What are sulfates in shampoo?
Sulfates are strong, cheap detergents. The most common are sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES). They make the thick lather most people associate with "clean", and they remove oil very effectively — including the natural oils your scalp and hair need.
Are sulfates bad for hair?
Not for everyone. Sulfates are safe in rinse-off shampoos and many people use them without problems. The issue is that they can be more than you need:
- SLS is a well-known skin irritant in patch tests, so it can bother a sensitive scalp.
- Strong detergents raise friction and leave hair rougher, especially in hard water.
- They fade hair colour faster and can shorten the life of keratin treatments.
Who benefits most from sulfate-free shampoo?
| Your hair | Sulfate-free? |
|---|---|
| Dry, frizzy or curly | Yes — less moisture loss |
| Coloured, highlighted or keratin-treated | Yes — colour and treatment last longer |
| Sensitive or itchy scalp | Yes — gentler on skin |
| Washed daily (gym, summer) | Yes — less stripping over time |
| Very oily scalp, rarely oiled | Either works |
| Heavy styling products or wax | Use a stronger wash occasionally |
Why does sulfate-free shampoo lather less?
Milder cleansers — coconut-derived surfactants, glucosides, or traditional reetha and shikakai — make softer, smaller bubbles. Foam is not the same as cleaning power; the shampoo is still lifting oil and dirt.
Can sulfate-free shampoo wash out hair oil?
Yes, with the right technique:
- Apply shampoo to the oily scalp before adding lots of water — this helps it grip the oil.
- Massage for 1–2 minutes, add a little water and rinse.
- Do a second, quick round. The second wash lathers much more.
How do you read the label?
Look at the first few ingredients after water. Avoid "sodium lauryl sulfate", "sodium laureth sulfate" and "ammonium lauryl sulfate" if you want sulfate-free. Gentler cleansers include "cocamidopropyl betaine", "decyl glucoside", "coco glucoside" and "sodium cocoyl isethionate".
