Klotho dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
Nobody has given klotho to a person in a published study. People with higher blood levels tend to live longer and think better. A gene therapy is heading toward studies in people. Products sold online as klotho peptide are not the protein that was studied.
Evidence grade for Klotho: Preliminary. The rule: studied in people, but no published study has had people take it. The sum on this page: 2 human studies where nobody was given it. A grade counts how much has been done to people, not whether it works.
- People given it
- 0
- Human studies
- 0
- Found nothing
- 0
Dose
No human dose established
No published study on this page has given this compound to people and reported a result.
2 human studies where nobody was given it
No first-hand reports gathered yet. That is a gap in what we have collected, not a finding that nothing has been reported.
Goal pages: Brain, memory and mood, Ageing and longevity
In plain English
In plain English, from Aaron
This is how I would explain it to a friend. The evidence, with the numbers, is further down the page.
Klotho is a protein your kidneys and brain make. A loose form floats in your blood. People with more of it tend to think better and live longer. Nobody has given it to a person in a published study. Products sold online as klotho peptide are not this protein.
What people take it for
- Sharper memory.
- Living longer.
- Slowing kidney and brain ageing.
What studies in people showed
In people, the only real study watched rather than treated. 804 adults aged 65 and over in Italy had klotho measured and were followed for six years. Those with the lowest levels were more likely to die. That is a link, not proof. A 21-person safety study of an mRNA klotho treatment began in 2026. It has no results. In old monkeys, one low dose helped memory, but the high dose did not. In mice, extra klotho meant a longer life. A gene therapy made male mice live 19.7 percent longer.
What people report
Reports, not study results
The good
- We have not collected user reports on this one yet.
The bad
- Klotho peptide products sold online, at about $500 for 20 micrograms, are short fragments with no published data in people.
Where these come from: The study results are from this page. The warning about online products is from the overview on this page. We have not collected user reports for this one yet.
My bottom line
The real protein is huge, and a tiny vial of a fragment will not do what it does. Save your money. Exercise has been linked to higher klotho in small studies, and it is worth doing anyway.
An opinion, not a finding. I am a coach, not a doctor.
What it has been measured to do
Animal and lab work, not yet tested in people
Real results, but from animals or cells, not people. What works in a mouse often does not work the same way in a person. Nobody can patent this, so nobody would ever earn back the cost of a study in people. That is usually why there is none.
- Living longer2 animal or lab studies
- Memory and thinking1 animal or lab study
34 of the 36 indexed goals have no study of any kind behind Klotho
No study in people, animals or cells on this page reports a result for these. That does not prove Klotho does nothing for them. It does mean anything you have heard about Klotho and one of these did not come from a study cited here.
Show full evidence
What is Klotho?
Nobody has given klotho to a person in a published study. People with higher blood levels tend to live longer and think better. A gene therapy is heading toward studies in people. Products sold online as klotho peptide are not the protein that was studied.
First, a mix-up almost every article makes. Alpha-klotho and beta-klotho are different genes that make different proteins. This page is about alpha-klotho, a protein made mostly in the kidney and brain. It works with a hormone called FGF23. Beta-klotho works with FGF21 and belongs to a different story. When you read about klotho anywhere else, check which one is meant.
Alpha-klotho sits in the wall of the cell, and a loose form of it floats in the blood. In people, higher blood klotho goes with better thinking and a lower risk of death. In one study of 804 adults aged 65 and over in Italy, those with the lowest levels were more likely to die over six years. That shows a link, not a cause. The first tests in people have only just started. In February 2026 Klothea Bio began a 21-person safety study of AKL003, an mRNA form of alpha-klotho, in Honduras. Klotho Neurosciences is making a gene therapy, KLTO-202, for ALS. Minicircle sells an offshore klotho gene therapy. There is no approved klotho drug.
In animals the picture is stronger. Mice without it age fast, and mice with extra live longer. In a 2023 study in old monkeys, one shot of klotho improved memory. One detail from that study rarely makes it into the news. The low dose worked and the high dose did not. That pattern usually means nobody yet understands how it works. A 2025 study found that one dose of a klotho gene therapy made male mice live 19.7 percent longer.
The real alpha-klotho protein is large, about 130 kDa and 998 amino acids long. Products sold as klotho peptide or alphaKlothoLR, at about $500 for 20 micrograms, are short lab-made pieces or unrelated peptides. They cannot come close to the doses used in animal studies, and they have no published data in people.
How does Klotho work?
Loose klotho in the blood works with the hormone FGF23. It also tunes the insulin and IGF-1 signals, the Wnt signal, and the body's defence against oxidation. Its drop with age is linked to ageing of the kidneys, blood vessels and brain.
The evidence, in charts
Fig. 1a · how many people
825people, across 2 studies in people cited here
| Study | People | Share |
|---|---|---|
| Journals of Gerontology Series A: Biological Sciences and Medical Sciences 2011 | 804 | 97% |
| Longevity.Technology 2026 | 21 | 3% |
One study holds 97% of these people, so the total rests more on one study than its size suggests. Counts are the number of people each study on this page says it signed up. That includes studies that only watched people and gave nobody the compound. Studies still signing people up are left out, and only studies cited on this page are counted.
