Sulphate Free Shampoo: Is It Really Better?
The label is everywhere. Whether it is worth paying for depends entirely on your hair, your scalp and your colour.
A sulphate free shampoo cleans using milder surfactants instead of sodium lauryl sulphate or sodium laureth sulphate. It lathers less, strips less oil and is gentler on a sensitive scalp and on colour-treated hair. It does not grow hair, and it is not automatically better for everyone. The people who notice the biggest difference are those with dry, coarse, curly or colour-treated hair and those whose scalp reacts to a strong detergent.
Key Takeaways
- Sulphates are detergents. They are extremely good at their job, and that is precisely the problem for some hair types.
- Big lather is a marketing signal, not a cleaning measurement. Gentler surfactants clean perfectly well with far less foam.
- The clearest beneficiaries: colour-treated, dry, coarse, curly and coily hair, and anyone with an itchy or reactive scalp.
- If your hair is fine, oily and behaving itself, sulphates are probably not doing you any harm.
- Switching is a change in cleansing, not a change in growth. Do not expect it to affect hair loss, and give your hair two to four washes to settle.
What are sulphates, and what do they actually do?
Sulphates are anionic surfactants, the workhorse detergents in most conventional shampoos. The two you will see most often are sodium lauryl sulphate, usually abbreviated to SLS, and the slightly milder sodium laureth sulphate, SLES.
A surfactant molecule has a water-loving end and an oil-loving end. In a wash, the oil-loving end grabs sebum, styling product and airborne grime, and the water-loving end lets all of it rinse away. Sulphates do this exceptionally efficiently, which is why they became the industry default, and they generate the thick foam most people unconsciously read as cleanliness.
Efficiency is the whole story here. A sulphate does not distinguish between the sebum you want gone and the lipids on the hair fibre and scalp that you want left alone. For plenty of people that hardly matters. For others it means a scalp that feels tight after every wash and hair that turns to straw.
Is a sulphate free shampoo genuinely better for your hair?
A sulphate free shampoo is better for some hair and irrelevant for other hair, and the honest answer depends on which of the four situations below you are in. A review of shampoo ingredients and scalp health published in Current Pharmaceutical Biotechnology in 2015 sets out the same basic trade-off: stronger surfactants clean more thoroughly and carry more risk of irritation and lipid removal.
| Your hair and scalp | Does switching help? | Why |
|---|---|---|
| Colour-treated or bleached | Yes, clearly. | Strong detergents lift dye molecules along with oil, and bleached hair has a compromised cuticle that lets colour escape more easily. This is where the switch pays for itself fastest. |
| Dry, coarse, curly or coily | Yes. | These hair types are naturally drier because sebum struggles to travel down a curved shaft. Removing what little there is makes frizz and breakage worse. |
| Sensitive, itchy or eczema-prone scalp | Usually. | Sulphates are a well-recognised skin irritant at higher concentrations, which is exactly why dermatology researchers use them as a standard irritant in patch testing. |
| Fine, oily, straight, uncoloured | Not necessarily. | You may find a milder shampoo leaves your roots greasy sooner and needs more frequent washing. If your current shampoo suits you, there is no reason to switch on principle. |
The thing nobody tells you about lather
Foam is produced by the surfactant, not by the cleaning. Manufacturers add foam boosters precisely because customers distrust a shampoo that does not bubble. When you switch, the first two or three washes will feel underwhelming and your hair will still be clean. Use a little more, work it into the scalp rather than the lengths, and wash twice if you use a lot of product.
What changes when you switch, and how quickly?
Expectations are where most people go wrong, so here is a realistic sequence.
- Washes one and two. Less foam. Possibly a slightly heavier, coated feeling if you are coming off a silicone-heavy routine, because the milder surfactant is not stripping the build-up as aggressively.
- Washes three and four. Things settle. The scalp usually stops feeling tight after rinsing. This is the point at which most people decide whether they like it.
- Weeks three to six. Colour holds noticeably longer if you colour your hair. Ends feel less brittle. Fewer short broken pieces in the sink.
- Ongoing. Some people find they need a clarifying wash every four to six weeks to reset build-up. That is normal and not a sign the shampoo has failed.
Will a sulphate free shampoo help with hair loss?
No, and it is worth being precise about why, because three different problems get bundled together under the word thinning.
- Hair loss is follicular. The follicle itself changes, producing finer, shorter hairs over successive cycles, as in androgenetic alopecia. Nothing in a bottle of shampoo alters that.
- Hair shedding is a cycle event. Many follicles enter the resting phase together after a trigger such as illness, a crash diet, childbirth or major stress, and the shed shows up two to three months later. It usually resolves without intervention.
- Hair breakage is the fibre snapping partway along its length. Your hairline is unchanged but your length will not increase, and you find short broken pieces rather than full-length hairs with a bulb at the root.
A gentler wash acts on the third of those, and only the third. If your ends are snapping because your hair is chronically dry, a gentler wash genuinely helps. If your parting is widening, that is a different conversation and one to have with your GP or a pharmacist. Our guide to what causes hair damage is the right starting point for breakage, and how to prevent split ends covers the handling habits that matter most.
Get a discount on the dry and damaged hair range
Join the Watermans mailing list and we will email a discount code straight to your inbox, so you can try the dry and damaged hair range for less. Vegan, made in the UK, over 5 million bottles sold since 2012.
How do you tell whether your shampoo contains sulphates?
Read the ingredients list, not the front of the bottle. Look for anything ending in sulphate or sulfate, and remember that the American spelling is used on many labels.
