Peat therapy — the natural treasure of Mariánské Lázně
Anyone who steps into a peat bath for the first time remembers the moment. The warm, dark, velvety mass envelops the body in a way water cannot imitate. It smells of forest, of earth, of something ancient. What looks like a luxury is in fact one of the oldest healing methods in Central Europe — and, for some diagnoses, one of those now being examined in controlled studies.
In Mariánské Lázně (Marienbad), peat therapy holds a special place. The town is famous for its mineral springs, but spa physicians regard the peat from the Slavkov Forest as an equally valuable natural resource. Water and peat form the pair around which the Marienbad cure has been built for two centuries.
This article describes where the peat comes from, how the individual treatments work, for which diagnoses the spa physician prescribes them and what research says about their effect. Whether peat treatments are included in the treatment plan is always decided by the spa physician after the initial examination.
Where the peat comes from
The Slavkov Forest — the quiet peat bogs of Europe
The Slavkov Forest stretches south-east of Marienbad and is among the most sparsely populated areas of Central Europe. At altitudes between 600 and 800 metres lie extensive raised bogs that have been growing since the last ice age — more than 10,000 years of plant deposits, layer upon layer.
Peat consists of partially decomposed plant remains: sphagnum moss, cotton grass, sedges and heather. In an oxygen-poor, waterlogged environment, organic matter decomposes only incompletely. The result is a dark, finely fibrous substrate that formed over millennia without any human involvement.
Sustainable extraction
Peat extraction for the Marienbad spa houses is subject to environmental regulations. Only designated areas are used, and these are restored after extraction. Used peat is not thrown away — it is returned to regeneration tanks, where it matures again over several years. This circular principle has been applied in Marienbad since the 19th century.
What makes Marienbad peat exceptional
Not every peat is suitable for therapeutic use. Marienbad moor has several properties for which the spa uses it:
- Organic composition — It contains humic acids, fulvic acids and mineral salts. A randomised trial that compared a peloid in direct contact with the skin with the same peloid applied through a film found better results for pain and stiffness at 6 months in the direct-contact group; this suggests that, alongside heat, the chemical composition also contributes to the effect (Adıgüzel et al., 2022, Int J Biometeorol).
- Low thermal conductivity — Peat releases heat slowly and evenly. That is why a bath at around 40 °C feels pleasantly warm, whereas a water bath at the same temperature would be uncomfortable for most people.
- Prepared with mineral water — Before the treatment, the peat is mixed with local mineral water to the prescribed consistency and temperature.
Forms of treatment
Peat bath (full-body)
The classic peat bath is the heart of Marienbad peloid therapy. The patient steps into a tub filled with a mixture of finely processed peat and warm mineral water. The temperature ranges between 38 and 42 °C, and the treatment lasts 20 to 30 minutes.
What happens: The heat penetrates the body gradually. The blood vessels in the skin and subcutaneous tissue dilate, muscle tension releases and the sensitivity of painful nerve endings falls. The bath is followed by a thorough shower and at least 30 minutes of rest. Many guests describe a pleasant warmth lasting for hours and deep sleep the following night.
Peat pack (local application)
With a local pack, the warm peat paste is applied directly to the affected areas — typically painful joints or the back. The treated area is covered with a film and towels to retain the heat.
Packs allow more targeted application than full-body baths. The temperature can be somewhat higher locally than in a full-body bath, because the heat acts only on the affected area. The application time is 20 to 40 minutes. This form is used for local joint complaints — knee osteoarthritis, shoulder pain, back pain.
Peat wrap
With wraps, a thinner layer of peat is applied to larger areas of the body and wrapped firmly in cloths. This method combines the thermal effect of peat with a mild compression effect. The spa physician prescribes wraps particularly for rheumatic diseases in their quiescent phase and for chronic muscle tension.
Indications — when the spa physician prescribes peat
Disorders of the musculoskeletal system
Disorders of the locomotive system form group VII of the Czech indication list (Decree No. 2/2015 Coll.), and peat treatments are the foundation of the Marienbad programme for them. The group includes osteoarthritis of the knee and hip (VII/7) and osteoarthritis in other locations (VII/8), chronic back pain of functional origin (VII/9), rheumatoid arthritis and ankylosing spondylitis treated in their quiescent phase (VII/1–2), painful syndromes of tendons and muscles (VII/6) and conditions after injuries and orthopaedic surgery including joint replacements (VII/10–11). The full overview is on the page Indications and contraindications.
The largest number of controlled studies exists for osteoarthritis. In an Italian randomised trial with 80 patients with knee osteoarthritis, a two-week cycle of peloid packs and baths reduced pain, improved function and reduced the use of painkillers, for a period of 9 months, while the control group did not change (Fioravanti et al., 2010, Am J Phys Med Rehabil). In hand osteoarthritis, 12 daily applications with baths gave better pain and function than the control, and the difference in function and medication use lasted 6 months (60 patients, Fioravanti et al., 2013, Int J Biometeorol). A Lithuanian randomised trial with 92 patients added ten peloid applications or mineral baths to physiotherapy and, one month after treatment, found better walking speed, muscle strength, range of motion and pain than with physiotherapy alone (Varzaityte et al., 2019, Int J Biometeorol). A meta-analysis of 21 studies confirms improvement in function and pain in knee osteoarthritis, but stresses that peloids do not replace conventional treatment (Mennuni et al., 2021, Clin Ter). A systematic review of spa treatment for knee osteoarthritis as a whole reports an effect on pain and function that is clinically meaningful for 3 to 6 months, sometimes up to 9 (Forestier et al., 2016, Ann Phys Rehabil Med). The studies are covered in more detail in the article on musculoskeletal treatment.
