Volcanic Water and Longevity: The Science of Mineral Balneotherapy

Volcanic thermal water is groundwater that has circulated through igneous rock formations for thousands of years, dissolving specific minerals from cooled magma. It is not heated tap water with added salts: its composition is the result of an irrepeatable geological process that makes it distinct from any other water source. At Balneario de Cofrentes in Valencia, Spain, that volcanic process is the foundation of more than 120 years of thermal medicine practice.

Balneotherapy — the therapeutic use of these mineral-medicinal waters — has accumulated decades of clinical research. What science has confirmed is that the effects are not due to heat alone: the specific mineral composition activates biological mechanisms with direct relevance to healthy aging.

What Makes Volcanic Water Special?

The difference between a volcanic thermal spa and a hotel jacuzzi is not aesthetic: it is geochemical. Waters that emerge near volcanic structures have traveled underground circuits reaching several kilometres in depth, where temperatures of 200-400°C dissolve minerals from the earth's mantle that would never be present in surface water.

At Cofrentes, the extinct volcano that defines the landscape (the Caroig massif) impregnates the aquifer with a very specific mineralisation: high sulfate and chloride load, bicarbonates, free CO₂, with the presence of silicon, magnesium and traces of sulfur. This combination is not random — each element has a documented mechanism of action.

The water emerges from the spring at 35-38°C, classifying it as mesothermal (close to body temperature), which facilitates dermal absorption without the thermal stress of higher temperatures.

Mineral Composition: What Each Element Does

A review published in Applied Sciences (Aguilera et al., 2024) systematised the effects of the main ions present in volcanic thermal waters:

Mineral	Main Mechanism	Documented Effect
Sulfates (SO₄²⁻)	Inhibition of IL-2, IL-8, IL-17 and IFN-γ	Anti-inflammatory, immunomodulatory
Bicarbonates (HCO₃⁻)	Skin pH regulation, mild keratolysis	Dermal barrier regeneration
Chlorides (Cl⁻)	Cutaneous osmosis, deep hydration	Improved hydration and skin turgor
Free CO₂	Capillary vasodilation	Improved microcirculation, trophic effect
Silicon (SiO₂)	Collagen synthesis, oxidative protection	Dermal anti-aging, antioxidant
Magnesium (Mg²⁺)	Enzymatic cofactor, muscle relaxation	Muscle recovery, anti-inflammatory

Sulfates deserve particular attention. Sulfur in its various forms can inhibit T-lymphocyte proliferation and reduce the production of pro-inflammatory cytokines in a dose-dependent manner. In longevity medicine terms, this connects directly with the control of oxidative stress and the modulation of inflammaging — the chronic low-grade inflammation that accelerates all hallmarks of aging.

Mechanisms of Action: How Minerals Enter the Body

For decades, the medical community debated whether thermal immersion had systemic or only local effects. Today we know that both occur, through different pathways.

Dermal absorption: The skin is not an impermeable barrier. Minerals with small ionic radius (such as silicon and magnesium) penetrate through hair follicles and sweat glands, reaching the dermis and, to a lesser extent, systemic circulation. Heat potentiates this process: temperatures of 35-40°C increase cutaneous permeability by dilating pores and epidermal channels.

Hormetic pathway: An article published in International Journal of Molecular Sciences (Gálvez et al., 2018, PMID: 29899283) documents how immersion in sulfurous water activates the cellular hormetic response: mild and controlled stress that induces the synthesis of heat shock proteins (HSPs), activates the endogenous antioxidant system and regulates the immune response. It is the same principle that makes sauna or high-intensity exercise beneficial: dose makes the remedy.

Neuroendocrine system: Thermal immersion also modulates the HPA (hypothalamic-pituitary-adrenal) axis, reducing cortisol levels and activating the release of endorphins. Over time, this has implications for the control of inflammaging measurable through biomarkers such as hsCRP and suPAR.

A double-blind controlled trial published in In Vivo (Szenczi et al., 2023, PMID: 36881082) measured malondialdehyde (MDA) — an oxidative stress marker — in patients treated with thermal water versus tap water. Thermal water showed a protective effect against oxidative damage: MDA levels did not increase in the thermal group, compared to a significant increase in the control group (p=0.049).

