Watch the brush actually work.

There is one thing a shop page cannot do, however many photographs it carries: show you the thing moving. You cannot tell from a still image how a brush parts hair, how thin the serum is, or how long a row of lines across a scalp really takes.

That is what the TikTok is for. It is the same 100ml bottle sold here, filmed on a phone, in ordinary light.

What you will find there

• The applicator being used, at close range and in real time.
• The texture of the serum, and how quickly it disappears.
• The bottle itself — the cap, the bristles, the seal — so you know what arrives.

What you will not find there

No before-and-after regrowth footage. Not because we could not stage it — that kind of video is easy to make and half this category runs on it — but because a cosmetic serum is not a medicine and we are not going to imply otherwise. What is sold here is a way of getting the liquid onto your scalp instead of onto your hands. That is a claim you can check by holding the bottle.