How to Choose a Shampoo: Match It to Your Scalp, Then Your Hair

Start with your scalp, not the bottle's promises

Shampoo is a scalp cleanser, so the scalp decides what you buy. The lengths of your hair only need to survive the rinse, which is why the claims about shine and volume on the front label matter far less than what the formula does to the skin underneath.

Ask yourself three questions before you shop: is my scalp greasy by the end of the day, does it itch or feel tight after washing, and do I see flakes on my shoulders? Those answers narrow the shelf to one or two types.

• Greasy by evening: a regular or deep-cleansing shampoo is fine.
• Tight or itchy after washing: a mild, sulfate-free or "gentle" formula.
• Flakes or scale: an anti-dandruff shampoo with a listed active ingredient.
• Red, sore or patchy: stop experimenting and see a doctor or dermatologist.

Do sulfates matter?

Sulfates matter mainly if your scalp is dry or your hair is curly, coily or fragile. Sodium lauryl sulfate and sodium laureth sulfate are strong detergents that make rich lather and strip oil efficiently, which suits a greasy scalp and short, straight hair.

The same strength can leave textured hair rough and a sensitive scalp tight. Sulfate-free shampoos use milder surfactants such as cocamidopropyl betaine or glucosides. They lather less, and that is normal, so resist the urge to use twice as much.

Reading an anti-dandruff label

An anti-dandruff shampoo works because of one named active ingredient, so read the active line before anything else. The American Academy of Dermatology lists zinc pyrithione, salicylic acid, sulfur, selenium sulfide, ketoconazole and coal tar as the options to look for.

If one active does not help after a few weeks, dermatologists suggest trying a shampoo with a different one. The full routine, including contact time, is on our page on how to get rid of dandruff.

When you need a clarifying shampoo

A clarifying shampoo is a deep cleanser for buildup, and most men need one only every two to four weeks. It removes the film that oil-based pomade, silicones, hard water minerals and pool chlorine leave behind, which you notice as hair that feels coated, limp or oddly stiff even after washing.

Use it on its own, then condition, because clarifying formulas are deliberately harsh. Regular swimmers can look for a shampoo marketed for swimmers; our notes on protecting hair from chlorine explain why.

Matching the formula to your texture

Once the scalp is sorted, texture is the tiebreaker. Fine or thin hair looks fuller with light "volumizing" shampoos that skip heavy oils. Thick, coarse or curly hair prefers "moisturizing" or "hydrating" formulas with glycerin, oils or butters near the top of the ingredient list.

Grey hair has its own needs, including a purple shampoo now and then to counter yellowing; see our guide on caring for grey hair. Fragrance is the one ingredient worth avoiding across all types if your scalp reacts easily, because it is a common trigger of irritation.

Testing a new shampoo without wrecking your scalp

Give any new shampoo at least two weeks before judging it, since the first wash or two often feels different simply because the old product is rinsing out.

1. Change one product at a time so you know what caused any change.
2. Use a coin-sized amount on the scalp only and lather with your fingertips.
3. Rinse for longer than feels necessary; leftover shampoo can itch.
4. Note how the scalp feels the next morning, not just in the shower.
5. Stop and switch back if you get burning, redness or a rash.