Olaplex N°.4 Bond Maintenance™ Hair Strengthening Shampoo: Repairs Damage & Defend Against Future Breakage | Replenishes…
Best for
Best overall
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$23.01
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the verified-purchase reviewers we read, Olaplex N°4 Bond Maintenance shampoo carries the deepest pool of feedback in this category by far, with roughly 78,700 ratings averaging 4.6 stars. The recurring themes in that customer feedback are improved manageability and reduced breakage on chemically treated, bleached, and heat-damaged hair, which aligns with the brand's bond-repair positioning. That breadth and consistency of sentiment is the main reason it lands at the top here.
What reviewers liked
- Largest verified-purchase review base in the pool (about 78,700 ratings) at a 4.6 average
- Customer feedback consistently cites reduced breakage and better manageability on chemically treated hair
- Marketed for all hair textures, from coily to straight
Where it falls short
- Among the higher-priced picks per ounce
- No independent lab or expert testing was present in the data to verify bond-repair claims
- Some reviewers note it is not a cure for severely over-processed hair
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Across the verified-purchase reviewers we read, Olaplex N°4 Bond Maintenance shampoo carries the deepest pool of feedback in this category by far, with roughly 78,700 ratings averaging 4.6 stars. The recurring themes in that customer feedback are improved manageability and reduced breakage on chemically treated, bleached, and heat-damaged hair, which aligns with the brand's bond-repair positioning. That breadth and consistency of sentiment is the main reason it lands at the top here.
We want to be clear about the limits of this verdict: the data we synthesized for this product contained no independent testing, no expert reviews, and no specialist-community threads, so we cannot corroborate the bond-building claims against lab measurement. The ranking rests on the strength and volume of retailer ratings alone. Reviewers do flag that it is among the pricier options and that a bond shampoo is not a magic fix for hair that is severely over-processed.
- A highly concentrated, color-safe shampoo proven to reduce breakage and nourish hair leaving it smoother, shinier, and more manageable with every wash.
- 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.
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