of the medical community.”
The clinic’s timeline says CLP Extract was developed in the 1980s, under the Swiss entrepreneur Armin Mattli. Outside reporting fills in more. A 2005 CNN report described the treatment as an extract of fetal liver from specially reared black sheep, prepared in an on-site lab, and said the clinic had stopped using fresh, live cells about a decade earlier. Its then chief physician, Thierry Wälli, told CNN that one fetal liver could treat 25 to 30 people, and added, disarmingly: “You don’t stop aging.”
A 2009 account in the spa publication ELIXIR reported that liver cells had been identified as the key component in 1987, that the extract had been liver-based since 1988, and that it was then given “as a drink” rather than the original 14 injections, with patients watched for two hours for allergic reactions. The clinic’s 2026 blog confirms only the route: “The Revitalisation extract itself is taken orally.”
So the old live-cell injections and today’s CLP Extract are not the same thing, by the clinic’s own account. But how today’s product relates to those 2005 and 2009 descriptions, we can’t say, because the clinic now calls it “perpetually updated” and discloses nothing about its source or composition.
What is public, and what is missing
The first question for any treatment is simple: what is it, and has it been tested? Here is the inventory.
| Information | Publicly available? |
|---|---|
| Ingredients or active components | No |
| Animal or other source | Not confirmed by the clinic; older press says fetal sheep liver |
| Dose, frequency, length of course | No |
| What the “bio-stimulants” are | No |
| Manufacturing and quality standards | No |
| Regulatory classification | Not found |
| Proposed mechanism of action | No; only “regenerate the organism” |
| Registered human trial | None found |
| Published human efficacy data | None found |
| Published safety data | None found; FAQ says side effects are “very rare” |
| Data behind “12 to 24 months” | None published |
Compare that with the clinic’s retail supplements, which carry full ingredient lists. The secrecy is a choice.
The published studies behind CLP Extract
We found two peer-reviewed papers that study a fetal sheep liver extract with clear links to the clinic. Neither involves human patients.
The first, by Gorczynski et al. in Immunology Letters (1998), looked at mice aged 8 to 110 weeks. As mice aged, their immune cells produced less interleukin-2 and more interleukin-6 and other cytokines. The extract partly reversed these shifts, but only when given continuously, and blocking nitric oxide production cancelled the effect. The author list includes T. Waelli, the name of the clinic’s then chief physician, Thierry Wälli.
The second, by Müller et al. in International Immunopharmacology (2005), purified fractions from the extract and tested them on mouse spleen cells and macrophages in the lab. The fractions stimulated immune cells about as strongly as bacterial lipopolysaccharide (LPS), a potent trigger of inflammation. The authors found the activity was partly due to trace amounts of LPS in the liver extract itself, concentrated by purification. The work was supported by Clinique La Prairie, and one author’s listed affiliation is the clinic.
That second finding deserves a pause. A product whose immune effect in the lab is partly explained by bacterial endotoxin is not obviously a rejuvenation tonic. It might do something; it might do nothing when swallowed; it might do something undesirable in some people. Without human data, nobody outside the clinic can say.
The 2009 ELIXIR article also refers to clinic research in Immunology and Experimental Cell Research, but gives no titles, and we could not identify those papers. We also looked for trial registrations and published human studies of CLP Extract and found none.
One study the clinic has promoted is easy to confuse with the extract. In 2022, Life Length laboratories tested the clinic’s CLP Holistic Complex, a supplement blend now sold in shops, on human skin cells in a dish and reported slower telomere shortening. That is a different product, studied in cells, in partnership with the company that sells it. It tells us nothing about CLP Extract.
