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Finishing Serum Haute Performance

Finishing Serum Haute Performance

Iles Formula
Benefits
  • Hair Repairing
  • Promotes Shine
  • Detangling
  • Colour Protecting
  • Prevents Breakage
  • Heat Protection
  • Hair Nourishing
The Finishing Serum Haute Performance by Iles Formula is a weightless, heat-activated finishing treatment designed to smooth, strengthen and protect the hair while enhancing shine and manageability. It works across all hair types to refine the cuticle, control frizz and improve the look and feel of the hair without heaviness, making it ideal for both fine and coarse textures. A blend of lightweight botanical oils, including Marula, Argan, Macadamia and Pracaxi, replenishes essential lipids, seals the cuticle and boosts softness and luminosity while helping hair resist moisture loss and environmental stress. Tucumã Seed Butter further supports elasticity and smoothness, improving flexibility so hair feels stronger and more resilient rather than coated. Panthenol, Yacón Root Juice, and conditioning polymers bind moisture within the hair fiber and enhance slip, reducing friction and breakage during styling. Hydrolyzed silk and keratin amino acids reinforce weakened areas and refine the hair surface, while antioxidant vitamin E helps protect against oxidative damage. The result is hair that appears sleeker, glossier and organically fuller, with lasting smoothness, frizz control and heat-activated performance.
Read more
The Finishing Serum Haute Performance by Iles Formula is a weightless, heat-activated finishing treatment designed to smooth, strengthen and protect the hair while enhancing shine and manageability. It works across all hair types to refine the cuticle, control frizz and improve the look and feel of the hair without heaviness, making it ideal for both fine and coarse textures. A blend of lightweight botanical oils, including Marula, Argan, Macadamia and Pracaxi, replenishes essential lipids, seals the cuticle and boosts softness and luminosity while helping hair resist moisture loss and environmental stress. Tucumã Seed Butter further supports elasticity and smoothness, improving flexibility so hair feels stronger and more resilient rather than coated. Panthenol, Yacón Root Juice, and conditioning polymers bind moisture within the hair fiber and enhance slip, reducing friction and breakage during styling. Hydrolyzed silk and keratin amino acids reinforce weakened areas and refine the hair surface, while antioxidant vitamin E helps protect against oxidative damage. The result is hair that appears sleeker, glossier and organically fuller, with lasting smoothness, frizz control and heat-activated performance.
Read less

200ml

£50
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More Info

  • - + Who it is for
  • - + How to Apply
  • - + Ingredients
  • - + Smell & Texture
  • - + About the Brand
  • - + Who it is for
  • - + How to Apply
  • - + Ingredients
  • - + Smell & Texture
  • - + About the Brand
Who it is for
Green tick
For you if

Dry Hair

Damaged Hair

Coloured Hair

Chemically Treated Hair

Curly Hair

Dull Hair

Sensitive Scalp

Frizzy Hair

Oily Scalp

Hair Extensions

Red Cross
Not For you if

No Contraindications


Not sure? Consult an expert.

How to Apply
Apply evenly through the mid-lengths and ends before styling. For optimal results, activate with heat on wet hair. When distributed methodically section by section, this serum helps thin hair look and feel naturally fuller while smoothing and controlling thick, coarse hair. It can also be applied daily to dry hair to refresh protection, enhance smoothness and prevent frizz.
Ingredients

Water / Aqua / Eau, Coconut Alkanes, Sclerocarya Birreaa (Marula) Kernel Oil, Isohexadecane, Tetradecane, Propylene Carbonate, Panthenol, Argania Spinosa Kernel Oil, Macadamia Ternifolia Seed Oil, Pentaclethra Macroloba Seed Oil, Astrocaryum Tucuma Seed Butter, Polymnia Sonchifolia Root Juice, Hydrolyzed Silk, Guar Hydroxypropyltrimonium Chloride Polyquaternium-39, Hydroxyethylcellulose, Behentrimonium Methosulfate, Cetyl Alcohol, Coco-Caprylate / Caprate, Behenyl / Stearyl Aminopropanediol Esters, Keratin Amino Acids,
Quaternium-95, Propanediol, Benzoic Acid, Dehydroacetic Acid, Butylene Glycol, Tocopheryl Acetate, Citric Acid, PVP, Xanthan Gum, Fragrance (Parfum)

Please note: The ingredients listed in this product are subject to change as the formulation is updated. We aim to update the INCI list as soon as possible, but we encourage you to read the ingredient list on the product itself to ensure it's suitable for your personal use.

