KÉRASTASE Heat Protectant Hair Serum – 5.1 oz, Argan Oil & 450°F Thermal Shield, Frizz Control

This lightweight priming serum blends nourishing oils and heat defense to help transform dry, brittle, or aging hair into smoother, more resilient strands before styling. Designed to be applied to towel-dried hair, it prepares your lengths for blow-drying and heated tools while delivering hydration, shine, and 24-hour frizz control even in humid conditions.

How does this serum protect hair from heat and styling damage?

The formula contains ingredients that form a protective layer around the hair shaft, reducing breakage and moisture loss from hot tools. It’s engineered to withstand temperatures up to 450°F, so it acts as a barrier during blow-drying, flat-ironing, or curling.

• Thermal barrier resists high styling temperatures
• Helps prevent split ends and heat-induced breakage
• Leaves hair pliable for safer styling

What smoothing and frizz-control benefits can I expect?

Chronologiste serum softens and controls flyaways for a sleeker finish immediately after blow-drying. It reduces frizz for up to 24 hours and helps repel humidity so styles stay smoother in damp weather.

• Instantly smooths cuticle for a glossy look
• 24-hour frizz reduction in up to 80% humidity
• Improves manageability for easier styling

Which nourishing oils are in the blend and what do they do?

The composition includes argan, marula, and camellia oils chosen for their lightweight hydration and shine-enhancing properties. Each oil helps replenish moisture and reduce friction along the hair shaft, lowering breakage risk during styling.

• Argan oil: adds softness and visible shine
• Marula oil: lightweight hydration without weighing hair down
• Camellia oil: smooths fibers and improves slip for less breakage

How do I use the serum for best results?

For optimal performance, apply to clean, damp hair directly after shampoo and mask from the Chronologiste line. Work evenly through lengths and mid-lengths, leave in, then blow-dry or style with heated tools as needed.

• Use after Chronologiste shampoo and mask for a complete regimen
• Apply to towel-dried hair, focusing on mid-lengths to ends
• Leave in — do not rinse; proceed to blow-dry or style

Who is this for: This leave-in serum suits anyone with dry, damaged, brittle, sensitized, or mature hair seeking heat protection plus visible smoothing. It’s particularly helpful for people who frequently use heated styling tools, live in humid climates, or want a lightweight oil-enriched primer that strengthens and polishes hair without added weight.

Ingredients

Water, Beeswax, Dimethicone, Isopropyl Myristate, Phenoxyethanol, Hydroxypropyl Guar, Peg-40 Hydrogenated Castor Oil, Triethanolamine, Hydroxyethylcellulose, Caprylyl Glycol, Dimethiconol, Peg-30 Glyceryl Stearate, Hydrogenated Styrene/Butadiene Copolymer, Ethylhexylglycerin, Benzyl Salicylate, Hexyl Cinnamal, Acrylates/C10-30 Alkylacrylate Crosspolymer, Benzyl Alcohol, Disodium Stearoyl Glutamate, Limonene, Citronellol, Tocopherol, Bisabolol, Sodium Hyaluronate, Safflower Glucoside, Geraniol, Hydroxycitronellal, Coumarin, Butylene Glycol, Peg-30 Dipolyhydroxystearate, Trideceth-6, Linalool, Farnesol, Alteromonas Ferment Extract, Sodium Citrate, Parfum/Fragrance, C243628/1.