Olaplex Review: Is Your Hair Health Actually in Better Hands?

Olaplex is a haircare brand that claims to address hair damage at the molecular level through its bond-repair technology. Its formulas might help rebuild broken disulfide bonds in the hair, which may support strength, structure, and hair integrity from within.

The brand focuses on a wide range of products that include No. 1 Bond Multiplier, No. 2 Bond Perfector, No. 0 Intensive Bond Building Treatment, and No. 3 Hair Perfector.

Olaplex also provides shampoos, conditioners, masks, and styling products that may help maintain the effects of bond repair while protecting hair from heat, humidity, and other forms of daily stress.

In this review, you’ll learn about the origins of Olaplex and the science behind its formulas. We’ll also break down the full product range and explain the key benefits the brand claims to offer, so you can decide if it’s the right fit for your haircare routine.

About Olaplex

Olaplex focuses on patented bond-repair technology that addresses structural damage within the hair. The brand uses Bis-Aminopropyl Diglycol Dimaleate (BADGD), which helps maintain the strength, elasticity, and shape of all hair types. Products are structured around internal hair repair, not external cosmetic effects.

The brand first launched with professional-use procedures like No. 1 Bond Multiplier and No. 2 Bond Perfector, typically applied during salon services to reduce real-time damage. It later expanded to include a comprehensive at-home system.

Olaplex’s retail products include No.0 Intensive Bond Building Treatment, No.3 Hair Perfector, No.4 Shampoo, No.5 Conditioner, No.6 Leave-In, No.7 Bonding Oil, and newer items like No.8 Moisture Mask and No.9 Protective Serum. These are marketed for at-home application, often as part of a multi-step routine.

In 2023, Olaplex introduced the LashBond™ Building Serum and BrowBond™ Serum, extending its bond-building mechanism beyond scalp hair. All formulations are positioned around internal bond repair rather than external surface coating or conditioning agents alone.

The brand also provides Leave-ins and stylers like No. 6 Bond Smoother, No. 7 Bonding Oil, and No. 9 Bond Protector to help manage frizz, enhance shine, and also protect hair from environmental stress. Olaplex’s formulations are protected by multiple patents in the U.S. and internationally, with ongoing innovations in both salon and retail lines.

Olaplex Bestsellers

1. Olaplex Nº.7 Bonding Oil™

   Olaplex Nº.7 Bonding Oil™ may provide instant shine, enhanced color vibrancy, and silky softness that can improve dull or damaged hair into sleek, radiant strands.

   The makers advise using just 2–3 drops of this oil to reduce breakage, strengthen hair, and tame frizz and flyaways for a healthy-looking finish.

   Nº.7 Bonding Oil also provides reliable heat protection up to 450ºF, making it suitable for daily use with styling tools or exposure to environmental stressors.

   Nº.7 Bonding Oil includes Coco-Caprylate, which may boost softness and provide a lightweight, silky feel that helps your hair look naturally smooth. It also has sunflower seed oil, which might help nourish strands and protect color vibrancy. The makers also added vitamin E to Nº.7 Bonding Oil, which may help defend hair from environmental damage and free radicals.

   Beta-Carotene in Nº.7 Bonding Oil may support shine and improve the appearance of dull hair. It also combines Punica Granatum Seed Oil, derived from pomegranate, which helps improve moisture retention and smoothness, while Phenyl Trimethicone may provide a smooth slip and high-gloss finish that makes hair look polished and healthy.

2. Nº.4 Bond Maintenance® Shampoo

   Nº.4 Bond Maintenance® Shampoo by Olaplex could help strengthen, hydrate, and protect hair with every wash. It is a color-safe formula that might help reduce breakage, improve manageability, and leave hair smoother, shinier, and visibly healthier over time.

   The makers state that Nº.4 Bond Maintenance® Shampoo gently cleanses without stripping essential moisture, making it suitable for most of the hair types, including chemically treated or color-processed hair. The shampoo relies on coconut oil-derived surfactants that effectively remove impurities while maintaining your hair’s natural hydration balance.

   Panthenol is included in Nº.4 Bond Maintenance® Shampoo, which could help hydrate and improve elasticity, while Hydrolyzed Vegetable Protein PG-Propyl Silanetriol supports strength and resilience.

