E5 Plasma Fraction dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
E5 Plasma Fraction is a cleaned-up part of the blood plasma of young pigs, given to old rats. It more than halved the tissue age of their blood, heart and liver. No person has ever received it.
Evidence grade for E5 Plasma Fraction: Animal or lab only. The rule: only animal or lab studies on this page. No study in people yet. The sum on this page: 4 animal studies, no human study. 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.
4 animal studies, no human study
4 effects reported, 4 unwanted, by people using it, not a trial
Goal pages: Fat loss and metabolism, Brain, memory and mood, Injury, healing and recovery, Immune system and inflammation, Gut health
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 is a cleaned up part of the blood plasma of young pigs. It was given to old rats. No person has ever received it.
What people take it for
- Reversing ageing, off that one rat paper.
- Younger readings on tissue age tests.
What studies in people showed
No person has received this. There is no registered trial and no published safety data in people of any kind. In rats, one paper reported the tissue age of blood, heart and liver more than halved. A brain control centre moved less but still moved. The team says blood tests, body function, behaviour and memory all improved. That is one paper, one lab, one species, and nobody has repeated it. The team did build and check the rat clocks first, which is more care than most animal ageing work takes.
What people report
Reports, not study results
The good
- We have not collected user reports on this one yet.
The bad
- It is a blood product from another species. Nobody has looked at whether the immune system would attack it.
- Nobody has looked at whether pig viruses hidden in the genome could come along.
- Nobody has named the active ingredient, so there is nothing to dose or make to a standard.
- A mouse study found that simply thinning old plasma matched young blood. That may be what is really happening here.
Where these come from: The rat numbers and the thinning comparison come from the studies on this page. No user reports exist.
My bottom line
One rat paper from one lab, and a pig blood product nobody has given to a person. Not close to ready.
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. The record on this one is set out below.
- Memory and thinking2 animal or lab studies
- Inflammation1 animal or lab study
- Losing fat specifically1 animal or lab study
33 of the 36 indexed goals have no study of any kind behind E5 Plasma Fraction
No study in people, animals or cells on this page reports a result for these. That does not prove E5 Plasma Fraction does nothing for them. It does mean anything you have heard about E5 Plasma Fraction and one of these did not come from a study cited here.
Show full evidence
What is E5 Plasma Fraction?
E5 Plasma Fraction is a cleaned-up part of the blood plasma of young pigs, given to old rats. It more than halved the tissue age of their blood, heart and liver. No person has ever received it.
No person has received E5. There is no registered trial in people of a pig plasma fraction for ageing. A blood product from another species raises specific questions, including whether the immune system attacks it and whether pig viruses hidden in the genome could come along. A rat study is not built to answer either.
E5 is a cleaned-up part of the blood plasma of young adult pigs. The single study behind it was published in GeroScience in 2024. The team first built and checked six tissue-age clocks for rat tissue, using 613 tissue samples. Two of those clocks work in both human and rat tissue. Then they used the clocks to see what the pig plasma fraction did to old rats.
The reported result is large. Treatment more than halved the tissue age of blood, heart and liver, with a smaller but real effect in the hypothalamus, a control centre in the brain. The authors say this came with steady improvement in how those organs worked, across blood tests, body function and behaviour, including memory tests. They also report a shift in the sugar coating of an antibody, from a pattern linked to more inflammation to one linked to less. The work had US National Institutes of Health support plus other funding.
How does E5 Plasma Fraction work?
Not worked out, in any species. The paper measures outcomes, mainly tissue-age clock readings and organ function markers. It does not say which part of the fraction does what. Nobody has named the active ingredient. That is the usual position for whole plasma and plasma fractions. It is also why the serious drug work in this field is on single named factors like TIMP2, platelet factor 4 and Gpld1, rather than on mixtures.
What have studies in people found about E5 Plasma Fraction?
None. No person has received E5 or any young pig plasma fraction. There is no registered trial in people, and no published safety, dosing or marker data of any kind in people.
What this does not tell you: A rat result this big is worth reporting, and it tells you nothing about a person. On top of the usual gap between species, this is a blood product from another animal. That raises questions about the immune system attacking it and about pig viruses crossing over, and no published work has looked at either. The active ingredient has never been named, so there is nothing to describe, dose or make to a standard. The main thing measured is a tissue-age clock, which is a marker that tends to track with health rather than health itself. The paper also reports the organs working better, which is a stronger claim. All of it is in rats.
The state of the research
One paper, one lab, one species, and nobody has repeated it. That is the whole record. It is said plainly here because the headline number, more than halving the tissue age of three organs, is the kind of figure that travels a long way from where it started. The paper is well built on its own terms. The team made and checked the rat clocks first, which is more care than most animal ageing work takes. And they report how well the organs worked, not just the clock readings.
The comparison that matters is the mouse plasma thinning work published in Aging in 2020. Swapping out half the plasma for salt water plus albumin, adding nothing young at all, matched the effects people credit to young blood. If that is right, a young plasma fraction may work by removing old plasma rather than by adding anything. No experiment has been run that tells those two apart for E5 itself.