- Sodium lauryl sulphate (SLS) and sodium laureth sulphate (SLES) are the two main ones.
- Ammonium lauryl sulphate and ammonium laureth sulphate behave similarly.
- Sodium coco-sulphate is often marketed as a natural alternative. It is a sulphate. It is derived from coconut oil, which is a different point entirely.
- Milder replacements to look for instead: cocamidopropyl betaine, coco glucoside, decyl glucoside, sodium cocoyl isethionate and disodium laureth sulfosuccinate.
Ingredients are listed in descending order of concentration, so a surfactant appearing second or third, just after water, is doing most of the cleaning.
What should you look for in a good sulphate free shampoo?
Removing sulphates is only half the job. What replaces them, and what else is in the bottle, decides whether the swap is an upgrade or just a different bottle.
Look for a mild primary surfactant, a humectant such as glycerin, conditioning agents such as panthenol or niacinamide, and a hydrolysed protein if your hair is prone to breakage. Then look for what is missing: a mild-surfactant formula that is heavy on drying alcohols is not a gentler wash in any meaningful sense.
Watermans Grow Me is sulphate free, which is why it turns up on this page rather than as a generic recommendation. It pairs with a conditioner, and that pairing matters more than either product alone, because conditioning is what actually reduces breakage.
Grow Me® Hair Growth Shampoo £14.95
A sulphate free daily cleanse with caffeine, biotin, rosemary, niacinamide and hydrolysed lupine protein. Reduces breakage for fuller-looking hair without stripping the scalp. Vegan and made in the UK.
Condition Me® Hair Growth Conditioner £13.95
The breakage-defence half of the pair. Cholesterol, shea butter, glycerin and hydrolysed lupine protein smooth the cuticle so strands detangle instead of snapping.
Masque Me® Hair Mask £24.95
Once a week, for hair that is already dry, coloured or heat-damaged. Deep conditioning does the repair work a gentler shampoo cannot do on its own.
Which habits matter more than the shampoo itself?
Switching shampoo is one variable. These are the others, and several of them outweigh it.
- Wash the scalp, condition the ends. Shampoo belongs on the skin. Conditioner belongs from mid-length down. Reversing this is the single most common routine mistake.
- Turn the water temperature down. Hot water opens the cuticle and accelerates colour loss.
- Do not rub hair dry. Wet hair is at its weakest. Squeeze it in a towel instead.
- Use heat protection if you use heat. Non-negotiable if you also colour your hair.
- Detangle from the ends upwards. Working root to tip drags every knot down the shaft.
If your hair is already dry rather than just at risk of it, how to fix dry hair sets out a four-step routine, and argan oil for hair covers where an oil fits alongside a gentler wash.
Please note: Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary.
Frequently asked questions
Is sulphate free shampoo better for everyone?
No. A sulphate free shampoo is clearly better for colour-treated, dry, coarse, curly and coily hair and for a sensitive scalp. If your hair is fine, oily, straight and uncoloured, and your current shampoo suits you, there is no particular reason to switch.
Does sulphate free shampoo clean properly?
Yes. Milder surfactants remove sebum and product build-up perfectly well. They simply produce far less foam, and most people equate foam with cleaning. If you use a lot of styling product, washing twice with a small amount works better than one heavy application.
Will switching stop my hair falling out?
No. Cleansing has no effect on the follicle. A gentler wash reduces breakage, which is a real and worthwhile gain, but it will not change follicular hair loss or shorten a shedding episode.
How long until I see a difference?
Two to four washes for how your scalp feels, and three to six weeks for colour retention and the condition of your ends. The first couple of washes often feel worse rather than better while build-up rebalances.
Is sodium coco-sulphate sulphate free?
No. Despite being coconut derived and frequently marketed as a natural option, sodium coco-sulphate is a sulphate surfactant and behaves much like the others.
Do I still need a clarifying wash?
Many people do, roughly every four to six weeks, particularly if they use silicones, dry shampoo or styling products regularly. Needing an occasional reset does not mean the gentler shampoo is failing.
Is sulphate free the same as natural or organic?
No. They are unrelated claims. A sulphate free shampoo can be entirely synthetic, and a product marketed as natural can still contain a sulphate. Read the ingredients list rather than the front label.
Will it help with dandruff or an itchy scalp?
It often helps with itch caused by irritation and dryness, because it removes less of the scalp's protective lipid layer. Persistent flaking, soreness or scaling is worth showing to a pharmacist or your GP rather than solving by shampoo alone.
The bottom line
A sulphate free shampoo is a genuine upgrade if you colour your hair, if your hair is dry, coarse, curly or coily, or if your scalp reacts to a strong detergent. It is a lateral move if your hair is fine, oily and perfectly happy. Judge it on how your scalp feels after four washes and on how long your colour holds, not on how much it foams.
What it will not do is change what is happening at the follicle. Keep those two questions separate and you will make a better decision about both. Watermans has sold over 5 million bottles since 2012, and everything we make is vegan and made in the UK.
Sources & References
- Chiu CH et al., A Review: Hair Health, Concerns of Shampoo Ingredients and Scalp Nourishing Treatments, Current Pharmaceutical Biotechnology, 2015
- Gavazzoni Dias MF, Hair cosmetics: an overview, International Journal of Trichology, 2015
- Physiology, Hair, StatPearls, NCBI Bookshelf
- Telogen Effluvium, StatPearls, NCBI Bookshelf
- NHS, Hair loss