   As per the official website, sunflower seed oil and apricot kernel oil in Nº.4 Bond Maintenance® Shampoo can help nourish and soften your hair cuticle, adding smoothness and shine. It also has rosemary leaf extract that might help provide antioxidant protection and boost hair follicle microcirculation for maintaining a healthy scalp environment.

   The makers mention that to use Nº.4 Bond Maintenance® Shampoo, dispense a coin-sized amount into your hands and apply to wet hair. Lather thoroughly, ensuring even coverage from roots to ends, then rinse well.

3. Nº.5 Bond Maintenance® Conditioner

   As per the official website, Olaplex Nº.5 Bond Maintenance® Conditioner may reduce breakage and nourish strands, leaving hair noticeably shinier, softer, and more manageable with every use.

   Olaplex Nº.5 Bond Maintenance® Conditioner has glycerin, which acts as a humectant, maintaining long-lasting moisture retention that improves smoothness and softness. The patented Bis-Aminopropyl Diglycol Dimaleate in this formula might form cross-links that help stabilize the hair’s internal protein structure, especially under oxidative stress. Its targeted action could reduce protein loss, improve fiber integrity, and restore elasticity in hair.

   The makers have also added avocado oil in Olaplex Nº.5 Bond Maintenance® Conditioner, which could help condition and soften your hair cuticle, restoring shine and manageability without heaviness.

   To use, the makers advise applying Olaplex Nº.5 Bond Maintenance® Conditioner after shampooing with Nº.4 Bond Maintenance® Shampoo. Dispense an appropriate amount and apply to the mid-lengths and ends of your hair. Leave on for 1–3 minutes, then rinse thoroughly to reveal smooth, hydrated, and strengthened hair ready for styling.

4. Hair Repair Treatment Kit

   The Olaplex Hair Repair Treatment Kit is a comprehensive starter set that provides at-home repair for hair that feels stronger and visibly healthier. This kit offers products that may help address damage, dryness, and lack of manageability in all hair types.

   Hair Repair Treatment Kit includes the Full-Size Nº.0 Intensive Bond Building Treatment that works by rebuilding disulfide bonds, critical structural connections that give hair its strength and resilience.

   It also combines the Full-Size Nº.3 Hair Perfector™, which blends ingredients that might help restore and maintain the integrity of damaged hair.

   Bis-Aminopropyl Diglycol Dimaleate may work to re-link broken disulfide bonds that are often compromised by coloring, heat styling, or chemical exposure. This rebonding action could improve the strength and durability of weakened strands.

   Full-Size Nº.3 Hair Perfector also has panthenol, which might act as a moisture-binding agent, drawing water into the hair shaft to enhance flexibility and reduce dryness. Aloe barbadensis leaf juice could deliver soothing hydration to both the scalp and hair, while jojoba seed oil may help mimic the scalp’s natural oils, sealing in moisture and improving shine.

   For cleansing, the makers have included Travel-Size Nº.4 Bond Maintenance® Shampoo in the Hair Repair Treatment Kit, which may help remove buildup without stripping moisture. This kit also has the Travel-Size Nº.5 Bond Maintenance Conditioner, which can help deeply nourish, enhance elasticity, and leave hair soft and manageable.

5. Nº.6 Bond Smoother®

   Olaplex claims that its Nº.6 Bond Smoother might help soften your hair while helping protect against breakage and damage. It provides effective humidity resistance, allowing you to manage frizz. With built-in heat protection up to 450°F/232°C, Nº.6 Bond Smoother might support healthier styling and shield hair from thermal stress.

   As per the official website, Nº.6 Bond Smoother may help soften your hair fiber and reduce static, helping to seal the cuticle and create a smoother surface. It has coconut-derived emollients and sunflower seed oil, which provides moisture and imparts a subtle, natural shine.

   Nº.6 Bond Smoother also combines aloe barbadensis leaf juice, which may help soothe and condition both the hair and scalp, while supporting hydration and improving elasticity.

6. Nº.5 Leave-in Moisturizer & Mend Leave-in Conditioner

   Nº.5 Leave-In Moisturize & Mend Leave-In Conditioner by Olaplex could help change dry, damaged hair into softer, healthier-looking strands. It also helps hydrate instantly while working deep within the hair fiber to seal split ends and reinforce structural integrity.

