Plasma Dilution dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
The mouse experiment that asked whether young blood is needed at all. Swapping half the plasma for salt water plus albumin, adding nothing young, matched what people credit to young blood.
Evidence grade for Plasma Dilution: Limited. The rule: people have taken it in a published study, but fewer than 100 of them. The sum on this page: 2 completed trials, 42 people given it. A grade counts how much has been done to people, not whether it works.
- People given it
- 42
- Human studies
- 2
- Found nothing
- 0
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
2 completed trials, 42 people given it
6 effects reported, 4 unwanted, 2 wanted, by people using it, not a trial
Goal pages: Fat loss and metabolism
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.
This swaps out half the plasma and puts back salt water with albumin. Nothing young is added. It is the check on whether young blood is needed at all.
What people take it for
- Reversing ageing, without paying for a young donor.
- Cheaper access, by using plasma donation as a stand in.
What studies in people showed
Nobody has had this done as an ageing treatment, and no trial of it is registered under that name. In mice, one swap matched or beat joining a young and an old animal together. It worked on muscle repair, on fat and scarring in the liver, and on new brain cell growth. In people, the nearest tests are plasma exchange trials, and they disagree. One, in 42 adults over 50 with albumin put back, found 15 ageing clocks reading younger. One, in blood donors with nothing put back, found three clocks reading older. That second one is the closest test of thinning on its own, and it points the other way.
What people report
Reports, not study results
The good
- Donation centres often pay the donor, so the cheap version costs nothing.
- People trying the donation route describe feeling clearer headed.
The bad
- Those clear headed reports are vague, with no measurement behind them.
- Clinic sessions are described at several hundred euros each, and people expect the practice to spread through medical tourism before any data exists.
- Careful posters say basic questions about how often and how much are still unanswered.
- There is no built up record of harm and none of benefit. Only individual impressions.
Where these come from: The cost and the clearer headed reports come from the forum patterns collected for this profile. The mouse and clock numbers come from the studies on this page.
My bottom line
The most important question in this field, asked properly in mice, and unsettled in people. Nobody has a protocol worth paying for.
An opinion, not a finding. I am a coach, not a doctor.
What it has been measured to do
What people using it report
Real people telling you what happened to them. Nobody checked it, and the people who post are not a fair sample, so it cannot prove anything works. It is still the best guide on this page to what people actually do with Plasma Dilution, what they expect, and what goes wrong. The full account, including the negative reports, is below.
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. The record on this one is set out below.
- Losing fat specifically1 animal or lab study
35 of the 36 indexed goals have no study of any kind behind Plasma Dilution
No study in people, animals or cells on this page reports a result for these. That does not prove Plasma Dilution does nothing for them. It does mean anything you have heard about Plasma Dilution and one of these did not come from a study cited here.
Show full evidence
What is Plasma Dilution?
The mouse experiment that asked whether young blood is needed at all. Swapping half the plasma for salt water plus albumin, adding nothing young, matched what people credit to young blood.
Nobody has had this done as an ageing treatment, and no trial of it is registered. The nearest thing in people is plasma exchange, which this site covers on its own page. That has real trials, two of which reported opposite results in 2025.
Everything in the young blood field assumes something in young plasma does the work. Plasma dilution is the check on that assumption. In a 2020 paper in Aging, researchers swapped half the plasma in mice for salt water with 5 percent albumin. They called it a neutral age blood exchange, because nothing young was added. The albumin only put back what the salt water would have washed out.
One swap matched or beat what joining a young and an old mouse does, on all the main measures: muscle repair, fat and scarring in the liver, and new brain cell growth in old mice. The authors also compared the proteins in blood from the mouse procedure and from the human procedure it resembles, plasma exchange. They report the body's signals being reset in both, with some proteins going up rather than down. In their lab test, old human blood normally stops young cells from dividing. After a single plasma exchange in a person, that blocking effect was gone. Their idea is that the blood carries proteins that feed back on their own production, and that watering them down resets whole networks of signals for a long time.
How does Plasma Dilution work?
Shown in mice only. The idea is that plasma carries proteins that feed back on their own production and on many signal routes. Watering them down resets those routes, and the change to gene activity lasts rather than fading as the levels come back. Albumin was added to the fluid to put back what salt water alone would have washed out. The authors say the added albumin does not look like the whole story. They point out that albumin levels do not fall with age and do not rise after the swap. None of this has been shown in a person.
