You've done the smoothing — now comes the step that makes it stick. This heat-activated finishing serum seals the whole look in with a glass-like shine that laughs in the face of humidity.
TL;DR: A heat-activated leave-in finishing serum from L'Oréal Professionnel, powered by Keratin Sealer 5%, that locks in smoothness and controls frizz and volume for up to 10 washes while shielding hair from humidity and heat styling. Suitable for all hair types, alcohol-free and artificial colourant-free.*
Product Details and Benefits
- Powered by Keratin Sealer 5% — a heat-activated technology that seals your hair's own keratin structure for a long-lasting, mirror-sleek finish.
- Locks in smoothness and keeps frizz and volume in check for up to 10 washes*.
- Anti-humidity protection that holds its own in up to 80% humidity in the air*, so your sleek finish survives the Aussie summer.
- Doubles as heat protection up to 230°C (450°F)*, guarding strands through blow-drying and straightening.
- Used as part of the full Keratin Alpha Sleek routine, it helps transform hair for 2 weeks of smooth, frizz and volume control and cuts daily styling time in half.**
- Suitable for all hair types. Alcohol-free and artificial colourant-free.
- 50ml.
How to Use
- Shake well, then spritz into your palms — 2 to 4 sprays for fine to medium hair, 6 to 8 for thicker manes.
- Rub your hands together and smooth the serum evenly through damp lengths and ends. No rinsing — this one's a leave-in.
- Blow-dry, then finish with a straightening iron to activate the seal and lock everything in.
Pro Tip: Because it shields up to 230°C (450°F), this serum pulls double duty as your heat protectant — so on the days you reach for it, you can skip your separate heat-protect spray and keep your styling routine gloriously short.
Why You'll Love It
Think of it as the topcoat to your smoothing routine — the step that turns "nicely blow-dried" into glass-like, humidity-proof shine. Add it to your cart and seal the deal on frizz-free days.
*Based on instrumental testing of the serum, as published by L'Oréal Professionnel (lorealprofessionnel.com). **Based on instrumental testing after 4 applications of the full Keratin Alpha Sleek routine (Shampoo + Smooth Transformer + Serum), as published by L'Oréal Professionnel; reflects the full routine rather than the serum used on its own.