   The makers state that Nº.5 Leave-In Moisturize & Mend Leave-In Conditioner also provides heat protection up to 450°F/232°C, reducing damage caused by styling tools. It uses patented Olaplex Bond Technology, which can help repair hair damage on a molecular level by rebuilding disulfide bonds. These bonds are critical for hair’s strength, elasticity, and resilience against environmental stressors.

   According to the makers, Nº.5 Leave-In Moisturize & Mend Leave-In Conditioner also has High-Adhesion Sealing Complex, which binds to split ends and fills gaps in the hair cuticle, smoothing compromised areas and preventing further fraying.

   The conditioner also combines Hydramino Replenishing Blend, a combination of Amino Acids, Squalane, Ximenia Oil, Panthenol, and Glycerin. This blend might help replenish moisture and lipids to restore softness without leaving residue. Amino Acids could help fortify hair from within, while Squalane and Ximenia Oil deliver deep hydration and improve elasticity.

7. N°.4Fine Bond Maintenance® Shampoo Liter

   Nº.4FINE Bond Maintenance® Shampoo may help strengthen fine hair while providing a noticeable lift and soft hydration. It could also help repair and protect delicate strands.

   Nº.4FINE Bond Maintenance® Shampoo might help strengthen hair against daily stress from styling, environmental exposure, and salon procedures. It could help remove buildup that can weigh hair down, while leaving the scalp refreshed and hair visibly fuller.

   As per the official website, Nº.4FINE Bond Maintenance® Shampoo combines flexible polymers, which create subtle lift and volume at the roots, giving fine hair an airy, weightless feel. The shampoo also includes low molecular weight hyaluronic acid, which can help draw and retain moisture in the hair shaft, promoting softness and hydration without heaviness.

   The Hydra-Balancing Matrix in Nº.4FINE Bond Maintenance® Shampoo could help balance cleansing with hydration to leave hair clean, smooth, and manageable. It also has Oryza sativa (rice) bran extract, which might help protect against environmental stress.

Olaplex Advantages

1. Conducts Independent Laboratory Testing

   Olaplex publishes independent laboratory testing data for several of its products, offering more transparency. For example, the brand’s No. 3 Hair Perfector has undergone Human Repeat Insult Patch Testing (HRIPT) conducted by third-party labs to assess irritation and sensitization on human skin. The test results, available in PDF format on the company’s website, indicated a “HRIPT negative” outcome, meaning no allergic sensitization was observed in the study participants.

   Other formulations, including No. 0 Intensive Bond Building Treatment, No. 4 Bond Maintenance Shampoo, and No. 5 Bond Maintenance Conditioner, have also been tested independently. The No. 0 HRIPT, in particular, evaluated cumulative irritation risk due to its higher concentration of Bis-Aminopropyl Diglycol Dimaleate. These studies were conducted as per the Good Clinical Practice standards and under dermatologist supervision.

   Olaplex has also commissioned phototoxicity testing on select leave-in products such as No. 6 Bond Smoother and No. 9 Bond Protector Nourishing Hair Serum. These tests examined whether exposure to sunlight after use could trigger adverse skin reactions, an important factor for products containing UV filters and plant-derived antioxidants. Though not required by U.S. regulations, the company opted to conduct these assessments independently. This allows you to review specific safety data, rather than relying on generalized claims of dermatological approval.

2. Uses Patented Bond‑Building Technology

   Olaplex claims to use a patented compound, Bis-Aminopropyl Diglycol Dimaleate (U.S. Patent No. 9,498,419) in its product line, developed to repair disulfide bonds that are broken during chemical procedures such as bleaching, coloring, and heat exposure. This molecule interacts with free sulfur groups generated during oxidative processes, forming covalent bonds that help re-link the internal hair structure. Unlike surface-level procedures, this approach targets the hair’s cortex, where structural damage occurs.

   If you frequently color, bleach, or heat-style your hair, Olaplex’s approach may offer deeper structural benefits than conditioners or protein masks that coat the outer layer. The patented molecule works by reinforcing the inner hair structure rather than temporarily smoothing the cuticle.

Olaplex Limitations

1. Limited Public Disclosure of Manufacturing Locations

   While Olaplex emphasizes that its products are made in compliance with Good Manufacturing Practices and undergo safety and efficacy testing, it does not publicly share where its products are manufactured. This lack of disclosure can make it difficult for you to assess the ethical and regulatory standards under which the products are produced.

