Longevity Medicine
What Is Klotho?
Last reviewed: May 2026 · Haute MD Editorial Team
Klotho is a protein discovered in 1997 and named after the Greek mythological figure who spins the thread of life. It exists in two main forms — a membrane-bound form (primarily in kidney) and a soluble circulating form — and influences mineral metabolism, insulin signaling, oxidative stress, and brain function. Klotho-deficient mice show striking premature-aging phenotypes; Klotho-overexpressing mice live 20-30% longer than normal.
What Klotho does in the body
Klotho was originally identified through a mouse mutation that produced rapid multi-system aging — atherosclerosis, osteoporosis, skin atrophy, infertility, emphysema, cognitive decline — and shortened lifespan to about 2 months versus normal 2-3 year mouse lifespan. Conversely, mice engineered to overexpress Klotho live 20-30% longer than controls. Klotho functions include: (1) co-receptor for fibroblast growth factor 23 (FGF23), regulating phosphate and vitamin D metabolism in kidney; (2) inhibitor of insulin/IGF-1 signaling — the same pathway whose suppression extends lifespan in many model organisms; (3) anti-oxidant and anti-inflammatory effects; (4) protection against vascular calcification; (5) neuroprotection — soluble Klotho crosses the blood-brain barrier and supports synaptic function and cognition. Klotho levels decline with age in most tissues and correlate with kidney function, cardiovascular health, and cognitive performance in human studies.
Klotho in human aging and disease
Observational human data: higher circulating Klotho levels are associated with better cognitive function in older adults, lower risk of cardiovascular disease, better kidney function, and lower all-cause mortality. Genetic variants in the KL gene (encoding Klotho) modulate circulating levels — the 'KL-VS' variant is associated with higher Klotho expression and is overrepresented in centenarian populations and associated with better cognitive aging. Klotho deficiency is implicated in chronic kidney disease (CKD) — Klotho expression drops dramatically in CKD, and the resulting dysregulation of phosphate and FGF23 drives vascular calcification and cardiovascular mortality in kidney disease patients. In Alzheimer's research, Klotho levels in cerebrospinal fluid decline with age and with disease progression; experimental Klotho supplementation in animal models improves cognition and synaptic function.
How to influence Klotho levels
Lifestyle factors associated with higher Klotho: (1) regular aerobic exercise — multiple studies show exercise raises circulating Klotho, with the effect proportional to training intensity and duration; (2) Mediterranean-pattern diet and high vegetable/polyphenol intake; (3) vitamin D sufficiency (Klotho expression interacts with vitamin D signaling); (4) avoiding chronic kidney injury — manage blood pressure, blood glucose, and avoid nephrotoxic exposures; (5) reducing chronic inflammation through diet, exercise, and sleep; (6) some emerging evidence for caloric restriction and intermittent fasting. Investigational interventions: recombinant Klotho administration has shown cognitive benefits in animal models and is in early human investigation; gene therapy approaches to raise Klotho expression are in preclinical development. As of 2026, there is no FDA-approved Klotho therapy and no validated supplement that raises Klotho levels reliably. The best practical approach is to support endogenous Klotho through the same lifestyle factors that drive longevity broadly — particularly aerobic exercise and metabolic health.
Frequently Asked Questions
Can I measure my Klotho level?
Yes, blood Klotho can be measured by specialized laboratories, though it is not part of standard or even most longevity-clinic panels. Cost is typically $200-$500. The clinical utility is limited because reference ranges are not well established and intervention pathways to raise levels are mostly lifestyle-based.
Are there Klotho supplements that work?
No supplement reliably raises Klotho. Some products marketed as 'Klotho boosters' contain general anti-aging ingredients with no specific evidence for Klotho elevation. Lifestyle factors — particularly aerobic exercise, vitamin D sufficiency, and metabolic health — are the only currently validated ways to support Klotho levels.
How does exercise raise Klotho?
Aerobic exercise stimulates kidney Klotho expression and increases circulating soluble Klotho. Multiple studies show consistent training (especially moderate-intensity aerobic) raises Klotho with effects proportional to volume and intensity. Sedentary individuals have measurably lower Klotho than active counterparts of the same age.
Will Klotho-based therapies be available in the future?
Active research. Recombinant Klotho protein, Klotho gene therapy, and small molecules that raise endogenous Klotho expression are in various stages of preclinical and early clinical development for cognitive aging, chronic kidney disease, and general longevity. Clinical availability for longevity indications is likely several years away minimum.
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