No company programme for this product is on the US trial registry. When a research write-up or a news story describes a human programme, the registry is the place to check, and the registry is empty.
The evidence, in charts
Fig. 1a · how many people
0people have taken this in any study cited here
0 people · 0 studies in people
What this page cites instead is 4 animal studies. None of them gave the compound to a person.
Counted from the list of sources on this page. We draw this chart only when a study in people is cited. An empty one is the answer, not a gap in the page.
Fig. 1b · evidence mix
None of the 4 sources here are studies in people.
- Animal study · done in animals4100%
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 4 different years, 2011 to 2024, 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 E5 Plasma Fraction, which is expected: a procedure is not built from amino acids.
The studies we cite
- Animal study2024Reversal of biological age in multiple rat organs by young porcine plasma fraction
In rats, a fraction of young pig plasma made old organs look much younger on paper. The team first built and checked six tissue-age clocks for rat tissue, from 613 samples. Two of those also work in human tissue. After treatment, the tissue age of blood, heart and liver more than halved. A control centre in the brain moved less but still moved. Blood tests, body function, behaviour and memory all improved. Funded by the US National Institutes of Health with other support.
Rat. Six epigenetic clocks were developed and validated for rat tissues from 613 tissue samples, with two clocks trained on an additional 1,366 human tissue samples to work across both species. A young porcine plasma fraction treatment more than halved the epigenetic ages of blood, heart and liver tissue in old rats, with a smaller but statistically significant effect in hypothalamus, accompanied by improvements in biochemical, physiological, behavioural and cognitive measures and a shift in immunoglobulin G N-glycosylation from pro- to anti-inflammatory. NIH supported with non-US government funding.
- Animal study2011The ageing systemic milieu negatively regulates neurogenesis and cognitive function
In mice, this is the experiment that started the young blood field. Researchers joined the blood supplies of a young mouse and an old mouse. Something carried in blood can slow or speed up the growth of new brain cells, depending on age. Plasma from old mice made a young mouse's brain adapt less well and made it worse at learning and at remembering where something bad had happened.
Mouse. The heterochronic parabiosis experiment that established that blood-borne factors can inhibit or promote adult neurogenesis in an age-dependent way, and that plasma from old mice impairs synaptic plasticity, contextual fear conditioning and spatial learning in young mice.
- Animal study2020Rejuvenation of three germ layers tissues by exchanging old blood plasma with saline-albumin
In mice, and this is the key comparison for this page. Half the plasma was swapped for salt water with 5 percent albumin, with no young plasma added at all. It matched or beat young blood on muscle repair, on fat and scarring in the liver, and on new brain cell growth. If simply thinning the blood does the same job, it gets much harder to argue that young plasma contains some special rejuvenating ingredient.
Mouse, and the most important comparison for this page. A single exchange of half the plasma volume for saline containing 5 percent albumin, with no young plasma added at all, met or exceeded the effects of young blood on muscle repair, liver adiposity and fibrosis, and hippocampal neurogenesis. If dilution alone can reproduce the effect, the case that a young plasma fraction contains a specific rejuvenating agent becomes harder to make.
- Animal study2017Human umbilical cord plasma proteins revitalize hippocampal function in aged mice
In mice, plasma from human umbilical cords improved how the memory centre of the brain worked and how well old mice did on memory tests. One protein, TIMP2, turned out to be needed for that benefit. This is the other way to do this research: find the single molecule instead of dosing a whole mixture.
Mouse. Human umbilical cord plasma improved hippocampal function and cognition in aged mice, and TIMP2 was identified as a specific blood-borne factor necessary for that benefit. This is the alternative research strategy to whole-fraction dosing: find the molecule.
Common questions
Has E5 Plasma Fraction been tested in people?
Not in any study cited here. E5 Plasma Fraction is a cleaned-up part of the blood plasma of young pigs, given to old rats. It more than halved the tissue age of their blood, heart and liver. No person has ever received it.
What is the E5 Plasma Fraction dosage?
No human dose established. No published study on this page has given this compound to people and reported a result. 4 animal studies, no human study
Is E5 Plasma Fraction FDA-approved?
Not approved anywhere. ClinicalTrials.gov lists no human study of a plasma extract from pigs for any ageing use. This is a research product only.
Has E5 been given to a human?
No. There is no published study in people and no registered trial of a pig plasma fraction for ageing. Everything known about it comes from one paper in old rats.
What did it do in rats?
It more than halved the tissue age of blood, heart and liver, and had a smaller but real effect in the hypothalamus, a control centre in the brain. The authors report the organs working better across blood tests, body function, behaviour and memory, plus a shift in an antibody's sugar coating toward a pattern linked to less inflammation. One paper, one lab, and nobody has repeated it.
Is a pig plasma product safe to give a person?
Nobody knows, because nobody has published doing it. A blood product from another species raises questions about the immune system attacking it and about pig viruses crossing over, and a rat study does not address either. The active part of E5 has never been named.