CLP Extract evidence table
| Study | Design | Participants | Intervention | Comparator | Endpoints | Results | Limitations | Conflicts of interest |
|---|---|---|---|---|---|---|---|---|
| Gorczynski et al., Immunology Letters, 1998 | Animal experiment with cell transfer | Mice of three strains, aged 8 to 110 weeks | Fetal sheep liver extract, given continuously | Untreated aged and young mice | Cytokine production by immune cells; serum nitrate | Age-related cytokine changes partly reversed; effect blocked by a nitric oxide inhibitor | Mice only; no clinical outcomes; formulation of that era, not today’s | Author list includes T. Waelli, matching the clinic’s then chief physician; funding not shown in the abstract record |
| Müller et al., International Immunopharmacology, 2005 | Laboratory study | Mouse cells (spleen cells, macrophages, tumor cell line) | Purified fractions of fetal sheep liver extract | LPS; LPS-unresponsive mouse strain | Cell proliferation, nitric oxide release, tumor cell growth | Strong immune cell activation, partly due to trace LPS in the extract | Cells in a dish; no oral dosing; no humans | Funded by Clinique La Prairie; one author affiliated with the clinic |
| Life Length / CLP Holistic Complex, 2022 (not peer reviewed) | Cell culture | Human skin fibroblasts | Supplement blend, not CLP Extract | Untreated cells | Telomere shortening over 8 weeks | Slower shortening reported, no figures published in coverage | Different product; cells only; no journal publication | Run in partnership with the clinic |
| Clinic-reported guest outcomes | None published | Not stated | Full Revitalisation program | None | Energy, sleep, mood, immunity | “Most guests report” improvements | No data, no control group, extract not separated from the rest of the week | Reported by the seller |
Is CLP Extract a regulated medicine?
We could not find a public statement of how CLP Extract is classified, whether as a medicine, a supplement or a preparation made and used within the clinic. The clinic’s pages do not say, and the 2009 ELIXIR report mentioned only that the lab worked “under Swiss public health supervision.”
The regulatory history around its ancestor is clearer. In 2015, the Swiss Federal Office of Public Health announced that Swissmedic had opened criminal proceedings against several providers of fresh-cell therapy, in which live cells from sheep fetuses or placentas are injected into muscle. Authorities said the products were not authorized, posed a considerable health risk and had no proven effect (swissinfo.ch, March 2015). No clinic was named.
The risks of the live-cell version are not theoretical. The US Centers for Disease Control and Prevention documented a Q fever outbreak among six travelers from New York and Canada who had received fetal sheep cell injections from a physician in Germany in 2014; some still had fatigue months later, and the report noted no published clinical evidence for the therapy’s claims (Robyn et al., MMWR, 2015).
To be clear: Clinique La Prairie says its extract is taken orally, and reporting since 2005 says it stopped using live cells in the 1990s. Nothing we found links the clinic to these cases. The point is narrower. The tradition CLP Extract descends from has been treated by regulators as unproven and, in its live-cell form, risky, and the clinic has not published what an outsider would need to judge the modern product on its own terms.
Extract, program or simply the week?
Suppose you leave Montreux sleeping better and feeling sharper. What caused it?
Revitalisation combines CLP Extract with vitamin therapy tailored to your blood results, an antioxidant injection, several supplement courses, a probiotic plan, careful meals, exercise, massage, a lake view and a week away from work. Any one of those could make you feel better. Correcting a genuine vitamin deficiency certainly can. Rest and good food certainly can. Expectation, after paying CHF 31,800, almost certainly does.
The only way to isolate the extract is a randomized, placebo-controlled trial: two groups doing the same week, one taking the extract and one a convincing dummy, with outcomes measured by people who don’t know who got what. That trial has not been published. Until it is, the improvements guests report belong to the whole package, not to the formula. Feeling better is not the same as a measured gain in healthspan.
