How Your Hair Actually Grows: The Follicle Cycle, Explained

Nearly every product, myth, and frustration around hair loss traces back to one thing: the hair growth cycle. Understand it, and everything else makes sense.

Hair doesn’t grow continuously. Each of the roughly 100,000 follicles on your scalp runs its own independent cycle — growing, resting, shedding, and starting over. Here’s how it works, and why it matters for anything you put on your scalp.

The three phases of the hair cycle

Anagen — the growth phase. The follicle actively produces a hair, pushing it up from the root. Anagen lasts 2 to 6 years, which is why some people grow their hair much longer than others. At any moment, around 85–90% of your hairs are here.

Catagen — the transition phase. A brief window (about 2–3 weeks) when growth stops and the follicle shrinks and detaches from its blood supply. Only about 1% of hairs are in this phase at once.

Telogen — the resting & shedding phase. The follicle rests for around 3 months, then releases the old hair — the normal shedding you see in the shower — before starting a new cycle. Losing 50–100 hairs a day is completely normal.

So what is “thinning,” really?

Healthy hair loss is balanced: hairs shed, and new ones of the same thickness replace them. Thinning happens when that balance tips. Two things go wrong: the anagen phase shortens, so hairs spend less time growing, and the follicle miniaturizes — producing a thinner, weaker hair each cycle until it may stop producing a visible hair at all.

A miniaturized follicle is usually still alive — dormant, not gone. That’s the opportunity.

Reactivated early, a dormant follicle can return to producing thicker, healthier hair. That’s the entire premise behind modern approaches to hair restoration.

Why the root is where it counts

Everything above happens at the follicle, several millimetres below the surface of your scalp — not on the strands you can see. This is why so many products disappoint: a shampoo rinses away in seconds, and a serum that sits on the surface struggles to reach the depth where growth actually happens. If you want to influence the cycle, you have to reach the follicle — the idea behind micro-infusion.

Sources: General hair-biology reviews; Lademann et al., 2006; Dhurat et al., 2013. [Añade enlaces]

This article is for general educational purposes and is not medical advice. Individual results vary. If you’re concerned about hair loss, consult a licensed dermatologist. Velora is a drug-free cosmetic system and is not intended to diagnose, treat, cure, or prevent any disease.