Molecular Leave-In Hair Mask – H19 Mask Repair for Dry, Frizzy Hair in 4 Minutes with This Deeply Moisturizing & Restorative Treatment

Molecular Leave-In Hair Mask – H19 Mask Repair for Dry, Frizzy Hair in 4 Minutes with This Deeply Moisturizing & Restorative Treatment

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Molecular Leave-In Hair Mask – H19 Mask Repair for Dry, Frizzy Hair in 4 Minutes with This Deeply Moisturizing & Restorative Treatment

Molecular Leave-In Hair Mask – H19 Mask Repair for Dry, Frizzy Hair in 4 Minutes with This Deeply Moisturizing & Restorative Treatment

£37.00
£37.00 £74.00
SAVE 50% Sold out

H19 Molecular Repair

Damage Does Not Have to Be the Price of Great Hair

Bleach, color, chemical services and hot tools weaken the hair's inner structure. Lengths go rough, lose bounce, frizz more easily and break before they can hold length.

H19 Molecular Repair Leave-In Hair Mask is a concentrated four-minute treatment built to repair that damage from within rather than coat it for temporary slip. Apply one to three pumps to clean, damp hair, wait four minutes, and leave it in. Hair feels smoother and softer straight away, while strength, elasticity and resilience build over the repair cycle.

2X

More resistant to breakage

After one four-minute application.*

4 min

Then style, don't rinse

No extra rinse step in your routine.

1–3

Pumps per application

Concentrated, so a little covers the lengths.

Why it is different

Repair Beyond the Surface

Traditional masks and conditioners mainly soften and detangle the outside of the hair. H19 uses a biomimetic peptide designed to match hair's keratin structure and reach damage sites inside the fiber.

The H19 peptide reconnects broken polypeptide chains and, in turn, helps reconnect the disulfide bonds that carry the hair's strength and elasticity. That is why the result goes past a temporary conditioned feel: damaged hair becomes stronger, smoother, more resilient and better able to hold its natural bounce.

Diagram of the H19 biomimetic peptide reconnecting damaged keratin chains to restore strength, elasticity, softness and bounce

Results

What You Can Expect

  • Stronger, more elastic lengths. The fiber holds tension instead of snapping under it.
  • Less breakage. In hair damaged by bleach, color, chemical services and heat.
  • Smoother texture, softer feel. Without a heavy coating sitting on top.
  • Better manageability. Less roughness, less frizz, easier detangling.
  • Renewed movement and bounce. Hair that behaves like itself again.
  • Immediate then progressive. Felt on the first use, clearest after two to three.

The more damaged the hair, the more noticeable the change tends to be.

Woman working H19 Molecular Repair Leave-In Hair Mask through clean, damp lengths

Who it is for

Built for the Damage Real Life Creates

H19 is designed for hair weakened by:

  • Bleaching, highlighting and lightening.
  • Permanent or demi-permanent color.
  • Relaxers, perms and other chemical services.
  • Flat irons, curling irons, blow-dryers and repeated heat styling.
  • Mechanical stress from brushing, detangling and everyday styling.

It works across straight, wavy, curly and coily hair because the treatment targets the keratin structure every hair type shares. Fine hair should start with one pump; longer, thicker or denser hair may need two to three.

Setting expectations: H19 repairs the strength and elasticity of existing damaged hair fibers. It is not a hair-growth treatment, and it cannot permanently fuse severely split ends that need trimming.

The method

Four Minutes, Five Steps

Shampoo

Do not condition first. Clarify beforehand if there is heavy product, mineral or metal buildup.

Towel-dry

Hair should be clean and damp, not dripping wet.

Apply 1–3 pumps

Based on length and density. Start at the ends and work upward toward the roots.

Wait 4 minutes

Before combing, adding another product or styling.

Do not rinse

Comb through, then add conditioner, leave-ins or stylers if you want them.

Use H19 for four to six consecutive shampoos after a salon service or when starting a repair cycle, then as needed for maintenance. Less is more — overapplying can leave hair feeling coated or stiff. Begin with the smallest amount that covers your lengths evenly.

The four-minute H19 routine: shampoo, towel-dry, apply one to three pumps, wait four minutes without rinsing

Order of operations

Why Conditioner Comes After H19

Conditioner can leave a film on the hair that gets in the way of the peptide reaching the inner fiber. On H19 days, shampoo first, skip conditioner, and apply the mask directly to clean, damp hair.

Once the four-minute window is up, add conditioner or any styling product your hair wants. The peptide gets a clear path first; you customise softness, slip and styling afterwards.

At a glance

The Details

Size5 fl oz (150 mL)
FormatLeave-in treatment, pump bottle
Dose1–3 pumps
Wait time4 minutes
RinseNo — leave in and style
Apply toClean, damp hair
Hair typesStraight, wavy, curly, coily
Repair cycle4–6 consecutive shampoos

The bottle

Professional Size, Without a Ten-Step Routine

The formula is concentrated, so most applications take only one to three pumps. The 5 fl oz (150 mL) professional-size bottle is sized to carry you through the initial four-to-six-wash repair cycle and ongoing maintenance — without adding another rinse step to your routine.

H19 Molecular Repair Leave-In Hair Mask professional-size 5 fl oz (150 mL) pump bottle

Questions

Frequently Asked

Is H19 a conditioner?

No. H19 is a concentrated molecular repair treatment. It is designed to repair damage inside the hair fiber rather than work as a traditional rinse-out conditioner.

Do I rinse it out?

No. Wait four full minutes, then leave it in and style as usual.

Why skip conditioner before applying it?

Conditioner can leave a film that interferes with peptide penetration. Conditioner, leave-in products, oils and stylers can all go on after the four-minute wait.

How much should I use?

Start with one pump. Use up to three based on hair length and density. More than your hair needs can leave it feeling coated or stiff.

How often should I use it?

For four to six consecutive shampoos when starting a repair cycle or after a damaging salon service. Then as needed for maintenance.

Will it work on fine, curly, coily or color-treated hair?

Yes. H19 is designed for all hair types and textures. Fine hair should start with one pump; dense, long, curly or coily hair may need more for even coverage.

When should I expect results?

Hair may feel smoother and softer after the first use. Results are progressive, and most people notice the clearest improvement after two to three applications.

Can I use other products with H19?

Yes. Wait the four minutes first, then add conditioner, leave-in conditioner, oil, heat protectant or styling products as usual.

What if my hair feels dry after use?

Use less H19 and add your preferred conditioner or leave-in after the four-minute wait. H19 is a repair treatment, not a replacement for every hair type's conditioning needs.

Why does the formula contain alcohol?

The alcohols play a functional role in preparing the hair and helping the treatment reach the inner fiber. Use the concentrated formula as directed rather than applying it like a traditional conditioner.

Formula

Ingredients

Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol, Amyl Salicylate, Benzaldehyde.

Contains hydrolyzed wheat protein and wheat starch. For external use only. Avoid contact with the eyes. Discontinue use if irritation occurs. Formulations can change — always read the ingredient list printed on your bottle before use.

Give damaged hair a second chance.

No ten-step routine. Shampoo, apply H19, wait four minutes, style. Start the repair cycle and give your lengths back their strength.

Leave-in, no rinseAll hair types5 fl oz professional size

*Reduced breakage measured on bleached hair tresses after one four-minute application. Claims about bleach, color, chemical-service and heat damage are based on improvements in strength, elasticity and breakage observed in scientific-technical testing. Individual results vary.

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