WS Bond Serum
NEW
WS Bond Serum
WS Bond Serum
WS Bond Serum
WS Bond Serum
WS Bond Serum

WS Bond Serum

DAMAGE REPAIR LEAVE-IN TREATMENT

Ready for the healthiest hair
of your life?

Receive personalized results in under 2 minutes.

take the quiz

This product is available for Pros only.

Login here to access

Repair damaged hair from the inside out with Bond Serum, powered by our exclusive ProTarget Technology™. This lightweight leave-in treatment delivers more intense and prolonged recovery benefits than other hair repair treatments plus heat protection up to 450°F.

Double repair ProTarget Technology™ is uniquely formulated with liposomes that zero in on compromised areas of the hair. 

  • Within the fiber, a clinically proven complex with itaconic acid and arginine restores disulfide bonds that have been damaged by chemical treatments like dyes, bleach and relaxers. 

  • On the outer cuticle, nourishing ingredients including panthenol and ceramide NP replenish moisture to heal frizz and prevent split ends and breakage. Hair is stronger, smoother, softer and shinier—for longer.

For maximum absorption of its reparative ingredients, apply Bond Serum after cleansing hair with Bond Boost for New Wash.

Vegan Vegan
Leaping Bunny Certfied Leaping Bunny Certified
Silicone-Free Silicone-Free
Alcohol-Free
Paraben-Free Paraben-Free
Synthetic Fragrance-Free Fragrance-Free

Bond Serum

  • What is bond repair?

    Your hair is naturally made up of chemical bonds that are too small for the eye to see. There are three types of bonds found in our hair: disulfide bonds (which are strong), hydrogen bonds and salt bonds (which are weaker). They come together to form hair’s structural strength, elasticity and shine. 

    When hair is exposed to chemical services (like dyeing, bleaching and relaxing), pollution or heat styling, these bonds can break, resulting in reduced hair integrity. Bond Boost for New Wash and Bond Serum work to restore those broken bonds by penetrating the hair fibers with our exclusive ProTarget Technology™, which delivers crucial first aid exactly where your strands need it.

  • What is Bond Serum?

    Bond Serum is a damage-repairing leave-in treatment that is applied to damp hair. Uniquely formulated with our exclusive ProTarget Technology™, it delivers concentrated repair and heat protection with a velvety lightweight texture.

  • Who can use Bond Serum?

    Bond Serum is ideal for anyone who prioritizes the health and well-being of their hair and/or whose hair is: 

    • chemically treated (e.g., colored, bleached, relaxed or permed)
    • heat-damaged from frequent use of styling tools like flat irons or curling irons
    • frizzy
    • dry 

    Enhance the repair benefits of Bond Serum by applying after cleansing with Bond Boost for New Wash.

  • How do I use Bond Serum?
    1. Start with clean, damp hair. 
    2. Shake the bottle before using and apply to the most damaged areas of your hair, then work through from roots to tips. Use a dime-size amount for fine hair and quarter-size for thicker hair, adding more if needed. Do not rinse out. 
    3. Let it sit and penetrate your hair before continuing with your regular styling routine
  • Is Bond Serum suitable for everyday usage?

    Yes, you can use Bond Serum every day! Just make sure you use it on damp hair.

  • What is ProTarget Technology™ in Bond Serum?

    ProTarget Technology™ is our exclusive double repair efficacy complex that combines cuticle-nourishing nutrients and a clinically proven bond-restoring complex that fortifies hair from within. It delivers twice the recovery benefits of other hair repair treatments, healing and preventing compromised areas like split ends, breakage and frizz. 

  • Why is ProTarget Technology™ in Bond Serum unique?

    ProTarget Technology™ delivers double repair efficacy—meaning it heals hair inside and out—thanks to its unique formulation with liposome technology that offers these benefits:

    • Targeted delivery and enhanced penetration: ProTarget Technology™ consists of liposomes, which are tiny sphere-shaped particles that can encapsulate active ingredients like vitamins, antioxidants or other beneficial compounds. Liposomes in ProTarget Technology™ encapsulate specific active repair ingredients like panthenol and ceramides, allowing for targeted delivery and enhanced penetration. This is particularly beneficial in hair repair because it enables the delivery of reparative or nourishing substances directly to damaged areas of the hair.
    • Protection of active ingredients: Liposomes provide a protective barrier around active ingredients, shielding them from external factors that could degrade their effectiveness. 
    • Longer-lasting results: The controlled release of active ingredients from liposomes allows for a sustained and gradual release over time. This can result in longer-lasting effects compared to products without liposome technology.
  • Does Bond Serum work on all three types of hair bonds?

    Yes! ProTarget Technology™ targets hydrogen, salt and disulfide bonds in the hair by addressing the moisture, pH balance and structural integrity. This promotes an overall healthy appearance and manageability of the hair.

    Hydrogen bonds are formed between the hydrogen atoms of one amino acid and the electronegative oxygen of another; they are typically affected by water and heat temporarily. Hydrating ingredients in Bond Serum that attract moisture to the hair include panthenol, betaine, glycerin and propanediol.

    Salt bonds are formed by the negative and positive charged portions of the amino acids in the hair; they are the most stable, at an acidic to neutral pH. Bond Serum is formulated at an effective pH and buffered with citric acid to maintain the natural pH of healthy hair to stabilize these bonds.

    Disulfide bonds are formed between cysteine amino acids and are the strongest bonds in the hair. They contribute significantly to the hair’s structural integrity and strength. Disulfide bonds are affected by using products with an acidic pH to prevent swelling and damage that can occur at higher pH levels, and ProTarget Technology™ helps repair and maintain these important bonds.

  • Does Bond Serum pose a risk of protein overload?

    No. Protein overload is caused by products that contain a large amount of hair protein in their formula. Bond Boost contains only <1% arginine in its formula to synergistically work with other actives to strengthen the hair, decrease hair breakage, minimize hair loss, moisturize and (for those who color their hair) protect from the damaging effects of bleach.

  • Does Bond Serum protect hair against heat?

    Yes! Bond Serum offers heat protection up to 450°F.

  • Can Bond Serum and Bond Boost for New Wash be used together?

    Yes, we recommend using Bond Serum and Bond Boost together, as Bond Boost contains ingredients designed to interact with and repair damaged hair bonds. Through a combination of surface preparation, conditioning and moisturization, Bond Boost primes the hair to better receive the active ingredients in Bond Serum, ensuring a more thorough repair approach. As a result, when Bond Serum is applied after cleansing with Bond Boost, its reparative components may have an enhanced ability to penetrate the hair shaft.

  • Is Bond Serum vegan?

    Yes, Bond Serum is vegan.

WE’RE LISTENING

Need help? Get product tips, personalized recommendations and more from our product specialists—however works best for you.

  • On our minds at all times: the health of your hair, your scalp and our planet. We developed New Wash as a detergent-free replacement for shampoo and conditioner that nourishes hair and uses less water. We also pioneered the use of refill pouches to reduce plastic waste and continue to lead the industry with sustainable practices and packaging.

  • Once upon a time (in 2015), we set out to create haircare that is smart, simple and sustainable. The key is naturally derived ingredients: Our revolutionary New Wash cleansing cream is formulated without the harsh, hair-stripping foams found in traditional shampoo, and our multitasking styling products further transform your strands and simplify your routine.

  • Gif of New Wash pouch being recycled
  • Gif of New Wash images

SUSTAINABLE