Hair Exosomes: How They Act on the Follicle

How do exosomes act on hair? They're tiny vesicles, a kind of messenger your cells send one another to communicate. In hair treatment, we place them in the scalp so they carry a regeneration signal to the follicle.

You've heard of them, but the word stays vague, and it's hard to judge a treatment you don't understand. This article explains what is known about the mechanism, without guaranteeing a result. Exosomes are not approved by Health Canada for hair regrowth, even though their use is common in clinics.

What an exosome is

The definition

An exosome is a vesicle, meaning a tiny biological sac, measuring between 30 and 150 nanometres. That's about a thousand times smaller than the thickness of a hair.

Every cell in the body produces them naturally. It's how cells communicate, a bit like letters they send each other to exchange information.

What an exosome contains:

• growth factors, which give the order to regenerate;
• repair proteins, which serve as rebuilding tools;
• messenger RNA, which carries the instructions;
• nourishing lipids, which serve as nutrients for the cell.

The ones used in aesthetic medicine

For hair treatments, exosomes come from controlled cell cultures in a laboratory, most often of plant origin. Permitted sources vary from one country to another. You're welcome to ask where the product comes from at your consultation.

We use these sources because their cells produce exosomes in consistent quantity and quality, rich in growth factors useful to the follicle.

How they act on your hair

You can think of exosomes as small messengers asking the hair bulb to start growing again. It happens in three steps.

1. Placement

Exosomes are placed directly in the scalp, through micro-injections with a very fine needle or through microneedling, depending on the protocol.

Why we go that way:

• targeting is precise, since they arrive at follicle depth;
• nothing is lost on the way, unlike a surface application;
• action starts immediately, within minutes.

2. Fusion with the cell

Once placed, exosomes fuse with the membrane of your follicular cells, a bit like a letter slipped under a door.

The message they pass on to the cell:

• wake the dormant stem cells;
• repair the accumulated damage;
• increase keratin production;
• improve local circulation.

3. The cell's response

Dormant follicles reactivate. Follicles in the resting phase (telogen) get the signal to return to the growth phase (anagen).

Weakened follicles get stronger. Follicles that have shrunk over time can regain calibre.

The environment around the follicle improves, with less local inflammation, better microcirculation and a stronger follicular matrix.

The mechanisms in detail

Action on the hair cycle

A longer growth phase. Exosomes encourage the hair to stay in the anagen phase longer, which means longer, stronger hair.

A shorter resting phase. They reduce time spent in the telogen phase, and turnover speeds up.

A cleaner transition. The shift between growth and rest, the catagen phase, happens more smoothly, and fewer hairs fall too early.

Communication between cells

In the scalp, cells exchange messages constantly. The follicle signals to the dermal papilla that it needs more nutrients to grow, and the papilla asks the blood vessels to increase blood supply to the area.

At the same time, stem cells get the signal to multiply faster to produce more keratin, and fibroblasts the signal to strengthen the collagen that supports the follicle.

Lowering inflammation

Chronic scalp inflammation is one of the causes of hair loss. It weakens the follicle little by little, without anyone noticing.

What exosomes bring to it:

• soothing cytokines, which calm local irritation;
• repair factors, which restore damaged tissue;
• immune modulators, which rebalance the inflammatory response.

How they differ from other treatments

Exosomes and PRP, two complementary approaches

The two combine well, and that's the basis of our DC Bloom Exo and DC Prime Exo programs.

Exosomes and minoxidil, opposite logics

Minoxidil dilates blood vessels at the surface and treats the symptom. When you stop, shedding returns.

Exosomes act on the follicle itself and its environment, not just on the shedding you can see. Their effects hold with maintenance.

That's why we don't point anyone toward minoxidil here. We'd rather bet early on your own follicles than on a product you apply every day, for life.

Exosomes and transplant, two treatments that complement each other

A hair transplant addresses completely bare areas. It redistributes existing hair and gives an immediate result, but a fixed one.

Exosomes improve the overall quality of the hair. They act on the follicles still present and slow the loss to come.