120 Years of Thermal Medicine at Cofrentes

Balneario de Cofrentes has been in continuous operation since 1903. Over 120 uninterrupted years doing the same thing: using the volcanic water from this unique enclave of the Valencian Community to treat and prevent disease.

But the thermal history of Cofrentes is far older. Romans already used these waters: archaeological remains of imperial-era thermal installations exist at the site, making this spring one of the longest continuously used in the Iberian Peninsula.

The location is no coincidence. Cofrentes sits literally on an extinct volcano — the Caroig volcanic complex — whose geological structures maintain the heat and specific mineralisation of the water. Unlike spas that simply heat tap water, here the water is genuinely thermal: it emerges from underground already at 35-38°C with its mineral load intact.

Today the complex covers 200 hectares and employs over 290 staff including 50 medical professionals. In 2025 it hosted the LBF7 Spain international longevity congress. The transformation toward a clinical longevity model does not abandon what has worked for 12 decades: it adds the precision science of the 21st century on top.

Blue Longevity: Thermal Regions and Life Expectancy

Blue Zones — the regions of the world where people live longest and best — share well-documented characteristics: Mediterranean-style diets, daily physical activity, dense social life and sense of purpose. What is sometimes underestimated is the environmental and geological factor.

Three of the most frequently cited examples in longevity medicine have notable thermal presence:

• Japan (Okinawa and southern prefectures): The use of onsen (thermal baths) has been integrated into culture for centuries. Japan has the world's highest concentration of active thermal springs, and regions with stronger thermal traditions show longevity statistics above the national average. Japan's life expectancy is 84.3 years (WHO, 2024).
• Galicia (Spain): With over 300 catalogued thermal springs — the highest density in Western Europe — Galicia has one of Spain's highest rates of centenarians. Galician thermalism has been active since Roman times.
• Iceland: With omnipresent geothermal waters and bathing in them as a national practice (public thermal pools, sundlaugar, are basic infrastructure), Iceland has a life expectancy of 83.1 years and one of Europe's highest rates of centenarians.

This correlation is not direct causation — longevity is multifactorial — but it is suggestive. Dan Buettner, in his original Blue Zones analysis for National Geographic (2004), identified water as an environmental factor in several of them. A review in PMC (Buettner & Skemp, 2016, PMID: 27784170) analysed common factors, finding that the natural environment (including access to mineral water sources) appears recurrently.

The hypothesis in modern thermal medicine is that regular exposure to mineral waters rich in sulfates, bicarbonates and silicon chronically modulates markers of systemic inflammation — and inflammatory aging is today the central mechanism of all accelerated aging hallmarks.

Integrated Thermalism: When Water Works With the Clinic

21st-century thermalism at Progevita does not function as an isolated therapy: it is the substrate on which the most advanced longevity protocols operate. The logic is straightforward: volcanic water prepares the system to receive other interventions.

Three synergies with emerging clinical evidence:

Thermalism + NAD+ Therapy: Thermal immersion activates metabolic pathways (AMPK, sirtuins) that are also targets of NAD+ supplementation. By reducing baseline oxidative stress through balneotherapy, cells are better positioned to benefit from the regenerative impulse of intravenous NAD+.

Thermalism + Plasmapheresis: Plasmapheresis eliminates inflammatory proteins from plasma. Thermalism reduces systemic inflammatory load. Applied in sequence — balneotherapy first, plasmapheresis after — the plasma "canvas" on which the exchange acts is cleaner, and the impact is amplified.

Thermalism + Ozone therapy: Both therapies act on the same axis: reducing oxidative stress and modulating immunity. Ozone therapy induces controlled oxidative stress that activates the Nrf2 system; balneotherapy with sulfurous waters does something similar through the hormetic pathway. Combined, the anti-inflammatory effect is synergistic.

If inflammaging — detectable through hsCRP, suPAR and IL-6 — is the common denominator of accelerated aging, then any intervention that reduces it through multiple simultaneous pathways has greater impact potential than each one in isolation.

Scientific Evidence: What the Studies Say

Research in balneotherapy has matured over the last decade. It is no longer just centuries of empirical medicine; there are clinical trials, systematic reviews and meta-analyses.