Smell & Texture

Smell: White flowers, fresh linen and soft, subtle French-style florals

Texture: Lightweight, silky oil-serum texture that feels smooth and fluid

About the Brand
Brand logo
Founded by celebrity hairstylist Wendy Iles, Iles Formula was created from decades of hands-on experience working with the world’s most demanding hair—on fashion runways, red carpets, and editorial sets. After years of witnessing hair damage caused by over-processing and harsh products, Wendy Iles set out to create a line of high-performance haircare that prioritizes hair integrity, strength, and longevity. The result is a tightly edited collection of luxury formulas that blend advanced cosmetic science with refined simplicity, earning a cult following among professionals and clients alike.

Iles Formula treats hair with the same precision and respect as fine couture, focusing on preserving the cuticle and strengthening the hair fiber at every step. Rather than masking damage, each formula is designed to protect against it—improving elasticity, reducing breakage, and maintaining optimal moisture balance. Highly concentrated yet lightweight, the products deliver multiple benefits in one step, supporting all hair types while remaining especially effective for color-treated, fragile, or chemically processed hair.

At the core of Iles Formula is a philosophy of intelligent formulation: gentle cleansing systems, silk proteins, targeted conditioning polymers, and nourishing botanical ingredients work in harmony to smooth, strengthen, and protect without build-up. Each product is carefully calibrated to respect the hair’s natural structure while enhancing shine, softness, and resilience. This disciplined, results-driven approach—paired with an elegant sensory experience—defines Iles Formula’s reputation for effortless luxury and visibly healthier hair.

The Benefits

  • - + Follicle Repair
  • - + Hydrating
  • - + Colour-Protecting
  • - + Nourishing
  • - + Repairing
  • - + Strengthening
  • - + Heat Protection
Follicle Repair

Hair follicle repair restores optimal growth and density by reactivating dormant follicles and balancing the hair growth cycle. Ageing, stress, and hormonal imbalances can shorten the anagen (growth) phase and prolong the telogen (resting) phase, leading to thinning. Repairing follicles involves stimulating dermal papilla cells, enhancing blood circulation, and supporting keratin synthesis to strengthen the hair’s structure. By reducing inflammation and oxidative stress, follicles regain their ability to produce thicker, stronger, and healthier hair over time.

Hydrating

Hydrating your hair means boosting its water content to ensure strands stay resilient, flexible, and healthy. Proper hydration is key to preserving the integrity of your hair's cuticle. When well-hydrated, the cuticle lies flat and smooth, creating a barrier against environmental damage and reducing friction between strands, which results in less tangling and a smoother texture. Heat styling, sun exposure, and harsh chemical treatments can strip your hair of its natural moisture. Using gentle haircare products designed to hydrate without weighing your hair down helps prevent dryness, brittleness, and breakage while enhancing shine and making your hair more manageable.

Colour-Protecting

Colour Protection in haircare is essential for maintaining vibrancy, strength, and long-term hair health, especially after colouring or chemical treatments. Daily exposure to UV rays, frequent washing, and thermal styling can break down pigments, weaken the cuticle, and leave hair dull and fragile.

This is where targeted colour-protecting care becomes critical. By shielding the hair from oxidative stress and helping the cuticle scales remain closed, it helps lock in colour and preserve luminosity. Hair stays radiant and reflective, while structural damage caused by treatments like bleaching is reduced. With consistent use, coloured hair looks brighter for longer, feels stronger, and is better protected against future fading and external aggressors.

Nourishing

Effective hair nourishment involves the restoration of the scalp’s barrier function, which plays a critical role in maintaining hydration and overall hair health. By enhancing barrier integrity, moisture is better retained and bioactive compounds are able to penetrate the hair cuticle, delivering deep nourishment to the cortex. This process contributes to structural reinforcement, improved elasticity, and greater resilience of the hair fibre.

Repairing

Damaged hair is typically identifiable by a rough, straw-like texture, increased difficulty in styling, and visible signs such as broken strands and split ends. These symptoms reflect underlying structural compromise within the hair fiber, often resulting from external aggressors such as chemical treatments, thermal styling, UV exposure, and mechanical stress.

Lipid Cement Deficiency occurs when the cuticle is exposed to aggressive treatments or environmental factors, and stripped of essential lipids, resulting in increased permeability. This loss compromises its barrier function, leaving the underlying cortex vulnerable to protein and lipid degradation.

Split Ends occur when the lipid distribution is uneven along the length of the hair shaft, with the ends being the most affected. The hair ends, being older and more frequently exposed to damaging elements, contain up to 30% less ceramide than the root, making the hair more prone to splitting and breakage.

Cuticle Scale Separation occurs when the lipid cement causes the scales to lift and disconnect, exposing the cortex and increasing transepidermal water loss (TEWL). This results in excessive dehydration, leaving the hair dry, brittle, and more susceptible to further damage.