Do you have completely bare areas? Then a transplant is the right answer, and we'll tell you so.

What you can expect

The markers below describe a typical progression. Response varies from person to person, and nobody can guarantee you a result.

Around 1 month. Daily shedding drops, and hair becomes shinier and more resilient. Texture improves too.

Around 3 months. Regrowth appears in thinning areas, fine hair thickens and the roots gain density.

Around 6 months. The change shows across the whole head of hair. Hair is fuller, and thinning areas fill in.

Around 12 months and beyond. Results settle and the hair cycle is rebalanced, which slows further loss.

The types of loss concerned

Androgenetic alopecia. Miniaturization slows, the follicles still present wake up and overall density increases.

Diffuse loss in women. Fragile hair gets stronger and overall volume returns. In women, we first check iron, thyroid and hormones, because a follicle restarted without correcting the cause keeps fighting against it.

Telogen effluvium. Recovery is faster and the shedding phase shorter.

Alopecia areata. This is an autoimmune condition, followed in dermatology. We don't treat it here, and we'll refer you.

Who it is for

The right profile

• Recent or moderate loss
• Follicles still present, but weakened
• A wish for something that works with your biology
• A contraindication to PRP

When exosomes have the edge

1. When plasma quality would be lower. That's the case with smoking, chronic stress, disrupted sleep or an unbalanced diet.

2. When your health rules out PRP. For example poorly controlled diabetes, anticoagulants or certain chronic conditions.

3. When you want to avoid the blood draw. Some people simply don't want one, and that's reason enough.

When to prefer exosomes over PRP

Your lifestyle and health directly influence the quality of your PRP. Exosomes always arrive at the same concentration, and it generally exceeds what a standard PRP delivers.

There are practical reasons too. No blood draw, a shorter session and fewer variables to control.

The protocol

How a session goes

1. Preparation, about 10 minutes. We clean the scalp, apply numbing cream if needed and prepare the exosomes.

2. Placement, 15 to 20 minutes. We make precise micro-injections in the targeted areas, at follicle depth. With a very fine needle, discomfort stays mild.

3. After, 5 minutes. A gentle massage spreads the product. We then give you the aftercare instructions and the date of the next session.

The full protocol

The starter phase, with our DC-Exo program. A series of sessions a few weeks apart, with follow-up on the first signs and no blood draw.

The maintenance phase. One to two sessions a year as needed, to hold what has been gained. We adjust it as things evolve.

What helps the result

Your habits. A diet rich in protein and vitamins, sleep, and less stress where possible. Treat your scalp gently too.

Complementary treatments:

• PRP in combination;
• microneedling with exosomes on the face, depending on the concern;
• suitable topical care.

Questions we get asked

Are there risks or side effects?

There's no risk of rejection, the product is prepared under sterile conditions, and side effects are mild and brief.

What you might feel:

• light redness, 2 to 4 hours;
• a sensitive scalp for a day;
• rarely, a small bruise at an injection point.

The approach is recent, and there's no very long-term hindsight yet.

How long do results last?

The signal placed keeps acting well after the session, but no hair treatment stops aging. We see a benefit that holds as long as you keep up maintenance, and fades when you stop entirely.

The duration varies with your lifestyle and with how closely you follow the maintenance protocol. Your genetics play a part too, and nobody can change them.

Can it be combined with other treatments?

• With PRP, yes. It's the most frequent combination, and the basis of our Exo programs.
• With a transplant, yes. Exosomes care for the scalp around the grafts.
• With laser, it depends on the state of the scalp. We discuss it at the assessment.

What's coming

The field is young and moving fast. Current research looks at:

• compositions tailored to each person's profile;
• new sources of exosomes;
• new ways to deliver them, from automated microneedling to slow-release devices.

We follow these avenues closely, without announcing them before they become treatments.

In short

Exosomes send a signal straight to the follicle, without a blood draw. They don't replace lost hair, and the signal only works if the follicle is still there to receive it.

That's what we look at during the assessment, and why we tell you early whether you're at the right moment or not.

To start, see our hair page, which explains which program matches which situation.