Klotho: The anti-aging protein that could rewrite longevity science

In 1997, Japanese researcher Makoto Kuro-o discovered something remarkable: a single gene mutation in mice caused them to age at an accelerated rate — developing atherosclerosis, osteoporosis, cognitive decline, and shortened lifespan all at once. He named the gene after Klotho, the Greek goddess who spins the thread of life.

The flip side was even more extraordinary. When researchers overexpressed the Klotho gene — boosting the protein it produces — mice lived 20 to 30% longer and showed resistance to age-related diseases across every organ system. In 2023, a single injection of Klotho protein enhanced memory in aged primates. In 2025, studies confirmed that higher Klotho levels in humans correlate with lower all-cause mortality, better cognitive function, and younger biological age.

Klotho is not a supplement you can buy. It’s a protein your body produces naturally — primarily in your kidneys and brain — and its levels decline predictably with age. But emerging research shows that how you live can significantly influence how much Klotho your body makes. And that makes it one of the most actionable discoveries in longevity science.

What you’ll learn:

What Klotho does and why it declines with age
How Klotho levels predict mortality, cognitive decline, and disease
Evidence-based strategies to increase your Klotho levels naturally
Why researchers consider Klotho a therapeutic target for aging

What is the Klotho protein?

Klotho is a transmembrane protein primarily produced in the kidneys, with secondary expression in the brain (choroid plexus), parathyroid glands, and other tissues. It exists in two forms:

Quick definition: Klotho is an anti-aging protein that circulates in your blood and protects against age-related decline in virtually every organ system — from your brain and heart to your kidneys and bones.

Membrane Klotho — anchored to cell surfaces, where it functions as a co-receptor for fibroblast growth factor 23 (FGF23), regulating phosphate and calcium metabolism
Soluble Klotho (s-Klotho) — cleaved from the membrane form and released into blood, urine, and cerebrospinal fluid, where it acts as a circulating hormone with systemic anti-aging effects

It’s the soluble form that has captivated longevity researchers, because it can be measured in blood and correlates with healthspan outcomes across populations.

How Klotho levels change with age

Klotho levels peak in childhood and begin declining in your 30s. By age 70, most people have approximately 50% less circulating Klotho than they had at 20. This decline parallels — and may partially drive — the age-related deterioration of organ function.

The decline is not purely genetic. Chronic kidney disease, diabetes, chronic stress, sleep deprivation, high-phosphate diets, and sedentary behavior all accelerate Klotho loss.

How Klotho protects against aging

Klotho doesn’t have one anti-aging mechanism — it has many, each addressing a different hallmark of aging.

1. Reduces oxidative stress

Klotho upregulates the body’s endogenous antioxidant defenses — particularly superoxide dismutase (SOD) and catalase — reducing the oxidative damage that accumulates with age and drives cellular senescence.

2. Suppresses chronic inflammation

Low Klotho levels are associated with elevated NF-kB signaling, the master switch of chronic inflammation. By modulating this pathway, Klotho reduces the “inflammaging” that underlies cardiovascular disease, neurodegeneration, and metabolic dysfunction.

3. Protects the cardiovascular system

Klotho preserves endothelial function and prevents arterial stiffness by:

Increasing nitric oxide production
Inhibiting vascular calcification
Reducing homocysteine-mediated damage

4. Regulates mineral metabolism

Through its partnership with FGF23, Klotho maintains phosphate balance. Excess phosphate accelerates vascular aging and calcification — a major driver of cardiovascular mortality.

5. Enhances cognitive function

Klotho in cerebrospinal fluid supports synaptic plasticity, BDNF signaling, and hippocampal function. In a landmark Nature Aging study (2023), a single low-dose Klotho injection improved memory in aged nonhuman primates — suggesting direct therapeutic potential for cognitive decline.

6. Supports kidney function

As the primary production site, the kidneys have a circular relationship with Klotho: healthy kidneys produce more Klotho, and more Klotho protects kidneys from fibrosis and damage. This is why chronic kidney disease is one of the strongest accelerators of Klotho decline and biological aging.