What have studies in people found about Plasma Dilution?
Nobody has had the neutral blood exchange described in the mouse work, and no trial of it is registered under that name. The evidence in people that bears on the thinning idea comes from plasma exchange trials, covered on their own page, and those currently disagree with each other.
- Aging Cell 2025, 42 healthy adults over 50: plasma exchange with albumin put back, and in one group an immune protein drip added, gave younger readings on 15 epigenetic ageing clocks than the dummy procedure.
- Scientific Reports 2025, healthy blood donors, each trying two schedules in turn: plasma taken out with nothing put back gave no younger readings, and three clocks moved toward older. This is the method closest to pure thinning, and it did not repeat the mouse result.
- The 2020 mouse paper does report one observation in a person. A single plasma exchange removed the usual blocking effect of old blood on young cells dividing, in the authors' lab test. That is a lab test on human blood, not a health outcome.
What this does not tell you: The strongest test in people of thinning with nothing put back is the 2025 Scientific Reports trial, and it found no younger clocks. That is one small trial with one specific method, so it does not settle things. But it is the only direct check in people of this idea, and it points the other way. Nothing in the human record links any plasma exchange method to a health outcome rather than to a marker.
What do people who took Plasma Dilution report?
This is what real people say happened to them, good and bad. Nobody measured it. A report cannot tell a real effect from the lift people get just from expecting it to work, from a diet or training change made at the same time, or from what was really in the vial. We still put it near the top. It is the next best thing to a study in people: what happens when real people use it, including what goes wrong.
- Two quite different things get discussed under this heading. One is the clinical procedure of exchanging plasma for saline and albumin, and the other is ordinary plasma donation used as an improvised and much cheaper stand-in for it. People are generally clear about which they mean, and most of those describing personal experience are describing the second.
- What people report from donation-based attempts is vague and subjective, described in terms of feeling clearer headed, with no measurement behind it.
- Cost is the main practical theme and it runs both ways: donation centres commonly pay the donor, while clinic-administered exchange is described at several hundred euros per session, with the expectation openly stated that the practice will spread through medical tourism before any data exists.
- The community's own assessment, repeated by its more careful posters, is that basic questions about how often and how much remain unanswered, and that there is no commercial incentive to answer them. Nobody in this material claims a protocol is established.
- Negative reports here are mostly an absence of anything to report. There is no accumulated account of harm and no accumulated account of benefit, only individual impressions, and that is the honest state of the discussion.
Sources: AgingResearch and News threads on LongeCity, reached through site-restricted search extracts of the threads because the site itself would not load from this environment, September 2026. Nothing above is attributed to any specific post and no post is reproduced.
The state of the research
This page exists because it is the field's own check on itself, and it makes the young blood story harder, not easier. If swapping half the plasma for salt water and albumin does in mice what joining a young and an old animal does, then the active part may be taking old plasma out, not putting young plasma in. If that is right, every product sold on the young blood idea is selling the wrong half. The same authors point at what that would mean in practice. The route would be a procedure hospitals already do, plasma exchange, not a bought donor plasma product.
The human data we have do not settle it, and right now they lean against the simplest version. The 2025 trial closest to pure thinning, plasma taken from healthy blood donors with nothing put back, found the ageing clocks moving the wrong way. The 2025 trial that reported younger clocks put albumin back in, and in its strongest group added an immune protein drip. That is not thinning on its own. Both trials are small. This site publishes both and does not pick a winner.
The evidence, in charts
Fig. 1a · how many people
42people, across 1 study in people cited here
| Study | People | Share |
|---|---|---|
| Aging Cell 2025 | 42 | 100% |
The whole total is one study of 42. 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. 1 more study in people gives no headcount and is not counted here. Studies still signing people up are left out, and only studies cited on this page are counted.
Fig. 1b · evidence mix
2 of 4 sources here are studies in people. The rest are not.
- Study in people · done in people250%
- Animal study · done in animals250%
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 3 different years, 2011 to 2025, 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
- Procedure
- Molecule weight
- Not on file
- Half-life
- None on file
- Chain length
- None on file
No amino acid sequence is on file for Plasma Dilution, which is expected: a procedure is not built from amino acids.
