What it means
Exosomes are extracellular vesicles 30–150 nanometres across that cells release to communicate: they carry proteins, lipids, messenger RNA and microRNA from one cell to another. Their cargo depends on the cell that made them, which is why stem-cell exosomes are studied as a way of getting the signalling benefit of stem cells without the cells.
Clinics offer "exosome therapy" as injections, IV infusions, or topical application after microneedling, usually derived from donor placental or umbilical tissue, sometimes from plant cells.
Why it matters for longevity
If stem cells help repair tissue mainly through what they secrete, a standardised exosome product could be cheaper, safer and easier to make than cell therapy. That hypothesis is being tested properly in trials for lung, heart and skin conditions. In the meantime the marketed products are unapproved biologics with unknown cargo, which regulators in the US and EU have repeatedly warned about.
What the evidence says
Animal studies show stem-cell exosomes improve wound healing, cardiac repair after infarction and neurological recovery in rodents. Early human trials: a 2020 study of exosome inhalation in COVID pneumonia (24 patients, no control); small trials in hair loss and skin after microneedling with mixed results.
No exosome product is approved for any use in the US, EU or UK. The FDA has issued warnings after serious infections from contaminated products, and independent testing of commercial "exosome" products has found wide variation in vesicle count, contamination, and in some cases no exosomes at all. No controlled trial supports any anti-ageing, joint or systemic use.
How to measure or use it
- There is nothing to measure; the products are not standardised and the outcomes claimed are not tested.
- Questions for any clinic: the source tissue, the manufacturer, the regulatory status, the vesicle count and purity certificate, and the published trial for the proposed use.
- For the use cases exosomes are sold for — skin, joints, recovery — the evidenced options are photobiomodulation, PRP for some joint indications, and the training and sleep levers.
Related
- Exosomes (therapy page) — the full grading, and the questions to bring to a clinic
- Stem-cell therapy — the parent idea
- PRP and regenerative injections — the evidenced alternative for joints
Frequently asked questions
Are exosome treatments approved?
No. No exosome product is licensed for any use in the US, EU or UK; they are sold outside the approval system.
Do exosomes work for skin or hair?
Small, mixed trials after microneedling. Nothing controlled for ageing, joints or systemic use.
What is the risk?
Contamination and infection from unregulated biological products, as in FDA-documented cases, plus unknown cargo. Any benefit is unproven; the harm has been documented.
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