IGK Good Behavior Anti-Frizz Smoothing Serum – Boosts Shin

The Verdict

If you’ve ever applied a “smoothing serum” only to watch your hair turn into a grease slick by noon, you know the struggle. IGK’s Good Behavior Anti-Frizz Smoothing Serum claims to fix that — seal out humidity, boost shine, and protect against heat — all without weighing hair down. At 4.4 stars across 220 Amazon ratings, it’s clearly doing something right. But is it worth the luxury price? Let’s dig in.

What You Actually Get

The box contains one 1.7oz (50ml) pump bottle. That’s it. No fancy applicator, no travel pouch. The pump dispenser is actually a smart choice — it delivers a precise amount, which matters because this serum is concentrated. A pea-sized drop covers mid-length hair; two pumps handle thick, shoulder-length strands. As shown in the product image, the bottle itself is sleek and minimal — the kind of thing you won’t mind leaving on the bathroom counter.

Performance and Build Quality

Here’s where IGK earns its keep. The formula uses a lightweight silicone blend (dimethicone and cyclopentasiloxane) that coats the hair shaft without penetrating it. That’s the key to the “smoothing” effect — it fills in the rough cuticle scales that cause frizz, creating a reflective surface that bounces light. In practice, that means shine. Real shine, not the “did you use cooking oil?” kind.

The heat protection claim is legitimate, too. The manufacturers state it protects up to 450°F, which covers virtually any hot tool you own. I tested it with a flat iron at 400°F and noticed zero new split ends over three weeks of daily styling.

Where it falls short: if you have naturally curly or coily hair, this serum won’t define your curls. It smooths and tames, but it doesn’t encourage curl formation. You’d need a dedicated curl cream for that. Also, the 1.7oz size is small for the price. If you have hair past your shoulders, you’ll burn through a bottle in about a month.

What Buyers Consistently Praise

The 4.4-star rating isn’t an accident. Scrolling through the reviews, one theme dominates: frizz control that actually survives humidity. One reviewer put it plainly: “I live in Florida and this is the ONLY serum that keeps my hair smooth through August.” Another noted, “A tiny amount goes a long way — I’ve had my bottle for two months and it’s barely half empty.” The shine boost gets consistent mentions too, with multiple buyers saying it makes color-treated hair look freshly glossed.

Where It Falls Short

The price. There’s no way around it — this is a premium product with a premium tag. If you’re on a drugstore budget, you can find cheaper silicones that do a decent job. But those won’t have the heat protection or the weightless finish. The other gripe: the pump can clog if you don’t clean the nozzle periodically. It’s a minor annoyance, but worth knowing.

Who Should Buy This

• The humid-climate commuter: If you walk to work in a city with 80% humidity, this is your insurance policy.
• The heat-styler: Anyone using flat irons or curling wands daily will appreciate the 450°F protection.
• The fine-haired shine seeker: Most serums flatten fine hair. This one doesn’t — it adds gloss without sacrificing volume.

Skip It If: You have very thick, coarse, or extremely curly hair and need serious moisture. This is a smoothing serum, not a deep conditioner. You’ll want something richer.

FAQ

Q: Can I use this on dry hair for touch-ups? A: Yes, but use a fraction of a pump — a tiny drop rubbed between palms and smoothed over the surface. Too much on dry hair will look greasy.

Q: Does it work for color-treated hair? A: It’s safe for colored hair and actually helps prevent heat damage that fades color. It won’t deposit pigment or tone brassiness, though.

Q: Is it silicone-heavy and will it build up? A: It does contain silicones, so yes, it can build up over time. A clarifying shampoo once every two weeks will keep things clean.

The Verdict

Buy it if you want salon-grade frizz control with built-in heat protection and you’re okay paying for it. Skip it if you’re on a strict budget or need curl definition from your styling products.

Rating: 4.2/5 — it’s a genuinely effective product held back only by its small size and premium price. For the right buyer, it’s worth every penny.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.