Key evidence:

• Matsumoto S. (2018, PMID: 30259887): Review of balneotherapy in rehabilitation medicine. Documents effects on musculoskeletal, cardiovascular, metabolic and neurological diseases. Common mechanism: activation of anti-inflammatory responses and neuroendocrine modulation.
• Gálvez I et al. (2018, PMID: 29899283): Theoretical framework for thermal hormesis: how sulfurous water and heat activate HSPs, reduce MDA (oxidative stress) and modulate the immune system through mild stress response.
• Szenczi A et al. (2023, PMID: 36881082): Double-blind controlled trial: thermal water is protective against oxidative stress compared to tap water. MDA levels did not increase in the thermally treated group (p=0.049).
• Protano C et al. (2024, PMID: 38530467): PRISMA systematic review of balneotherapy in dermatological diseases. Eight studies included, all showing significant symptom improvement. Effects attributed to the physicochemical properties of water, especially sulfates and bicarbonates.
• Aguilera L et al. (2024): Review of minerals and trace elements in thermal waters and skin health. Benefits linked mainly to chloride, sulfate and bicarbonate content; calcium, sodium and magnesium; and trace elements including boron, selenium, strontium, manganese and zinc.

Frequently Asked Questions About Volcanic Water and Longevity

What distinguishes volcanic spring water from regular thermal water?

Volcanic water has circulated through igneous rock formations, dissolving magma minerals such as sulfates, silicon and bicarbonates in concentrations not found in surface water. This specific composition determines its biological effects. Not all thermal waters are volcanic: some are meteoric (rainwater heated geothermally), but volcanic waters have higher mineral load and more specific composition.

How many days of balneotherapy are needed to see measurable benefits?

The most relevant studies use protocols of 10 to 21 days of balneotherapy to observe biomarker changes. Within Progevita's programme context (4-7 nights), daily immersion produces measurable acute effects — muscle tension reduction, improved peripheral circulation, antioxidant system activation — although changes in systemic inflammatory markers require longer or repeated exposure.

Are there contraindications to volcanic thermal water immersion?

Yes. Hot water immersion is contraindicated in decompensated heart failure, uncontrolled severe hypertension, acute infectious processes, first-trimester pregnancy and certain active dermatological conditions. At Progevita, all participants undergo a prior medical assessment that includes suitability for thermal protocols.

How does balneotherapy combine with longevity treatments at Progevita?

At Progevita, balneotherapy is part of the wellness protocol complementing advanced medical treatments. Access to thermal water integrates with NAD+ IV sessions, ozone therapy, plasmapheresis and biomarker diagnostics. The sequence and combination is personalised according to each patient's profile, determined at the initial assessment.

What biomarkers improve with regular thermal therapy?

Studies have documented reductions in malondialdehyde (MDA, oxidative stress marker), improvements in antioxidant enzyme activity (catalase, superoxide dismutase, glutathione peroxidase), and modulation of pro-inflammatory cytokines (IL-2, IL-8, IL-17). In terms of longevity markers, reduction of systemic oxidative stress is the most consistently documented effect.

References

1. Matsumoto S. Evaluation of the Role of Balneotherapy in Rehabilitation Medicine. J Nippon Med Sch. 2018;85(4):196-202 (PMID: 30259887)
2. Gálvez I, Torres-Piles S, Ortega-Rincón E. Balneotherapy, Immune System, and Stress Response: A Hormetic Strategy? Int J Mol Sci. 2018;19(6):1687 (PMID: 29899283)
3. Szenczi A et al. Is Balneotherapy Protective Against Oxidative Stress? A Pilot Study. In Vivo. 2023;37(2):774-778 (PMID: 36881082)
4. Protano C et al. Balneotherapy using thermal mineral water baths and dermatological diseases: a systematic review. Int J Biometeorol. 2024;68(6):1073-1084 (PMID: 38530467)
5. Aguilera L et al. Unveiling the Role of Minerals and Trace Elements of Thermal Waters in Skin Health. Applied Sciences. 2024;14(14):6291
6. Buettner D, Skemp S. Blue Zones: Lessons From the World's Longest Lived. Am J Lifestyle Med. 2016;10(5):318-321 (PMID: 27784170)
7. Bender T et al. Effect of balneotherapy on the antioxidant system — a controlled pilot study. Wien Klin Wochenschr. 2007;119(13-14):461-465 (PMID: 17174729)

This article is for informational purposes and does not replace individual medical consultation.

Want to experience the volcanic thermalism of Cofrentes as part of a personalised longevity protocol? Talk to our medical team and design your programme at Balneario de Cofrentes, Valencia.