Co-Washing or Shampoo: Who Should Wash Their Hair with Conditioner?

"Throw out your shampoo and wash with conditioner" — advice that makes half the population twitch. Yet co-washing has an army of devotees with enviable curls. Let's figure out who it genuinely suits — and who it guarantees permanently unwashed hair.

How it works

Curly hair is badly designed for self-lubrication: sebum struggles to travel down a spiral, so curls run dry along the length — and every shampoo dries them further. Hence the idea: remove aggressive cleansing altogether.

A co-wash (cleansing conditioner) isn't a regular conditioner: its base of cationic conditioning agents (Behentrimonium Chloride, Cetrimonium Chloride) has a weak — but real — cleansing action. They lift away some dirt and excess sebum while leaving the hair's lipid layer untouched. Hair comes out soft; curls come out defined and frizz-free.

Shampoo, even sulfate-free, cleans properly — including styling films and buildup. A co-wash can't do that: silicones and styling polymers accumulate under it.

That's why even devotees schedule a "reset" every week or two — a wash with gentle shampoo to clear the buildup.

Choose co-washing if

• your hair is curly, coily, dry and porous;
• you follow the curly girl method — this is its core ritual;
• your scalp is normal-to-dry with no dandruff.

Choose shampoo if

• your roots go oily within a day or two — co-washing won't cope;
• your hair is straight and fine: without real cleansing it goes flat;
• you have dandruff — the fungus needs medicated surfactants, not gentleness.

Common mistake. Starting co-washing with an ordinary drugstore conditioner — it doesn't clean at all, only layers up. The method requires an actual "cleansing conditioner" or "co-wash" on the label. And even then, the periodic shampoo reset stays mandatory.

Fun fact: co-washing went mainstream with stylist Lorraine Massey's 2001 book "Curly Girl: The Handbook" — the start of the entire curly girl method that reshaped the care industry for wavy hair.