Klotho as a longevity biomarker

What the research shows

Finding	Study
Low Klotho predicts higher all-cause mortality	Multiple cohort studies, n > 10,000
Each standard deviation decrease in Klotho = 17% higher death risk	Semba et al., 2011
Low Klotho associated with faster cognitive decline	NHANES analysis, 2024
Klotho levels are lower in Alzheimer’s disease	Multiple studies
Exercise increases Klotho by 8 to 89%	Meta-analysis, 2022
Klotho overexpression extends lifespan 20–30% in mice	Kuro-o et al., 1997; Kurosu et al., 2005

Klotho vs other aging biomarkers

Unlike epigenetic clocks (which require specialized methylation assays) or PhenoAge (which uses a panel of blood tests), Klotho is a single protein that can be measured from a standard blood draw. While not yet part of routine clinical panels, several labs now offer s-Klotho testing.

What makes Klotho especially compelling is that it’s both a marker and a mediator — it doesn’t just predict aging, it actively drives it when deficient and protects against it when abundant.

How to increase Klotho levels naturally

1. Exercise — the most potent Klotho booster

Exercise is the single most effective known way to increase circulating Klotho levels. A 2022 meta-analysis in Scientific Reports found that exercise increased s-Klotho by 8 to 89%, regardless of exercise type or participant health status.

What works:

Aerobic exercise — running, cycling, swimming. Zone 2 training appears particularly effective
Resistance training — strength training after 40 increases Klotho and fights the sarcopenia that compounds Klotho loss
Combined training — the best approach for overall Klotho response
VO2 max — higher cardiorespiratory fitness correlates with higher baseline Klotho

Protocol: At least 150 minutes of moderate or 75 minutes of vigorous exercise per week, including 2+ strength sessions.

2. Protect your kidneys

Since the kidneys are the primary Klotho factory, kidney health = Klotho health.

Key strategies:

Stay well hydrated — chronic mild dehydration stresses the kidneys
Monitor creatinine and urea/BUN in regular blood work
Control blood pressure — hypertension is the #1 cause of kidney damage
Limit excessive NSAID use — ibuprofen and naproxen are nephrotoxic with chronic use

3. Reduce dietary phosphate

Excess phosphate directly suppresses Klotho expression. The biggest sources of excess phosphate aren’t natural foods — they’re phosphate additives in ultra-processed foods.

Practical steps:

Reduce processed food consumption
Check ingredient lists for phosphate additives (sodium phosphate, phosphoric acid)
Prioritize whole foods — fruits, vegetables, legumes, whole grains
Be mindful of dark cola beverages (high in phosphoric acid)

4. Prioritize sleep

Sleep deprivation increases inflammatory signaling (particularly IL-6 and TNF-α) that suppresses Klotho expression. Chronic poor sleep creates a feedback loop: less Klotho → more inflammation → worse sleep → even less Klotho.

Strategies:

Aim for 7–8 hours of quality sleep
Maintain consistent sleep/wake times
Address sleep apnea — a direct driver of Klotho decline

5. Manage chronic stress

Chronic cortisol elevation suppresses Klotho. Stress management isn’t optional for longevity — it’s physiologically necessary.

Evidence-based approaches:

Meditation — reduces cortisol and inflammatory markers
Regular exercise (double benefit)
Social connection — loneliness is a Klotho-suppressing stressor

6. Maintain vitamin D status

Vitamin D and Klotho have a synergistic relationship — vitamin D supports Klotho expression, and Klotho supports vitamin D activation. Low levels of one often predict low levels of the other.

The future: Klotho as therapy

Klotho research is moving from observational studies to therapeutic interventions:

Klotho injections — A single low-dose injection enhanced memory in aged primates (Nature Aging, 2023). Human trials are in planning stages.
Gene therapy — Delivery of the KL gene via viral vectors has shown promise in animal models of kidney disease and neurodegeneration.
Small molecule activators — Compounds that increase endogenous Klotho production are under development.
Exercise mimetics — Drugs that replicate the Klotho-boosting effects of exercise for people who cannot exercise.

