Exosomes: Science Versus Marketing Promises

Exosomes: How Cells Exchange Information and What Science Knows Today

When we talk about communication in the body, we usually think of nerve signals and hormones. But cells also use another way to send each other information: they release tiny membrane-wrapped particles that can carry proteins, lipids and RNA.

These particles belong to the group of extracellular vesicles, and exosomes are one type within it. The word “exosomes” is often used for all such particles, but scientists prefer the more general term when their exact origin has not been proven. This distinction matters: two samples labelled “exosomes” do not always contain the same particles.

What do they carry?

Imagine an extracellular vesicle as a small parcel. Its membrane protects the contents, and the molecules on its surface take part in interactions with other cells. Inside there may be proteins, lipids and various types of RNA.

The contents depend on the cell that released the particle and on its condition. That is why researchers are interested in two questions: what these particles can tell us about processes in the body and whether one day they could be used to deliver substances to specific tissues. The answers still depend on the specific application.

Why are they interesting for medicine?

Extracellular vesicles take part in signalling between immune cells, tissues and organs. They are being studied in connection with inflammation, metabolism, recovery and the development of disease. This is an active field of science, but the fact that they take part in a process does not mean we can already safely control it with a ready-made product.

Diagnostics is one of the promising directions. Because vesicles can carry molecules from the cell that produced them, scientists are investigating whether a blood or urine sample could provide additional information about a tumour or the response to treatment. Every diagnostic test, however, must be evaluated separately – according to its purpose and the evidence behind it.

Tissue repair is another area of research. Vesicles from various cell sources are being studied as possible therapeutic agents. Early results justify new clinical trials, but they do not prove that the injections, infusions or supplements offered today have the same effect in humans.

What do movement and food have to do with it?

Physical exercise changes the extracellular vesicles circulating in the blood – this has been observed in human studies too. Scientists are investigating whether these particles carry some of the signals through which active muscles influence other tissues. The practical takeaway remains familiar: regular movement is beneficial, and we do not need to measure exosomes to recommend it.

Plants also contain particles similar to extracellular vesicles. Experiments with particles extracted from ginger show interesting effects on intestinal cells and in animal models of inflammation. This does not prove that a serving of ginger or a product with “plant exosomes” will achieve the same results in humans. A varied diet of whole foods has plenty of reasons to be part of a healthy lifestyle without attributing an unproven “exosome” effect to it.

Where does science meet marketing?

Today, exosome products are advertised for “rejuvenation”, sports recovery, hair, skin and joints. With such an offer, the key questions are specific: what cells do the particles come from, how were they produced and tested, how are they administered, and what clinical results does this exact product have for this exact purpose?

According to the published position of the US Food and Drug Administration (FDA), there is no exosome product approved by the agency for therapeutic use. The FDA also warns about the risks when unapproved products are offered as treatment. This is information about the regulatory status in the US – the rules in other countries need to be checked separately.

A beautiful biological idea is not the same as a proven result in humans. For a therapy to exist, it needs a clear composition, quality control, appropriate clinical trials and safety monitoring.

Agaia's position

Exosomes open a new window onto the way cells interact with each other. They may help science better understand metabolism, inflammation and recovery. For now, the most sensible approach is to follow the development of diagnostics and clinical trials without turning a promising mechanism into a promise of a ready-made therapy.

For everyday care, the foundation remains clear: movement, enough sleep and a diet tailored to a person's needs and tolerance. Exosomes add an interesting new layer to our understanding of these processes – but they do not replace evidence when we choose a specific intervention.