Exosomes for the skin: what they can and cannot do

Exosomes are microscopic particles released by cells that carry proteins and genetic signals to other cells. Exosomes from mesenchymal stem cells carry signals that reduce inflammation and support repair, which is why they are being studied for skin and hair. They are promising, but most of the evidence comes from laboratory studies and small clinical studies.

How might exosomes help the skin?

Much of the benefit of stem cells seems to come from what they release rather than from the cells themselves. Exosomes are part of that release. In laboratory and animal work they reduce inflammation, support new blood vessels and encourage the cells that build collagen. Using exosomes instead of whole cells avoids transplanting living cells.

What did the psoriasis study find?

A 2024 clinical study co-authored by Professor Nilforoushzadeh gave 12 patients with mild to moderate plaque psoriasis a single dose of exosomes taken from fat-derived stem cells, at one of three dose levels.

• At the 200 μg dose, redness and hardness of the plaques decreased significantly; scaling did not.
• Plaque thickness decreased significantly at the 100 and 200 μg doses.
• Skin samples showed fewer inflammatory markers (IL-17 and CD3 cells) and more of a marker of regulatory immune cells (FOXP3).

The authors conclude that 200 μg looked best, but that a larger group of patients is needed for reliable results, and that higher or repeated doses should be tested.

What else are they being studied for?

• Hair loss: case reports in alopecia areata and lichen planopilaris; see exosomes for hair loss.
• Wounds and burns: mostly laboratory and animal studies; see stem cells and exosomes in wound healing.

What are the limits?

Studies so far are small, use different preparations and doses, and follow patients for a short time. Products sold as "exosomes" also vary: how they are made, from which cells, and how they are tested matters. In the United States, no exosome product is approved by the FDA to treat any condition, and the agency has warned about unapproved products. Exosome treatment is something to discuss with a dermatologist as part of research-based care, not an established treatment. For how it compares with other options, see the regenerative dermatology guide.