Garnier Fructis Sleek & Shine Sleek and Stay Hair Serum 1.7 oz — Heat Protectant, Anti-Frizz High Shine

Garnier Fructis Sleek and Shine Sleek and Stay is a heat-activated leave-in serum that tames frizz, adds high shine and protects hair up to 450°F for long-lasting sleekness.

This lightweight serum is designed to be used after shampoo and conditioner as part of the Sleek & Shine system to lock in a smooth, glossy finish. Formulated with alpha-silane, it helps maintain a sleek look that the brand reports can last up to five washes when used with the matching shampoo and conditioner. The non-greasy, water-resistant formula is free from parabens, phthalates and DMDM hydantoin and is Leaping Bunny–certified cruelty-free.

How does this serum control frizz and deliver shine?

The formula uses alpha-silane to coat hair strands and reduce surface friction so cuticles lie flatter. That smoother surface reflects light better, producing an ultra-glassy shine without heavy residue. Because it’s heat-activated, styling tools help set the finish for longer wear.

• Alpha-silane helps create a sleek barrier along the hair shaft.
• Leaves hair with a glossy, reflective surface.
• Lightweight, non-greasy feel that won’t weigh hair down.

Will it protect my hair from hot tools and how should I use it?

Sleek and Stay acts as a heat protectant rated up to 450°F, reducing styling stress when you blow dry and flat iron. For best results, apply to damp hair after using Sleek & Shine Shampoo and Conditioner, then blow dry and thermo-lock with a flat iron. Shake the pump bottle before dispensing and use one pump at a time to avoid excess product.

• Heat protection effective up to 450°F for styling tools.
• Apply to damp hair; do not rinse out.
• Blow dry and flat iron to thermo-lock the sleek finish.

Is the formula gentle and what ingredients or claims should I know?

The serum is formulated without parabens, phthalates and DMDM hydantoin and is cruelty-free under the Leaping Bunny program. While it provides styling benefits like frizz control and shine, it’s not a treatment for repairing severe damage; instead, it smooths and protects the hair surface during styling.

• Free from parabens, phthalates and DMDM hydantoin.
• Cruelty-free certification via Leaping Bunny.
• Designed for styling support, not as a restorative treatment.

How long will the sleekness last and what boosts longevity?

When used with Garnier Fructis Sleek & Shine Shampoo and Conditioner, the brand reports the sleek, anti-frizz effect can last up to five washes. Using the full system, applying the recommended amount, and thermo-locking with heat styling will maximize duration and water resistance.

• Lasts up to five washes when paired with the matching shampoo and conditioner.
• Thermo-locking with a flat iron increases longevity.
• Even distribution on damp hair ensures consistent results.

Who is this for: Garnier Fructis Sleek and Stay Hair Serum is aimed at people with frizzy, dry or hard-to-smooth hair who use heat styling and want a lightweight, non-greasy product that adds shine and heat protection. It’s a practical styling step for anyone seeking a sleeker finish without heavy oils, and for shoppers who prefer formulas free from parabens and phthalates and certified cruelty-free.

Ingredients

1285631 - INGREDIENTS: DIMETHICONE • BIS-(MORPHOLINOMETHYL C1-4 DIALKOXYSILOXY) DIMETHICONE • BIS-CETEARYL AMODIMETHICONE • PARFUM / FRAGRANCE (F.I.L. N70054676/1).