It's an anti-hair loss tonic. It helps control hair fall, helps strengthen and nourish the hair root and follicle, helps hair look fuller, and helps keep the scalp clean and comfortable.

That's the everyday part of hair care — and it's most of what's genuinely within your control. Ten seconds a night, on a scalp that's being looked after rather than ignored.

Two things, both of which you can check for yourself in the ingredient list above.

The first is Palmitoyl Tetrapeptide-20 Amide — a synthesised peptide, the sort of active you'd normally find in a face serum rather than a scalp tonic. It sits sixth in the list, ahead of most of the botanicals, and it's the most considered thing in the formula.

The second is Piroctone Olamine, a well-established anti-dandruff ingredient. Including it in a leave-in tonic is unusual, and it's why this helps with scalp comfort as well as the hair itself.

We publish the full formula because we're happy for you to compare it to anything else on the shelf.

Because it's a leave-in, and leave-ins work best when they're actually left in. Applied before bed, it has uninterrupted hours on your scalp — nothing rinsing it off, brushing it out, or sitting on top of it.

It also makes the habit far easier to keep. A step that attaches to something you already do every night is one you'll still be doing in six months, which matters more than any single application.

Around three to four weeks for most people, though it varies more than you'd think. If you have short hair and a small area to cover, a bottle can stretch past a month. Longer or thicker hair, or a wider area, and you'll go through it in about three weeks.

That's why the programmes are sold as bottles rather than months — three bottles is three bottles, however long each one lasts you.

Cool. There's menthol in the formula, so you'll feel a distinct cooling sensation for a minute or two after you massage it in — most people find it pleasant, and it's a useful signal that you've covered the whole scalp.

It contains alcohol, which is what carries the actives into the scalp and helps it dry quickly rather than sitting wet on your head. If your scalp is on the sensitive side, patch test on your inner forearm first.

Give it three months, and be sceptical of anyone who tells you less. Hair grows roughly a centimetre a month, and any change to a scalp routine takes a full cycle before there's anything meaningful to assess.

The scalp comfort side you'll notice much sooner — usually within a few weeks.

It contains wheat germ extract, soybean germ extract and fragrance. The complete formula is published above — worth a read before you order if you have a known allergy.