The studies we cite
- Study in people2025Multi-Omics Analysis Reveals Biomarkers That Contribute to Biological Age Rejuvenation in Response to Single-Blinded Randomized Placebo-Controlled Therapeutic Plasma Exchange
The nearest human test of the dilution idea did not test dilution. 42 healthy adults over 50 were split by chance between plasma exchange every two weeks, with or without an immune protein drip, exchange monthly, or a dummy procedure. Fifteen epigenetic ageing clocks read younger than the dummy group, best on the two-week schedule with the immune protein. But the plasma that was removed was replaced with albumin. Diluting the blood and swapping the blood are not the same experiment.
42 healthy adults over 50 randomised to biweekly plasma exchange with or without intravenous immunoglobulin, monthly exchange, or placebo. Fifteen epigenetic clocks showed rejuvenation versus placebo at false discovery rate below 0.05, strongest in the biweekly plus immunoglobulin arm. This is the nearest human test of the dilution idea, and it replaced the removed plasma with albumin.
- Study in people2025Human clinical trial of plasmapheresis effects on biomarkers of aging (efficacy and safety trial)
The one study that took plasma out without putting anything back found the opposite of rejuvenation. Healthy blood donors had 8 or 4 plasma sessions over 18 weeks, each person trying both in turn, with no young plasma and no albumin replacement. No epigenetic rejuvenation appeared at all. Three ageing measures went the wrong way. This is the closest human test of dilution on its own, and it runs against the idea.
Randomised crossover in healthy blood donors, 8 versus 4 plasmaphereses over 18 weeks with no young plasma and no albumin replacement. No epigenetic rejuvenation was found. DNAmGrimAge, the Hannum clock and the Dunedin Pace of Aging all increased. This is the closest human test of dilution without replacement, and its result runs against the dilution hypothesis.
- Animal study2020Rejuvenation of three germ layers tissues by exchanging old blood plasma with saline-albumin
In mice, half the plasma was swapped for salt water with 5 percent albumin. Nothing from a young animal was added. That single swap matched or beat joining a young and an old mouse together, on muscle repair, on fat and scarring in the liver, and on new brain cell growth in old mice. Comparing the proteins in mouse and human blood after the swap showed the body's signals being reset, with some proteins going up rather than down. Funded by the US National Institutes of Health with other support.
Mouse. A single exchange of half the plasma volume for saline with 5 percent albumin, adding nothing from a young animal, met or exceeded the effects of heterochronic blood sharing on muscle repair, liver adiposity and fibrosis, and hippocampal neurogenesis in old mice. Comparative proteomics on mouse and human exchanged serum showed a resetting of systemic signalling, with some proteins elevated rather than reduced. NIH funded with non-US government support.
- Animal study2011The ageing systemic milieu negatively regulates neurogenesis and cognitive function
In mice, joining a young and an old animal's blood supply showed that something carried in blood can slow or speed up the growth of new brain cells, depending on age. Old plasma made a young mouse's brain adapt less well and harmed its memory. The thinning experiment reads this result a different way. If old blood is what blocks things, taking it out may matter more than adding young blood.
Mouse. Heterochronic parabiosis showed that blood-borne factors inhibit or promote adult neurogenesis in an age-dependent way, and that old plasma impairs synaptic plasticity and memory in young mice. This is the result that the dilution experiment reinterprets: if old blood is inhibitory, removing it may matter more than adding young blood.
Common questions
What is the Plasma Dilution dosage?
No human dose established. Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose. 2 completed trials, 42 people given it
Is Plasma Dilution FDA-approved?
Not approved anywhere as an ageing treatment, and no human study is registered under this name. A closely related procedure in people, therapeutic plasma exchange, is an established medical treatment used for its own set of conditions.
Does removing old blood work as well as adding young blood?
In mice, in one 2020 paper, yes. A single swap of half the plasma for salt water plus albumin matched or beat young blood on muscle repair, liver fat and scarring, and new brain cell growth. In people the question is open, and the trial that came closest to testing pure thinning found no benefit.
Has plasma dilution been tested in people?
Not under that name. The closest tests in people are plasma exchange trials. A 2025 trial that put albumin back reported younger readings on 15 ageing clocks in 42 adults, against a dummy procedure. A 2025 trial in blood donors that put nothing back found no change, and three clocks moved toward older.
Why does this matter for young plasma clinics?
Because if thinning is what does the work, the young donor is not doing anything. That would mean the thing with evidence behind it is a procedure hospitals already do, not a plasma product you buy. The mouse data support that reading. The human data so far do not confirm it.