The Quiet Upside of Donating Plasma: What a Landmark Study Suggests About "Forever Chemicals"

Donating plasma may do something measurable for the donor's own body — not just for the patients downstream.

Most people think of plasma donation as a purely generous act — and it is. But a growing body of research hints at something many donors don't realize: donating plasma may also do something measurable for the donor's own body.

Every donation helps manufacture therapies that patients with immune deficiencies, bleeding disorders, and other serious conditions depend on. A rigorous clinical trial published in JAMA Network Open adds an intriguing second dimension. It looked at "forever chemicals" — and found that giving plasma reduced their levels in the blood more effectively than giving whole blood.

First, what are "forever chemicals"?

Per- and polyfluoroalkyl substances, better known as PFAS, are synthetic compounds used for decades in non-stick cookware, water- and stain-resistant fabrics, certain paints, and firefighting foams. They resist heat and repel water and oil — and those same properties make them extraordinarily persistent. They don't break down easily in the environment, and they accumulate in the human body, where compounds like PFOS can linger for years.

PFAS are now detectable in the blood of nearly everyone. Health agencies around the world have linked higher exposures to a range of possible health concerns. Until recently, there was no established way to actively lower the levels already circulating in a person's blood.

The study: plasma vs. blood vs. doing nothing

Researchers in Australia ran a randomized clinical trial — the gold standard of clinical evidence — in 285 firefighters, a group with historically high PFAS exposure from firefighting foams. Everyone had elevated baseline levels. Participants were randomly assigned for 12 months to one of three groups:

• Donate plasma every 6 weeks

• Donate whole blood every 12 weeks

• Observation only — no donation

At the end of a year, the differences were striking.

Plasma donation cut PFOS by roughly three times as much as whole blood donation.

Plasma donation produced the largest reductions of all three measurable PFAS compounds. For PFOS — the most abundant — plasma donation cut levels by about 2.9 ng/mL, roughly three times the reduction seen with whole blood donation (about 1.1 ng/mL). Plasma donation also meaningfully lowered PFHxS and PFOA, while whole blood donation and observation did not. In the observation group, levels essentially held flat or drifted slightly upward.

Both donation methods beat doing nothing. But plasma donation was clearly the standout.

Why would plasma work better than blood?

This is where the biology gets interesting — and where it connects to something we know well in medicine. PFAS don't float freely in the blood; they bind tightly to proteins, and those proteins live in the plasma, the liquid portion of blood. So when you remove plasma, you're removing the exact compartment where these chemicals are concentrated.

The core principle: removing plasma removes what the plasma carries.

There are a few likely reasons plasma donation outperformed whole blood:

• Plasma can be donated more often. Because red cells are returned to the donor, plasma can be given far more frequently than whole blood — more chances to clear these protein-bound compounds over time.

• The plasma compartment is where PFAS live. Removing plasma targets the relevant fraction directly, rather than removing red cells, iron, and oxygen-carrying capacity the body then has to rebuild.

• In other words, plasma donation may act as a more targeted removal pathway.

The connection to therapeutic apheresis

For clinicians, none of this is entirely new in principle. Therapeutic plasma exchange (apheresis) is a well-established medical procedure used to remove harmful substances from the bloodstream — things like disease-causing antibodies and certain protein-bound toxins — in conditions ranging from autoimmune neurological disease to poisonings. It works on exactly the logic this study illustrates: if a harmful agent travels in the plasma, removing and replacing plasma can lower its burden.

Routine plasma donation is a gentler, lower-volume relative of that same idea. This PFAS study is a real-world demonstration of the underlying principle.

"The core idea in one line: removing plasma removes what the plasma carries."

Important context — what this does NOT prove

We think it's worth being clear-eyed here, because credibility matters more than hype.

• This trial measured a reduction in blood levels of PFAS. It did not demonstrate that lowering those levels changes long-term health outcomes — a separate question that still needs study.

• It was conducted in firefighters with elevated exposure. How much the same effect applies to the general population is still being worked out.

• The idea that plasma donation might also help clear other substances — heavy metals, microplastics, and the like — is a reasonable hypothesis based on the same removal logic, but it has not been established. We'd treat that as an open scientific question, not a claim.

None of that diminishes what the study found. It simply keeps the finding where it belongs: a genuine, well-conducted result, with more research still to come.

The takeaway

Donating plasma has always been about helping others — the patients downstream who rely on plasma-derived medicines. What studies like this one add is an intriguing second dimension: the act of donating may, in measurable ways, also do something beneficial for the donor.

At CRT Plasma, we find this line of research exciting, and we'll continue to follow it closely. As always, plasma donation should be done under proper medical supervision, and it remains, first and foremost, one of the most meaningful gifts a person can give.

Reference: Gasiorowski R, Forbes MK, Silver G, et al. Effect of Plasma and Blood Donations on Levels of Perfluoroalkyl and Polyfluoroalkyl Substances in Firefighters in Australia: A Randomized Clinical Trial. JAMA Network Open. 2022;5(4):e226257. doi:10.1001/jamanetworkopen.2022.6257

This article is for general educational purposes and does not constitute medical advice or a promise of any specific health benefit from plasma donation. If you have questions about your own health or environmental exposures, please consult a licensed healthcare provider.