Therapeutic Plasma Exchange vs Plasma Dilution
Written by Aaron CuhaReviewed Sep 2026
The short answer
The clinical procedure, and the mouse experiment that explains why it might work at all. Both point at taking something out rather than putting something in. Two small 2025 trials of ageing blood markers on the clinical version reached opposite answers.
- Therapeutic Plasma Exchange people
- 389
- Therapeutic Plasma Exchange nulls
- 1
- Plasma Dilution people
- 42
- Plasma Dilution nulls
- 0
Dose
Approved medicine. No human dose established for unlabelled uses
Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose.
Therapeutic plasma exchange is an established medical procedure. A machine cleared for the job removes plasma, the liquid part of blood, and replaces it. It has accepted uses in some nerve, blood and kidney diseases. It is not approved anywhere for ageing, for lowering biological age or for Alzheimer disease.
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
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
Therapeutic Plasma ExchangeTherapeutic plasma exchange (plasmapheresis with albumin or albumin plus immunoglobulin replacement)
A standard hospital procedure that takes out plasma and puts a blood protein called albumin back. A 347-person trial in Alzheimer disease hit one of its two main goals. Two small 2025 trials of ageing markers came to opposite conclusions.
Column B
Plasma DilutionPlasma dilution (neutral blood exchange with saline and albumin)
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.
Side by side, on the facts we can check
| What we compare | Therapeutic Plasma Exchange | Plasma Dilution |
|---|---|---|
| Category | Longevity | Longevity |
| FDA status | Therapeutic plasma exchange is an established medical procedure. A machine cleared for the job removes plasma, the liquid part of blood, and replaces it. It has accepted uses in some nerve, blood and kidney diseases. It is not approved anywhere for ageing, for lowering biological age or for Alzheimer disease. | 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. |
| Half-life | Not reported | Not reported |
| Molecular weight | Not reported | Not reported |
| How it works | Two rival explanations, neither settled in people. The thinning idea, worked out in mice, says that taking out some old plasma waters down proteins that build up with age and resets the body's signals, and that what you put back barely matters. Mouse work in 2020 found that salt water plus albumin matched the effect of young blood. The replacement idea says the albumin itself is what counts. It may bind and carry away unwanted molecules, or restore the blood's carrying capacity. That is the thinking behind the AMBAR method, where albumin is the replacement fluid. The 2025 Scientific Reports trial took plasma out without putting albumin back, and the ageing clocks moved the wrong way. That is evidence against thinning being enough on its own, though one small trial does not settle it. | 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. |
| Studies in people | 7 | 2 |
| Evidence | Moderate: 5 completed trials, 389 people given it | Limited: 2 completed trials, 42 people given it |
| Legal status, US | Approved medical procedure; not approved for ageing uses | Investigational, not approved |
Frequently asked questions
What is the difference between Therapeutic Plasma Exchange and Plasma Dilution?
Therapeutic Plasma Exchange: A standard hospital procedure that takes out plasma and puts a blood protein called albumin back. A 347-person trial in Alzheimer disease hit one of its two main goals. Two small 2025 trials of ageing markers came to opposite conclusions. 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.
Which has stronger research evidence, Therapeutic Plasma Exchange or Plasma Dilution?
Each compound gets a band worked out from facts we counted, with the math shown. Therapeutic Plasma Exchange is Moderate (5 completed trials, 389 people given it). Plasma Dilution is Limited (2 completed trials, 42 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Therapeutic Plasma Exchange and Plasma Dilution FDA-approved?
Therapeutic Plasma Exchange: Therapeutic plasma exchange is an established medical procedure. A machine cleared for the job removes plasma, the liquid part of blood, and replaces it. It has accepted uses in some nerve, blood and kidney diseases. It is not approved anywhere for ageing, for lowering biological age or for Alzheimer disease.. Plasma Dilution: 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..
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.