How the Revitalisation claims grade
We used the six-level scale applied across our longevity coverage. The diagnostics are graded in our main review; this table covers the claims specific to Revitalisation.
| Claim or component | Our classification | Why |
|---|---|---|
| CLP Extract helps “regenerate the organism” | Insufficient evidence | No human trials; composition and mechanism undisclosed |
| Stronger immunity from the extract | Insufficient evidence | Mouse and cell data only, partly explained by endotoxin |
| Effects lasting 12 to 24 months | Insufficient evidence | No published follow-up data |
| Side effects “very rare” | Insufficient evidence | No published safety data to check against |
| FFS1-5 Activator, HP-Cellular Active, bio-stimulants | Insufficient evidence | No formulations or trials published |
| Better energy, sleep and mood after the week | Subjective wellness benefit | Plausible from rest, food and attention; not attributable to the extract |
| Vitamin therapy based on blood results | Established for a defined indication | Useful when a real deficiency is found |
| Gene Aging and epigenetic tests | Plausible mechanism, uncertain benefit | Aging biomarkers still lack agreed clinical validation (Moqri et al., Nature Medicine, 2024) |
For the diagnostic side in depth, see our guide to longevity clinic tests and which biomarkers are useful.
Safety: who should ask hard questions first
The clinic says the program is “medically supervised from start to finish” and that each guest has medical checks first. It publishes no contraindication list for Revitalisation.
If older reporting about an animal-derived extract is still accurate, allergy is the obvious question, and the 2009 account of two hours of monitoring after a dose suggests the clinic has considered it. Anyone who is pregnant or breastfeeding, has an autoimmune condition, takes immune-suppressing medicines, has had cancer, or has a serious allergy history should get answers in writing from the medical team, and talk to their own doctor before booking. The same goes for the injections and supplements in the program, whose ingredients are not listed on the program page.
What would make CLP Extract convincing
None of this proves the extract does nothing. It means the case has not been made in public. Four things would change our view: disclosure of what the product is and how it is made; its regulatory classification; a registered, placebo-controlled human trial with meaningful endpoints such as infection rates or vaccine response; and publication of the results whether or not they flatter the product.
Clinique La Prairie has the history, the money and the medical staff to do this. Until it does, I’d treat Revitalisation as a comprehensive check-up in a beautiful setting, with an expensive mystery ingredient attached.
Revitalisation in 2027: Proprietary Formula, Public Questions
This year Revitalisation remains a Montreux-only program, even as Clinique La Prairie expands through its Anji resort in China, city Longevity Hubs in Madrid, Dubai, Doha, Bangkok and Taipei, and a Phuket resort scheduled to open in November 2026 whose program list does not include Revitalisation. The clinic’s retail supplements, sold in the US at Bergdorf Goodman since October 2025, carry full ingredient lists and the standard FDA disclaimer that they are not intended to diagnose, treat, cure or prevent disease. CLP Extract still carries neither an ingredient list nor a published human trial. Meanwhile the testing that surrounds it is under sharper scrutiny: a US government study in Communications Biology showed consumer gut microbiome tests returning contradictory verdicts on identical samples.
Clinique La Prairie Revitalisation: questions answered
What is CLP Extract made of?
The clinic does not say. Independent reports from 2005, 2009 and 2020 describe an extract of fetal sheep liver; the clinic’s current materials call it a “perpetually updated” formula and give no composition.
Is CLP Extract an injection?
The clinic says it is taken orally, alongside “bio-stimulants.” The Revitalisation program separately includes an antioxidant injection and vitamin therapy, which are different products.
Has CLP Extract been tested in humans?
We found no published human trial or trial registration for the current formula. The peer-reviewed research we found was done in mice and in cells, with clinic involvement.
Is Revitalisation the same as Master Detox?
No. Master Detox, from CHF 20,950, focuses on nutrition, gut testing and a cleansing protocol and does not include CLP Extract. Revitalisation, from CHF 31,800, is built around the extract and broader medical screening.
How long do the effects of Revitalisation last?
The clinic says many guests feel positive effects for 12 to 24 months. It has not published data supporting that figure, and it cannot separate the extract from the rest of the week.
Is Revitalisation worth the money?
If you value the screening, the doctors’ time and the setting, the program offers real medical content. If you are paying for the extract specifically, you are paying for a claim without published human evidence. Our wider analysis is in are longevity retreats worth it?