For chronic back pain, peat packs are combined with baths and exercise. In a French randomised trial with 102 patients, spinal mobility improved and medication use fell after three-week spa treatment; pain relief lasted 9 months, but functional scores returned to baseline (Guillemin et al., 1994, Br J Rheumatol).
For fibromyalgia there are two randomised trials directly with peloids. A cycle of 12 peloid packs with baths improved disease impact, tender point count and other measures in 80 patients, still at 16 weeks; the control group received no treatment and the trial was not blinded (Fioravanti et al., 2007, Rheumatol Int). In a Turkish trial with 70 women, adding two weeks of packs and warm baths to an education programme improved pain, fatigue and stiffness after treatment and at one month; at three months the difference was no longer significant (Bağdatlı et al., 2015, Int J Biometeorol).
For rheumatoid arthritis and ankylosing spondylitis, peat is part of a programme that complements medication led by the rheumatologist; treatment takes place only during quiescent periods of the disease, never during a flare. After joint replacements and spinal surgery, gentle warm treatments are added as a complement to exercise in the pool and individual physiotherapy.
What happens in the body
Warming the tissues dilates the blood vessels, releases muscle tension and reduces the sensitivity of painful nerve endings. A German randomised trial with 52 patients with knee osteoarthritis observed, after nine peat wraps over 21 days, a fall in pro-inflammatory interleukin 1β and a rise in anti-inflammatory interleukin 10, while the common marker CRP did not change; pain and function improved at the same time (Klemm et al., 2020, Phys Med Rehab Kuror). A systematic review of 27 double-blind studies concluded that mineral water or peloid gave longer-lasting improvement in pain and function than plain water or "non-mineral" peloid, but that the exact mechanism cannot be settled because of the heterogeneity of the studies (Morer et al., 2017, Int J Biometeorol).
Skin diseases
Atopic eczema (X/1) and generalised or arthropathic psoriasis (X/2) are among the official indications for spa treatment in Marienbad, and peloid wraps are part of the treatment programme for them, alongside mineral baths, climate therapy and phototherapy. Treatment takes place in the stable phase of the disease, not during an acute flare. Details can be found in the article on spa treatment of skin conditions.
How a peat bath works — step by step
- Arrival for the treatment — The bath attendant prepares your tub. The peat is mixed with mineral water to the right consistency and the prescribed temperature.
- Entering the tub — You lower yourself slowly into the bath. Peat is dense and heavy — buoyancy is lower than in water, and the sensation more intense. Within a few minutes the warmth envelops the whole body.
- Treatment time — For 20 to 30 minutes you lie still in the bath. Most guests close their eyes and give themselves over to deep relaxation. The warmth is even and gentle — nothing like a hot bath at home.
- Showering — After the treatment, rinse the peat off thoroughly with warm water.
- Rest — Wrapped in warm towels, you rest for at least 30 minutes on a lounger. In this phase the treatment continues to work — the body stays warmed through, the circulation settles.
- The rest of the day — Plan no strenuous activities. Treatments build on one another, and the body needs time to adjust to the heat.
Comparison with other peloids
Peat vs. fango
Fango, a volcanic healing earth from Italy and South Tyrol, differs from peat in origin: fango is mineral, peat is organic. Fango is heated to higher temperatures and cools more quickly — its thermal effect is more intense but shorter. Peat releases heat more slowly and contains organic substances that fango lacks, particularly humic acids.
Peat vs. sea mud
Sea mud, for example from the Dead Sea, is rich in minerals and salts and is used mainly in dermatology. Peat has lower thermal conductivity by comparison, which makes it suitable for long, even warming of joints and muscles.
Practical information
Length of stay: The length of a covered stay is set by the indication list for the specific diagnosis: for osteoarthritis of the knee and hip (VII/7) and back pain (VII/9), the basic stay is 21 days in both comprehensive and contributory care; for rheumatoid arthritis (VII/1) 28 days in comprehensive care and 21 days in contributory care; for conditions after joint replacement (VII/10) 28 days; for atopic eczema (X/1) 21 days and for psoriasis (X/2) 28 days in comprehensive care. Self-paying guests agree the length with the spa physician; the specialist literature regards 2 to 3 weeks with 10 to 21 treatments as the usual length of spa treatment (Karagülle and Karagülle, 2021, Int J Biometeorol). The cited osteoarthritis studies worked with 9 to 12 peat applications over two to three weeks.
Contraindications: Peat baths and wraps are not given during acute inflammations and infections, with fever, in the acute stage of any disease, with clinical signs of circulatory failure or malignant arrhythmias, recent deep vein thrombosis, open wounds in the treated area or in pregnancy; malignant tumours with active disease are a general contraindication to spa care. The full list can be found on the page indications and contraindications. The spa physician assesses these circumstances at the initial examination and decides accordingly whether to include the treatment, and at what temperature and length.
Combination with other treatments: In Marienbad, peat therapy is combined with the drinking cure, CO₂ baths and exercise therapy. The osteoarthritis studies always worked with a combination of peloids and baths, often exercise too; the spa physician draws up an individual treatment plan that brings all the available resources together.
Costs: Individual peat baths can also be booked without a comprehensive spa stay. Within an Ensana treatment programme they are generally included in the package.
A natural resource with tradition and a future
Peat therapy is one of the oldest treatments in Marienbad and at the same time one of those now being tested in randomised trials — for osteoarthritis of the knee and hands, for back pain and for fibromyalgia. It does not restore cartilage or halt the course of the disease; according to the cited studies, however, it eases pain and stiffness for months and reduces the need for painkillers.
The Slavkov Forest continues to yield its treasure — gently extracted, carefully processed and applied with an expertise that only two hundred years of spa tradition can produce. Whether peat is the right path for you is decided by the spa physician at the initial examination.