Keratin Fiber Degradation occurs when the lipid and protein components weaken the keratin matrix, the hair loses tensile strength, flexibility, and resilience.

Loss of Shine occurs when the hair is damaged and exhibits irregularities and surface roughness due to disrupted scales and lipid loss. These irregular surfaces scatter light unevenly, leading to a dull, lackluster appearance.

Strengthening

Strengthening in haircare is all about restoring your hair's healthy structure and enhancing its resilience against damage, breakage, and the stresses of daily styling, such as heat exposure. Strengthening haircare products deliver essential components like proteins, hydration, and lipids that work together to reinforce hair strands. They support internal hair bonds, restore moisture, and coat the outer layer to protect and smooth, resulting in a shinier, smoother finish. By promoting a healthier hair structure, these products encourage faster hair growth and improve manageability.

Heat Protection

Heat Protection technology safeguards your hair from the damaging effects of styling tools like blow dryers and flat irons. By forming a protective barrier around each strand, it minimises direct heat exposure, reduces hydration loss, and prevents cuticle damage. This helps reduce the risk of dryness, brittleness, split ends, and breakage. These products also help maintain your hair colour, improve manageability, reduce frizz, and enhance shine, all contributing to healthier, more beautiful hair.

  • - + Follicle Repair
  • - + Hydrating
  • - + Colour-Protecting
  • - + Nourishing
  • - + Repairing
  • - + Strengthening
  • - + Heat Protection

Active Ingredients

  • - + Panthenol (Pro-Vitamin B5)
  • - + Silk Extract
  • - + Polyquaternium
  • - + Pracaxi Seed Oil
  • - + Yacon Root Juice
  • - + Tucumã Seed Butter
  • - + Marula Oil
  • - + Macadamia Seed Oil
  • - + Argan Oil
  • - + Keratin Amino Acids
Panthenol (Pro-Vitamin B5)

Panthenol, also known as pro-vitamin B5, is a stable form of Pantothenic Acid which penetrates the hair fiber and converts into vitamin B5 once applied. It acts as a humectant, attracting and binding moisture to the hair, which helps prevent dryness and brittleness while improving softness and elasticity. Inside the hair shaft, panthenol increases water content, giving hair a fuller, thicker feel and improving flexibility so strands are less likely to snap under stress. At the same time, it forms a lightweight, breathable film on the surface of the hair that smooths the cuticle, enhances shine and slip, reduces friction during washing and brushing, and helps protect against mechanical damage. On the scalp, it supports hydration and barrier function, contributing to overall hair health, making panthenol especially effective for reducing breakage and improving the look and feel of dry, damaged or chemically treated hair.

Silk Extract

Silk Extract is a protein that coats the hair shaft, enhancing smoothness and shine, whilst protecting against environmental stressors. It strengthens and conditions hair fibres, reducing breakage, resulting in softer, more manageable hair.

Polyquaternium

Polyquaternium is a lightweight, water-soluble conditioning polymer used in haircare to improve softness, manageability and frizz control without weighing hair down. It works by carrying a positive charge, which allows it to selectively bind to the negatively charged areas of the hair, especially damaged or porous sections, where it forms a thin, flexible conditioning film. This film smooths the hair cuticle, increases slip, reduces tangling and minimises friction during washing and brushing, helping to prevent breakage. Because it rinses cleanly and does not build up heavily, Polyquaternium leaves hair feeling soft, silky and conditioned while still light, making it suitable for fine, colour-treated and damaged hair types.

Pracaxi Seed Oil

Pracaxi Seed Oil is a nutrient-rich plant oil extracted from the seeds of the Amazonian Pracaxi tree, and is valued for its exceptional smoothing, strengthening and shine-enhancing properties. It is naturally high in behenic, oleic and linoleic fatty acids, which allow the oil to spread easily over the hair surface and penetrate the cuticle to replenish lost lipids. By restoring this lipid layer, Pracaxi seed oil helps seal the cuticle, reduce moisture loss and improve elasticity, making hair softer, more flexible and less prone to breakage. Its lightweight yet deeply conditioning nature also helps tame frizz, improve manageability and add gloss without leaving hair greasy, making it particularly effective for dry, damaged, textured or chemically treated hair.

Yacon Root Juice

Yacón Root Juice is a plant-derived extract and is used for its powerful humectant and conditioning properties. Naturally rich in fructooligosaccharides and sugars, it attracts and binds water to the hair and scalp, helping to maintain hydration and prevent dryness. By increasing moisture content within the hair fiber, Yacón root juice improves softness, flexibility and elasticity, which reduces brittleness and breakage. It also helps smooth the cuticle and enhance manageability, while supporting scalp comfort by maintaining hydration, making it especially beneficial for dry, fragile or stressed hair.

