If I had a pound for every time someone at the basin asked me the difference between Shampoo One and Shampoo Two, I could retire to Flamborough Head. They sit side by side on our shelves, the bottles look nearly identical, and the names give nothing away. So let me settle it properly — the same way I would if you were sat in my chair in Bridlington.
The short answer
Both are originals from the very first Paul Mitchell line, going back to 1980, and both are built for daily washing. The difference is simple: Paul Mitchell Shampoo One is the gentler cleanse, made for fine to medium hair. Paul Mitchell Shampoo Two digs deeper, made for medium to thick hair, oilier roots and people who train, sweat or style hard.
If you're between the two, ask yourself one question: by teatime, does your scalp feel fine, or does it feel like it needs another wash? Fine means One. Needs another wash means Two.
Shampoo One: the gentle daily wash
Shampoo One is the shampoo I reach for most on the salon floor. It's designed for fine to medium hair that wants cleansing every day without protein build-up — it lifts away residue and leaves hair light and bouncy rather than squeaky and stripped. Inside you'll find awapuhi extract (the signature Paul Mitchell ingredient), henna for body and chamomile to soften.
Because it's the gentler of the pair, it's my pick for anyone whose hair sulks after a harsh wash — fine hair goes flat and coloured hair fades faster when you scrub it with something stronger than it needs. Sizes run from a 75ml travel bottle at £8.45 up to the full salon litre at £37.95.
Shampoo Two: the deeper daily clean
Shampoo Two is the second of the original line and it's the workhorse. Same daily-wash philosophy, but a deeper-cleaning formula aimed at medium to thick hair, oily scalps and active lifestyles. Awapuhi again, plus marigold for shine and sage to clarify.
This is the one I recommend to the gym-goers, the swimmers-who-shower-twice, the farmers and the fishermen round here — anyone whose roots look flat and greasy by the end of the day. It gives a more thorough cleanse than One without being a harsh reset. The 300ml is £16.45, same as One, and the litre is £37.95 too, so price won't decide it for you — your scalp will.
How to choose between them
Here's my honest salon-floor test, no lab coat required:
- Fine or medium hair, washes daily, hates feeling stripped: Shampoo One.
- Medium to thick hair, oily roots by evening, exercises most days: Shampoo Two.
- Genuinely between the two: start with One. You can always step up; it's harder to undo an over-cleanse. The 75ml sizes are a cheap way to trial both.
Whichever you pick, the technique matters as much as the bottle. Wet the hair properly, use a 10p-sized amount, and massage the scalp for a full 60 seconds — most people give it ten and wonder why their roots never feel clean. Then rinse well.
What to pair with them
Neither shampoo is meant to work alone. The classic partner is Paul Mitchell The Conditioner — another original, and the cleverest bottle in the range because it works two ways. Use it as a one-minute rinse-out through the mid-lengths and ends, or smooth a small amount through towel-dried hair as a leave-in before blow-drying. At £21.45 for 300ml it earns its shelf space twice over.
If your hair is medium to coarse, coloured, or knots the moment you towel it, swap in Paul Mitchell The Detangler instead — a lightweight rinse-out conditioner with grapeseed oil that smooths everything so a comb glides through. It's the pairing I use so often we bottled it as a set: Mel's Pick: Shampoo One & Detangler Set.
And the third sibling: Shampoo Three
To complete the family — there is a Three, and it's a different animal. Paul Mitchell Shampoo Three is a clarifying shampoo for stripping out chlorine, mineral deposits and product build-up. It's not a daily wash; it's the occasional deep reset for swimmers, frequent stylers and hard-water households. Use it now and then, then go back to your One or Two.
Buying the salon sizes
If you've settled on your shampoo, the litre bottles are the sensible buy — you'll find them all in our Paul Mitchell 1 Litre — Salon Size collection. Everything we sell comes direct from SweetSquared, Paul Mitchell's official UK distributor, because we've been an authorised Signature Salon since 2006. Weekday orders before 2pm go out the same day, UK delivery takes 1–3 working days, it's free over £25, and you've got 30 days to return anything.
Frequently asked questions
Is Paul Mitchell Shampoo One or Two better for oily hair?
Shampoo Two. It's the deeper-cleaning formula of the pair, made for oilier scalps and medium to thick hair. Shampoo One is gentler and suits fine to medium hair that doesn't get greasy by day's end.
Can you use Paul Mitchell Shampoo Two every day?
Yes — both One and Two are designed as daily shampoos. Two simply cleanses more thoroughly, which is exactly what you want if you train or sweat daily. If your hair ever starts feeling dry, drop back to Shampoo One.
What is the difference between Shampoo Two and Shampoo Three?
Two is a daily shampoo for oilier scalps; Three is an occasional clarifier that strips chlorine, minerals and product build-up. Use Three every so often as a reset, not as your everyday wash.