Olaplex Nº.4 Bond Maintenance Hair Strengthening Shampoo: Repairs Damage & Defend Against Future Breakage | Replenishes Hydra
Reviewed 9 August 2026 · price checked live
Check price on Amazon →Overview
This highly concentrated, colour-safe shampoo is designed to reduce breakage and strengthen hair while it cleans, using coconut-derived surfactants for a gentle but generous lather. Olaplex cites clinical results of 90% smoother, better-detangling hair and a 49% cut in breakage when used alongside the No.3 and No.5 products. It suits damaged or colour-treated hair that needs proper care rather than a quick wash. A 4.6 rating from over 74,000 reviewers backs up the hype. It is pricey but concentrated. Have a look at the current price and availability on Amazon.
- Brand
- OLAPLEX
- Amazon rating
- 4.6 / 5 from 74,254 ratings
- vs Hair Care
- 0.1 above the category median of 4.5
- Rank in category
- 7 of 50 rated hair care we track
- Price position
- Towards the top of the range (category spans £3.49 to £47.11)
- How proven
- One of the most-reviewed in its category
How it compares in Hair Care
Across the 50 rated hair care products we track, the typical score is 4.5 out of 5. This one sits at 4.6, which is around the middle of the category. Ratings alone will not separate it from its rivals here, so price and the specifics below matter more than the star count.
It carries 74,254 ratings against a category median of 10,487. A rating from a large base is harder to distort and tends to hold up over time, so a high score here means more than the same score on a new listing.
On price it sits in the upper third of a category running from £3.49 to £47.11, where the midpoint is about £11.82. Paying above the category norm needs a reason beyond the rating, because the score alone does not justify the gap here.
Worked out from the 50 hair care products in our catalogue, not from the brand's own claims. How we rank →
Key features
- A highly concentrated, color-safe shampoo proven to reduce breakage and nourish hair leaving it smoother, shinier, and more manageable with every wash. The richly lathering formula gently yet thoroughly cleanses every hair type without stripping or drying to maintain hydrated hair and scalp. Use it with No.5 daily or any time you cleanse.
- KEY BENEFITS ✓ Reduces breakage and strengthens hair ✓ Gently cleanses without stripping moisture ✓ Hydrates, smooths, nourishes, and detangles
- Clinically Proven 90% smoother, better detangling, more conditioned* 49% reduction in breakage *When used as a system of Nº 3, Nº 4, and Nº 5.
- INGREDIENTS Gentle Blend of Coconut Oil-Derived Surfactants Provides an easy, abundant lather that leaves the scalp and hair feeling hydrated.
