{"product_id":"loreal-professionnel-paris-keratin-sleek-serum-heat-activated-leave-in-with-5-keratin-sealer-long-lasting-smoothness-frizz","title":"L'Oréal Professionnel Paris Keratin Sleek Serum — Heat-Activated Leave-In with 5% Keratin Sealer, Long-Lasting Smoothness \u0026 Frizz","description":"\u003cb\u003eKeratin Alpha Sleek Mirror Sleek Serum is a heat-activated leave-in treatment with 5% Keratin Sealer that smooths hair, controls frizz and humidity, and lasts up to 10 washes.\u003c\/b\u003e\n\nL'Oréal Professionnel designed this lightweight serum to be applied on towel-dried hair and activated with heat for salon-level smoothing at home. The formula locks into the hair structure to reduce frizz, tame volume and cut styling time, while offering thermal protection up to 450°F. Alcohol- and artificial colorant-free, it integrates easily into blow-dry and straightening routines to deliver long-lasting manageability for a range of hair types.\n\n\u003ch3\u003eHow does this serum reduce frizz and keep hair smooth?\u003c\/h3\u003e\n\u003cp\u003eThe serum contains 5% Keratin Sealer which bonds to and fills the hair surface when heat is applied, creating a sleeker, more uniform strand. This structural sealing helps hair resist humidity-driven swelling and keeps surface irregularities down, so hair appears shinier and lies flatter for days.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e5% Keratin Sealer targets hair structure to smooth cuticles.\u003c\/li\u003e\n  \u003cli\u003eHeat activation helps the sealer adhere and last through multiple washes.\u003c\/li\u003e\n  \u003cli\u003eFormulation resists up to 80% environmental humidity for controlled volume.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it protect my hair from heat styling and speed up my routine?\u003c\/h3\u003e\n\u003cp\u003eThe Serum offers heat protection up to 450°F, creating a shield during blow-drying or flat ironing. Its lightweight texture reduces styling time by allowing tools to glide more smoothly and by lowering the need for repeated passes, so you can achieve a sleek finish faster.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThermal protection rated for high-temperature styling tools.\u003c\/li\u003e\n  \u003cli\u003eCut styling time up to half when used within the Keratin Alpha Sleek routine.\u003c\/li\u003e\n  \u003cli\u003eApply before blow-drying; finish with a straightener for longest-lasting results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use it for best, longest-lasting results?\u003c\/h3\u003e\n\u003cp\u003eApply a small amount to towel-dried hair, distribute evenly from mid-lengths to ends, and do not rinse. Blow-dry to activate the keratin sealer and for extended smoothness, finish with a straightening iron. The effect persists through multiple washes, offering manageable hair for up to ten shampoos if used as directed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse on towel-dried hair; do not rinse out the product.\u003c\/li\u003e\n  \u003cli\u003eBlow-dry to heat-activate the keratin sealer.\u003c\/li\u003e\n  \u003cli\u003eFor maximum longevity, flat-iron after blow-drying and follow the full Keratin Alpha Sleek routine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this serum suitable for all hair types and sensitive routines?\u003c\/h3\u003e\n\u003cp\u003eThe lightweight, alcohol-free formula is designed to work across textures—fine to thick, straight to curly—without weighing strands down. It does not contain artificial colorants and pairs well with other salon treatments, though those with specific scalp sensitivities should patch-test or consult a stylist.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAlcohol-free and formulated without artificial dyes.\u003c\/li\u003e\n  \u003cli\u003eLight texture prevents buildup on fine hair while providing benefits to thicker textures.\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard professional heat-styling techniques.\u003c\/li\u003e\n\u003c\/ul\u003e\n\nThis serum is for anyone wanting a professional-strength smoothing solution at home: people who frequently heat-style, those battling humidity and frizz, and anyone aiming to reduce daily styling time without heavy oils or sticky residues. Stylists and at-home users who follow a heat-activated regimen will see the clearest, longest-lasting change in manageability and shine.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long does the smooth effect last?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: When used as directed and heat-activated, smoothing can last up to 10 washes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this on colored or chemically treated hair?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes; the alcohol-free formula is compatible with colored and treated hair, but patch-test if you have concerns.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"L'Oréal Professionnel Paris","offers":[{"title":"Default Title","offer_id":53429331820891,"sku":"B0GCT6PVWS","price":50.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/9860\/9243\/files\/loreal-professionnel-keratin-alpha-sleek-serum-front-packaging.jpg?v=1782235559","url":"https:\/\/remediesbeauty.co.uk\/products\/loreal-professionnel-paris-keratin-sleek-serum-heat-activated-leave-in-with-5-keratin-sealer-long-lasting-smoothness-frizz","provider":"REMEDIESBEAUTY","version":"1.0","type":"link"}