Buy the Olaplex N°.9 Bond Protector™ Hair Serum.

A heat and damage claim you can actually check, backed by a mountain of real reviews ILES simply doesn't have yet.

What was compared

1. A heat claim with an actual number behind it
Olaplex states protection up to 450F/232C, a figure you can hold against your flat iron. ILES only promises heat protection with no stated temperature, so you are trusting marketing instead of a spec.
2. Bond-repair chemistry with years of proof
Olaplex's bis-aminopropyl diglycol dimaleate technology runs across its whole line and has years of documented real-world use behind it. ILES leans on a vaguer peptide technology claim with far less independent backing.
3. Thousands of real reviews, not a handful
Olaplex No.9 has a deep pool of genuine Amazon reviews, good and bad, so you know what you are actually buying. ILES shows mostly scattered reviews from the brand's own site and influencer posts, thin evidence for the price.
4. No silicone film building up on your hair
Olaplex No.9 is explicitly silicone-free and vegan, so it will not leave the waxy coating some serums build up over months of daily use. ILES does not state either of these, so you cannot be sure what is actually sitting on your strands.
5. Yes, ILES is cheaper per ounce. Buy Olaplex.
ILES runs about $7.99 per fl oz against Olaplex's $10.53, a real saving if you blow through serum fast. But you are trading a heat-tested, bond-repair formula backed by thousands of reviews for a thinner-evidence bottle, and for most people that gap is a few dollars a month, not a reason to switch.