While these therapies are still years from clinical availability, they represent a potential paradigm shift: treating aging itself as a modifiable condition, rather than treating age-related diseases one by one.

How SuperAge helps you monitor longevity biomarkers

Klotho levels aren’t yet trackable from a wearable — but many of the downstream effects of Klotho are. SuperAge monitors the metrics that Klotho influences:

Cardiovascular indicators

SuperAge tracks resting heart rate, HRV, and cardiovascular fitness trends — all influenced by Klotho’s vascular protective effects.

Biological age calculation

SuperAge’s biological age algorithm integrates the same health dimensions that Klotho modulates — cardiovascular fitness, metabolic health, and recovery capacity.

Exercise tracking

Since exercise is the #1 Klotho booster, SuperAge’s activity tracking helps you ensure you’re meeting the thresholds shown to increase Klotho levels.

Frequently asked questions

Can I get my Klotho levels tested?

Yes — soluble Klotho (s-Klotho) can be measured from a standard blood draw. Several specialty labs offer the test, though it’s not yet part of routine panels. Typical healthy adult levels range from 500 to 1,000 pg/mL, declining with age. Discuss testing with your healthcare provider if you’re interested in a baseline measurement.

Does Klotho decline cause aging, or does aging cause Klotho decline?

Both — it’s a bidirectional relationship. Age-related kidney decline reduces Klotho production, which accelerates aging processes, which further damages kidneys. This vicious cycle is why interventions that break the loop (exercise, kidney protection, stress management) have outsized effects.

Are there supplements that increase Klotho?

No proven supplement reliably increases Klotho in humans. Animal studies suggest potential for curcumin, resveratrol, and ginseng, but human evidence is lacking. Exercise remains the only well-validated intervention. Be skeptical of any product claiming to “boost Klotho.”

How does Klotho relate to other longevity pathways?

Klotho intersects with several key longevity pathways: it inhibits insulin/IGF-1 signaling (linked to lifespan extension in multiple species), activates AMPK (the metabolic master switch), and suppresses mTOR (the target of rapamycin). This interconnection is part of why Klotho has such broad anti-aging effects.

Key takeaways

Klotho is a master anti-aging protein produced primarily in the kidneys, with levels declining ~50% by age 70
Low Klotho predicts higher mortality, faster cognitive decline, and accelerated biological aging
Exercise is the #1 way to boost Klotho — increasing levels by 8 to 89% across studies
Kidney health, sleep, stress management, and vitamin D all support Klotho production
Therapeutic Klotho injections enhanced memory in aged primates, with human trials in planning

Take control of the factors that influence Klotho

You can’t inject Klotho yet — but you can exercise, protect your kidneys, manage stress, and sleep well. These are the same lifestyle factors that SuperAge helps you track and optimize every day.

Ready to start? Download SuperAge and monitor the cardiovascular, activity, and recovery metrics that reflect your body’s anti-aging capacity.

References

Kuro-o M, et al. “Mutation of the mouse klotho gene leads to a syndrome resembling ageing.” Nature, 1997. — Discovery of the Klotho gene.
Castner SA, et al. “Longevity factor klotho enhances cognition in aged nonhuman primates.” Nature Aging, 2023. — Single Klotho injection improved memory in aged primates.
Amaro-Gahete FJ, et al. “A systematic review and meta-analysis demonstrating Klotho as an emerging exerkine.” Scientific Reports, 2022. — Exercise increases Klotho 8–89%.
Semba RD, et al. “Plasma klotho and mortality risk in older community-dwelling adults.” Journals of Gerontology, 2011. — Klotho as mortality predictor.
Prud’homme GJ, et al. “Pathobiology of the Klotho Antiaging Protein.” Frontiers in Aging, 2022. — Comprehensive mechanism review.

Last updated: 2026-04-03. This article is regularly reviewed to ensure accuracy.