Fig. 1b · evidence mix
2 of 6 sources here are studies in people. The rest are not.
- Study in people · done in people233%
- Animal study · done in animals467%
Counted from the list of sources on this page. It counts only what we cite, so there may be more studies out there. A review counts once, however many studies it sums up.
Fig. 2 · evidence over time
The studies cover 6 different years, 1997 to 2026, counted from the list of sources on this page.
Fig. 3 · legal status at a glance
US
Not approved
UK
Not approved
AU
Not approved
CA
Not approved
Not approved in any of the four countries shown. This is what the law says, not a verdict on the science. See Legal status below for the full text and any notes.
Fig. 4 · how much does what
Nobody has tested different amounts in people
This chart would show how the effect changes as the amount goes up. For this compound, nobody has measured that in people. So we leave it empty. We will not borrow an animal chart and pretend it works the same in people.
Fig. 5 · what the molecule is
- Kind of compound
- Biologic
- Molecule weight
- 116,181 Da for the 1,012 amino acid alpha-klotho protein (UniProt Q9UEF7); products sold as 'klotho peptide' are short fragments, not this protein
- Half-life
- Stated in words, not a numbersee the exact wording below
- Chain length
- None on file
Half-life as stated on file: Endogenous protein; therapeutic forms not yet defined in humans
No amino acid sequence is on file for Klotho, so none is drawn rather than guessed from a name.
The studies we cite
- Study in people2026Klothea initiates longevity-focused human trial of klotho therapy (AKL003)
A klotho therapy has reached people for the first time, and it has produced no results. Twenty one adults are taking part in an early safety study of an mRNA treatment meant to raise alpha-klotho. The study is built to look for harm, not benefit. Nothing sold online as a klotho peptide is this substance. No human has yet been shown to benefit from raising klotho.
21-adult Phase 1b safety study of mRNA alpha-klotho; no efficacy data yet.
- Study in people2011Plasma klotho and mortality risk in older community-dwelling adults
Nobody in this study was given anything. Researchers measured klotho in the blood of 804 adults aged 65 and over in Italy, then followed them for six years. Those with the lowest klotho levels were more likely to die during that time than those with the highest. Here is the problem. Watching people does not show cause. Low klotho may mark illness that is already there rather than create it, and this says nothing about whether raising it helps.
804 adults aged 65 and over in the InCHIANTI cohort, followed six years. After adjustment, those in the lowest tertile of plasma klotho (under 575 pg/mL) had a higher risk of death than the highest tertile (over 763 pg/mL), hazard ratio 1.78 (95% CI 1.20 to 2.63). Observational: it shows association, not that raising klotho extends life.
- Animal study1997Mutation of the mouse klotho gene leads to a syndrome resembling ageing
In mice: mice missing the klotho gene aged fast.
Klotho deficiency causes accelerated aging in mice.
- Animal study2005Suppression of aging in mice by the hormone Klotho
In mice: mice with extra klotho lived about 20 to 30 percent longer.
Overexpression extended lifespan by about 20 to 30%.
- Animal study2023Longevity factor klotho enhances cognition in aged nonhuman primates
In old rhesus monkeys: a single low dose of klotho improved memory.
A single low dose improved memory in aged rhesus monkeys.
- Animal study2025Single-dose AAV secreted-klotho gene therapy extends lifespan in adult mice
In mice: one dose of a klotho gene therapy made males live 19.7 percent longer, with benefits to bone, muscle and brain.
19.7% lifespan extension in males with bone, muscle and brain benefits.
Common questions
Has Klotho been tested in people?
Not in a completed trial cited here. 2 human studies where nobody was given it. Nobody has given klotho to a person in a published study. People with higher blood levels tend to live longer and think better. A gene therapy is heading toward studies in people. Products sold online as klotho peptide are not the protein that was studied.
What is the Klotho dosage?
No human dose established. No published study on this page has given this compound to people and reported a result. 2 human studies where nobody was given it
Is Klotho FDA-approved?
No approved product; a gene therapy that has not yet asked the FDA to start human studies (pre-IND)
Can you raise klotho naturally?
Exercise, enough vitamin D, and some blood pressure and diabetes drugs have been linked to higher klotho in small studies. None is proven to change health through klotho itself.
What is 'klotho peptide' sold online?
Usually a short lab-made fragment sold with the klotho name. No published studies in people show these products raise klotho or do anything the full protein does.
Is there a klotho drug?
Not yet. AKL003, an mRNA treatment, entered a 21-person safety study in 2026. KLTO-202, a gene therapy for ALS, has not yet been cleared to start studies in people. Nothing has shown a benefit in people.
Latest reading on Klotho
Blog posts about Klotho, newest first.
- Longevity / Sep 27, 2026 / 12 minPeptides for Longevity: What the Evidence Actually Shows in 2026
- Research / Sep 27, 2026 / 11 minNew Peptides and Longevity Compounds in 2026: What Is Actually New, What Is Newly Legal, and What Is Just New to Vendors
- Longevity / Sep 27, 2026 / 8 minKlotho Explained: Protein, Peptide, Gene Therapy or Supplement?