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

One fits into every wash you already do, the other asks you to run a separate ritual for a niche problem.

What was compared

1. Used every wash, not once a week
Olaplex No.9 goes on every time you shampoo, built into a normal routine. Phytopolléine is a 20-minute pre-shampoo soak you have to set aside time for weekly, a ritual most people skip after a few tries.
2. Shields hair every time you style
Olaplex No.9 protects up to 450F/232C whenever you blow-dry or straighten, a job most people do several times a week. Phytopolléine has no heat protection at all, so it solves a different problem entirely.
3. Shoppers rate it lower for the money
Phytopolléine sits at 3.9 stars from 55 ratings on its own product page, soft numbers for a $44.99 item. Olaplex No.9 draws far more enthusiastic reviews across hair types, from 4c curls to color-treated blondes.
4. Over six times the cost per ounce
At $10.67 a fluid ounce, Olaplex No.9 runs far cheaper than Phytopolléine's roughly $67 a fluid ounce for its tiny 0.67oz bottle. You get six times the usable product for about a third of the per-ounce cost.
5. A niche scalp fix, not a daily need
Phytopolléine stimulates scalp circulation for dry, flaky or thinning concerns, used once weekly before shampoo. If that is your actual problem, it is worth a try, but most buyers here want daily frizz and heat protection, which Olaplex covers and Phytopolléine does not.