How to Grow Longer, Stronger Hair NZ (Redken Extreme Length)

You can't make hair grow faster from a bottle — that is decided at the scalp. What you can do is stop losing the length you grow, and that is exactly the problem Redken Extreme Length is built to solve.

Here is the part most people miss: the average head grows around a centimetre a month no matter what. If your hair never seems to get longer, it is almost always because the ends are snapping off as fast as the roots grow. Win the ends and you win the length. Extreme Length, formulated with biotin, is the range we recommend for length-keepers.

The one that does the work: the Sealer

Extreme Length Sealer is a leave-in treatment for the ends, and it is the product that actually moves the needle. It strengthens and seals fragile ends against the splitting and snapping that quietly costs you length, with heat protection built in. Mist it through damp lengths and ends before drying, every time.

The supporting routine

Extreme Length Shampoo and Conditioner cleanse gently and fortify with biotin so hair is stronger from root to tip. The Triple Action Mask is the weekly deep treatment — fifteen minutes of intensive strengthening for hair you are trying to grow out, especially if it has been coloured or heat-styled.

The honest length checklist

• Protect the ends daily. The Sealer or a leave-in before every blow-dry. This is the habit that grows hair.
• Heat down, guard up. Lower your iron temperature and always use heat protection. Heat damage is the number-one length thief.
• Micro-trims, not big cuts. A tiny dust every 10-12 weeks removes splits before they travel up the shaft — you lose half a centimetre to keep five.
• Feed the scalp. Growth is health-driven — sleep, protein, iron and a calm scalp matter more than any "growth" claim. For scalp health see our scalp guide.

What to expect

Hair feels stronger within a couple of washes; the visible length payoff is a few months of not snapping ends off. It is the unglamorous truth, but it is the one that works. Pair it with our thinning and hair-fall guide if density is also a concern.

11% off your first UKIYO order with code WELCOME11. Free NZ shipping over $75. Genuine salon Redken, shipped from our Wānaka studio — online pricing matched to and 10c under the big retailers.