   Olaplex features a proprietary ingredient, bis-aminopropyl diglycol dimaleate, but details about raw material sourcing, supply chain pathways, and the ethical or environmental standards applied to ingredient procurement are not provided in company-facing materials. Without clear information on manufacturing locations, you may find it hard to make informed choices based on safety concerns.

2. Inconsistent Customer Support

   One of the key limitations of Olaplex, based on multiple complaints filed with the Better Business Bureau (BBB), is its inconsistent and often delayed customer support. Several users reported difficulty reaching the company through emails, phone calls, or website forms, sometimes requiring repeated contact attempts over weeks or months with little to no response.

   Customers also faced challenges when trying to resolve issues such as missing promotional items, expired products, shipping delays, and adverse reactions like hair breakage or thinning. In many cases, refunds were only issued after the customer escalated the matter or rejected the brand’s initial response. Olaplex often cited a strict 60-day refund policy, which limited the options for users who experienced product-related damage outside that window, even when evidence of harm was presented.

   This suggests that if you encounter a problem with an Olaplex, you might face delays, limited accountability, or a lack of clear resolution unless you persist or seek third-party intervention. The brand’s reactive rather than proactive approach to customer concerns raises concerns about the reliability and transparency of its support in handling dissatisfaction.

Olaplex Alternative Brands

1. Virtue Labs

   Virtue Labs centers its hair repair approach on Alpha Keratin 60ku®, a full-length, human-identical keratin protein derived via bio-fermentation. Unlike hydrolyzed or fragmented proteins, this intact keratin binds directly to damaged sites along the hair shaft, integrating into the strand to fill structural gaps and reinforce both cuticle and cortex.

   Meanwhile, Olaplex uses a patented molecule as Bis-Aminopropyl Diglycol Dimaleate (U.S. Patent No. 9,498,419), which is designed to repair internal disulfide bonds broken during chemical procedures such as bleaching or heat styling. Olaplex focuses on molecular repair by reconnecting disrupted sulfur-hydrogen bonds within the hair cortex. This bond-specific mechanism is aimed at stabilizing chemically compromised hair from within.

   While both brands rely on proprietary science, the difference lies in function. Virtue restores physical structure through keratin supplementation, while Olaplex focuses on repairing internal cohesion through molecular rebonding.

   Virtue Labs organizes its products by hair goals such as Recovery, Smooth, Full, and Flourish, each pairing Alpha Keratin with targeted actives. The brand offerings include Recovery Shampoo, Damage Reverse Serum, Healing Oil, and Un-Frizz Cream. Virtue Labs claims that its formulations tend to have a lighter texture and include esters, plant extracts, and conditioning silicones for softness and manageability.

   Olaplex, on the other hand, offers a linear system (Nº.0 to Nº.9) built around consistent bond-building chemistry, with procedures intended to deeply penetrate and reinforce hair fiber integrity over time. Its product line includes options like Olaplex Nº.7 Bonding Oil, Nº.4 Bond Maintenance® Shampoo, Nº.5 Bond Maintenance® Conditioner, and Hair Repair Treatment Kit.

   Virtue’s studies focus on strength, shine, and manageability improvements from protein deposition. Olaplex highlights quantifiable bond repair and reduced breakage after single or repeated uses, particularly with products like Nº.3 Hair Perfector.

2. K18 Hair

   K18 and Olaplex both claim to address hair damage caused by chemical procedures, heat styling, and environmental stressors, but they operate through fundamentally different technologies.

   As per its official website, K18 uses its patented K18Peptide in its products, a biomimetic peptide engineered to reconnect polypeptide chains and restore the keratin structure deep within the hair cortex. Olaplex, in comparison, centers its repair system around Bis-Aminopropyl Diglycol Dimaleate, which helps restore internal strength and reduce breakage over time.

   While both brands target internal damage, K18’s method addresses broader structural issues, while Olaplex focuses specifically on disulfide bond restoration.

   Their product ecosystems reflect their core philosophies. K18 offers a focused lineup including the Leave-In Molecular Repair Hair Mask, damage shield Ph Protective shampoo, and a molecular repair hair oil.

   Olaplex, on the other hand, has developed a full routine that includes pre-procedure primers, options like Nº.3, shampoo and conditioner, and styling aids. This range allows for more flexibility, making it easier to build a personalized haircare system tailored to specific concerns and routines.

