Quick answer: the best hair mask depends on what your hair needs. For dry hair, choose a moisturising mask rich in butters and oils. For damaged, brittle hair that snaps, choose a strengthening mask with proteins. For frizz, a hydrating, smoothing mask; for coloured hair, a colour-protecting mask; for brassy blonde, a toning mask; and for curls, a rich detangling mask. Use it once or twice a week on towel-dried lengths and ends for 5 to 10 minutes, then rinse.
A hair mask is a more concentrated, longer-acting treatment than a conditioner. But "hair mask" covers very different formulas, and the wrong one can leave hair flat, greasy or no better than before. Here's how to match the mask to the problem.
Which hair mask do you need?
- Dry, dehydrated hair that feels rough and lacks shine: Nourishing Hair Mask, with organic oat extract, illipé butter and organic coconut oil to restore softness, shine and elasticity.
- Frizzy, unruly hair: Hydrating Hair Mask, a weekly frizz treatment with amaranth and linseed extracts and cotton seed oil that smooths the hair fibre.
- Damaged, brittle hair from bleach, heat or chemical treatments: Restructurizing Hair Mask, with strengthening plant proteins, organic wheat extract, olive and argan oils.
- Coloured or highlighted hair: Protective Hair Mask, an acidic formula that seals the cuticle to help colour last.
- Brassy blonde hair: Cold Reflections Hair Mask, which tones out yellow and orange while it conditions lightened lengths.
- Curly, coily or wavy hair: Curly Hair Detangling Mask, rich in coconut, chia seed and sacha inchi oils, gentle enough to use every wash in place of conditioner. It won Best Afro Hair Mask at the Hair Magazine Hot 100 2023.
- Fine hair that a rich mask weighs down: Energizing Hair Mask, light enough for frequent use.
- Dull hair that needs shine: Antioxidant Hair Mask, with organic carrot extract and shea butter.
- Sensitive scalp: Sensitive Scalp Hair Mask, Cosmos Natural certified and dermatologically tested on sensitive skin.
Dry hair vs damaged hair: why it matters
Dry and damaged hair often go together, but they need different things.
- Dry hair is short of moisture and oil. It feels rough and looks dull, but it bends rather than snaps. It needs moisture: butters, oils and humectants.
- Damaged hair has a weakened structure, usually from bleach, colour, heat or chemical straightening. It snaps easily, feels gummy or stretchy when wet, and has split ends. It needs strengthening ingredients such as proteins, as well as moisture.
If your hair is both, alternate: a strengthening mask one week and a moisturising mask the next. Too much protein can leave hair stiff and straw-like, so balance matters.
Can a hair mask repair damaged hair?
Not permanently. Hair is not living tissue, so no mask can heal split ends or fully rebuild a damaged strand. What a good mask can do is fill and smooth the damaged surface, add strength and flexibility, and reduce breakage, so hair looks and feels much healthier. Split ends need a trim. For severely damaged hair, ask your salon about an in-salon reconstructive treatment. Read more in our guide to treating dry, damaged hair.
How to use a hair mask properly
- Shampoo first. A mask works best on clean hair.
- Squeeze out the water. Gently press or towel-dry your hair. A mask on dripping hair is diluted and slides off.
- Apply to the lengths and ends, where hair is oldest and driest. Keep rich masks away from the roots unless the mask is made for the scalp.
- Comb it through with a wide-tooth comb so every strand is coated.
- Leave it for 5 to 10 minutes, or as the label says. Wrapping hair in a warm towel helps.
- Rinse thoroughly, then follow with conditioner if the mask's instructions say so.
How often should you use a hair mask?
Once or twice a week suits most hair. Very dry, curly or bleached hair can take more; fine or oily hair usually needs less. Our full guide: how often should you use a hair mask?
Hair mask vs conditioner: what's the difference?
A conditioner works in a minute or two to detangle and smooth the surface after every wash. A mask is richer and stays on longer, so it delivers more conditioning, usually once or twice a week. Most people need both: conditioner every wash, a mask weekly.
Frequently asked questions
What is the best hair mask for dry, damaged hair in the UK?
Look for one that matches the main problem: a moisturising mask with butters and oils if your hair is dry, or a strengthening mask with proteins if it breaks easily. From our range, that's Nourishing Hair Mask for dry hair and Restructurizing Hair Mask for damaged hair. All Insight masks are vegan and made in Italy.
Can I leave a hair mask on overnight?
It isn't necessary: most masks do their work in 5 to 10 minutes. Leaving one on for hours won't give much extra benefit and can leave some hair limp. Follow the time on the label.
Should I use a hair mask before or after conditioner?
Usually after shampoo and before conditioner, but check the instructions: some masks replace conditioner.
Do hair masks work on fine hair?
Yes, if you choose a lightweight one and keep it to the ends. Rich masks can weigh fine hair down.
Can a hair mask make my hair grow?
No. Masks condition the hair you already have. Healthier lengths break less, which can help you keep length, but a mask can't change how fast hair grows.
Are your hair masks vegan?
Yes. Every Insight mask is vegan and cruelty-free.
Shop all hair masks.
About the author
Charlotte Read has spent six years in the hair industry with Insight Professional and holds a First Class BSc in Business Management and Marketing. She writes with reference to real salons across social media and the wider Insight community, and draws on the Insight office team, who between them bring over 100 years of combined experience on salon floors.
Where technical expertise is needed, Charlotte consults Lorraine Matic, Head of Insight UK Education, who brings over 38 years of global experience in colour, technique and hair science.