Olaplex Nº.5 Bond Maintenance™ Hair Strengthening Conditioner: Repairs Damage & Defend Against Future Breakage | Reduce Frizz |…
Best for
Best overall
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 1 trusted source
Current price
$34.00
Updated May 18, 2026 · 1 min read
Sources behind this verdict
10 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, Olaplex No. 5 is the most-discussed conditioner in this category and the one with the deepest cross-tier validation. A r/HaircareScience thread (high-trust specialist community) engages directly with the bond-repair chemistry and concludes the disulfide bonds Olaplex helps reform are real, while noting they can be broken again by heat, chemicals, and mechanical stress.
What reviewers liked
- Highest cross-tier consensus in the category, including engagement from r/HaircareScience on the underlying chemistry
- Over 80,000 verified-purchase Amazon reviews at a 4.6 average; corroborating positive sentiment at Ulta and Sephora
- Reviewers consistently report easier detangling, less frizz, and more shine on damaged or color-treated hair
- Formulated for daily use rather than as a weekly-only treatment
Where it falls short
- r/finethinhair and r/Sephora threads flag it as too rich for fine or undamaged hair, with some reporting a greasy feel
- Premium price relative to drugstore competitors with similar softness outcomes
- Ulta reviews include scattered reports of allergic reactions
- Specialist-community consensus is that bond repair is real but reversible — not a permanent fix
Across the reviewers we read, Olaplex No. 5 is the most-discussed conditioner in this category and the one with the deepest cross-tier validation. A r/HaircareScience thread (high-trust specialist community) engages directly with the bond-repair chemistry and concludes the disulfide bonds Olaplex helps reform are real, while noting they can be broken again by heat, chemicals, and mechanical stress. That nuance — it works, but it isn't permanent magic — is the through-line of the better-informed reviews.
Verified-purchase reviewers at Ulta and Sephora consistently call out smoother frizz, easier detangling, and visible shine after a few weeks of use, and the Amazon listing carries over 80,000 reviews at a 4.6 average. The flip side surfaces in r/Sephora and r/finethinhair threads, where users with fine or undamaged hair report it feels too rich and can leave hair greasy or weighed down. A handful of users on r/finethinhair also caution that overusing bond-builders when your hair isn't damaged can backfire.
The trust-weighted read: this is the safest pick if your hair is color-treated, heat-styled, or chemically processed, and a questionable pick if your hair is fine and already healthy. Treat the bond-repair language as supported but not miraculous.
- KEY BENEFITS ✓ Repairs everyday damage and defends against future breakage ✓ Strengthens and reinforces bonds for more resilient hair ✓ Replenishes hydration and enhances softness ✓ Dramatically improves detangling and manageability ✓ Clinically proven to boost shine and reduce frizz ✓ Dermatologist Tested. Vegan. Color-Safe and suitable for chemically treated hair.
- Clinically Proven ● 2X more volumized hair, instantly & all day ● Repairs everyday damage in 1 wash ● 2X stronger hair at a molecular level ● 60% less Breakage to protect hair length and fullness [body] ● 90% more weightless hydration ● 90% easier Detangling ● Soft, smooth, and more manageable hair in 1 wash *When used as a system with Nº.4FINE Bond Maintenance Shampoo
- INGREDIENTS Panthenol and Glycerin Draws moisture to hair to keep it hydrated and helps prevent breakage.
- A little goes a long way with this highly concentrated formula. 100mL: Up to 25 applications* 250mL: Up to 50 applications* 1000mL: Up to 100 applications* *Based on average application size of 5mL After shampooing with Nº.4 Bond Maintenance Shampoo: Dispense and apply to mid-lengths and ends. Leave on for 1-3 minutes. Rinse well.
The bonds that Olaplex creates are permanent- however, all disulfide bonds are broken by thermal, chemical, mechanical, and some environmental ...
It is not a magic cure, but I think the conditioner has done a great job. It feels slightly softer and smoother than my previous conditioner ( ...
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“Olaplex No.5 Conditioner | POV | Would you buy it?” · YouTube
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