   In terms of pricing, both brands sit in the premium category but differ in structure. K18’s 50ml Molecule Repair Leave-In Mask costs $75 and is intended to be used sparingly. Olaplex’s Nº.3, priced at approximately $30 for 100ml, offers a more accessible starting point, particularly if you are including it in a multi-step routine.

   While K18 positions itself as a concentrated, lower-frequency option, Olaplex claims to offer support for consistent use across multiple steps for ongoing care. K18 offers a simplified, high-performance system, while Olaplex provides a more flexible system.

How Did We Evaluate Olaplex?

1. Brand Credibility

   To evaluate Olaplex, we looked at several key factors, including the brand’s age, history, public reputation, and third-party review ratings.

   Founded in 2014, Olaplex is a relatively young company that quickly gained attention for its patented bond-building technology, widely used in salons and at-home procedures.

   To understand how it stands with customers, we reviewed its Better Business Bureau (BBB) profile, Trustpilot presence, and ratings on Tenereteam.

   Olaplex holds an A+ rating on BBB, which indicates that it responds effectively to consumer complaints and maintains good business practices.

   On Tenereteam, it has an average rating of 4.6 out of 5, which is based on 13 reviews. Users rated it highly for customer service and price-to-quality ratio, with slightly lower, but still favorable, scores for shipping and delivery and return policy.

   However, Olaplex has no presence on Trustpilot, which may limit broader consumer insight and suggest fewer opportunities for public feedback collection. Since Tenereteam’s reviews are limited in number, the ratings may not capture the full range of user experiences.

2. Refund Policy

   We examined Olaplex’s return policy for how accessible and transparent it is for different types of customers. The brand offers a 60-day return window from the date of purchase, which gives you a reasonable amount of time to test the product.

   For U.S.-based customers, returns can be started using the Returns Portal mentioned on the official website. Once you confirm your return request, a prepaid shipping label is provided. If you don’t have a printer, you can show the digital return code at an eligible USPS location, and they’ll print the label for you. However, a $5 return fee is deducted from your refund.

   For international customers, the return process is less convenient. You’re required to cover shipping costs yourself and send the return via ground shipment to Rakuten Super Logistics, 325 Lasley Ave, Hanover Township, PA 18706-1424.

   Olaplex doesn’t accept returns for products bought outside of the official website, as you’ll need to contact the original retailer and follow their policy instead. The brand also states it reserves the right to change or terminate its return policy at any time, which introduces a level of unpredictability for future returns.

Frequently Asked Questions

1. Can Olaplex help with postpartum hair shedding?
   No. Olaplex does not target hormonal causes of hair loss. It strengthens existing hair but does not affect follicular shedding triggered by postpartum estrogen decline.
2. Can Olaplex products irritate sensitive scalps?
   Yes, in some cases. While Olaplex highlights that it excludes sulfates and parabens, ingredients like phenoxyethanol or fragrance may irritate a sensitive scalp.
3. Does Olaplex repair heat damage from styling tools?
   Yes, partially. Olaplex’s patented bond-building molecule (Bis-Aminopropyl Diglycol Dimaleate) is designed to relink disulfide bonds broken by heat styling. However, it does not reverse surface-level damage such as fiber bubbling or mechanical breakage caused by excessive temperatures.
4. Does Olaplex help with frizz control in humid weather?
   Yes, to some extent. Products like Olaplex No.6 and No.9 offer smoothing and anti-static properties that may reduce visible frizz. However, Olaplex does not position these as humidity-specific styling treatments and does not claim to form a climate barrier.

Conclusion

Olaplex focuses on repairing damaged hair using patented bond-building technology. The brand claims that its products have undergone third-party safety tests, including HRIPT and phototoxicity studies, conducted under dermatologist supervision.

Olaplex also emphasizes clean formulation standards, with formulas that are vegan, cruelty-free, and free from parabens, sulfates, and phthalates.

However, Olaplex does come with some limitations. While the brand highlights certain safety tests, it offers limited transparency around manufacturing locations and raw material sourcing. Inconsistent customer support has also been reported, particularly in cases involving refunds, shipping issues, or product-related concerns.

If you’re considering Olaplex, follow the brand’s application instructions carefully and avoid overuse, especially on fine or protein-sensitive hair. Monitor how your hair responds over time, and discontinue use if you experience dryness, buildup, or irritation. While the brand’s technology may benefit damaged hair, results are not guaranteed and may require ongoing use to maintain improvements.