Tucumã Seed Butter

Tucumã Seed Butter is a richly nourishing plant butter extracted from the seeds of the Tucumã palm, native to the Amazon rainforest, and is prized for its ability to restore softness, strength and elasticity to dry or damaged hair. Naturally high in fatty acids such as lauric, oleic and linoleic acids, it works by replenishing the hair’s depleted lipid layer, which helps seal the cuticle, reduce moisture loss, and improve smoothness and shine. Its unique lipid profile allows it to soften and condition the hair fiber without excessive heaviness, improving flexibility so hair bends rather than breaks. By smoothing rough cuticles and reducing friction, it helps tame frizz, enhance manageability and protect hair from ongoing mechanical and environmental stress, making it especially beneficial for dry, brittle, textured or chemically treated hair.

Marula Oil

Marula Oil is a lightweight, nutrient-rich oil and is prized for its exceptional smoothing, softening and protective properties. Naturally high in oleic acid and antioxidants, it penetrates the hair fiber easily, helping to replenish lost lipids, improve elasticity and restore softness without weighing hair down. By reinforcing the hair’s lipid barrier, it helps seal the cuticle, reduce moisture loss and smooth rough, frizz-prone strands, which enhances shine and manageability. Its antioxidant content also helps protect hair from environmental stress and oxidative damage, making it especially beneficial for dry, damaged, colour-treated, or heat-stressed hair.

Macadamia Seed Oil

Macadamia Seed Oil is a lightweight, nutrient-rich plant oil, valued for its ability to deeply nourish, smooth and strengthen the hair without heaviness. It is naturally high in oleic and palmitoleic fatty acids, which closely resemble the lipids found in human sebum, allowing it to penetrate the hair fiber efficiently and replenish lost moisture. By restoring the hair’s lipid barrier, macadamia seed oil helps seal the cuticle, reduce moisture loss and improve elasticity, making hair softer, more flexible, and less prone to breakage. This cuticle-smoothing action also enhances shine, reduces frizz and improves overall manageability, making it especially beneficial for dry, damaged, coarse or chemically treated hair.

Argan Oil

Argan oil is a nourishing plant oil which is widely used for its ability to soften, strengthen and enhance shine. Rich in oleic and linoleic fatty acids, as well as vitamin E, it works by replenishing the hair’s natural lipid layer, which helps seal the cuticle, reduce moisture loss and smooth rough, damaged strands. This cuticle-smoothing action improves softness, manageability, and frizz control while enhancing natural gloss. At the same time, its antioxidant content helps protect the hair fiber from oxidative and environmental stress caused by UV exposure, pollution and heat styling, making argan oil especially effective for dry, brittle, color-treated or chemically processed hair.

Keratin Amino Acids

Keratin Amino Acids are low–molecular weight components derived from keratin, the primary structural protein of hair, and are used to help strengthen, repair and protect weakened strands. Because they are small and water-soluble, these amino acids can penetrate into damaged areas of the hair fiber, where they help support and reinforce the hair’s natural protein structure. By filling in micro-gaps and improving internal cohesion, keratin amino acids increase elasticity and tensile strength, making hair more resilient and less prone to breakage. At the same time, they help smooth the cuticle surface, improving softness, shine and manageability, while supporting hair’s ability to retain moisture and withstand mechanical and heat-related stress.

  • - + Panthenol (Pro-Vitamin B5)
  • - + Silk Extract
  • - + Polyquaternium
  • - + Pracaxi Seed Oil
  • - + Yacon Root Juice
  • - + Tucumã Seed Butter
  • - + Marula Oil
  • - + Macadamia Seed Oil
  • - + Argan Oil
  • - + Keratin Amino Acids

Spotlight

Damaged Hair

Dry and damaged hair occurs when the hair’s natural protective barrier is weakened, allowing moisture to escape and leaving the inner structure exposed to breakage and rough texture. This damage develops through a combination of external and internal factors. Heat styling tools lift and crack the cuticle, while chemical processes such as colouring, bleaching, or relaxing break down protein bonds and strip away essential lipids. Environmental stressors like sun exposure, pollution, wind, hard water, and salt or chlorinated water further dry and erode the hair surface. Internally, genetics, aging, hormonal changes, dehydration, and poor nutrition can reduce the scalp’s natural oil production, making hair more prone to dryness and fragility, especially through the lengths and ends. As the cuticle becomes rough and uneven, hair loses its ability to retain moisture, leading to dullness, frizz, tangling, split ends, and increased breakage. Repairing dry and damaged hair requires a gentle, consistent approach focused on restoring moisture, lipids, and strength. Mild, sulfate-free cleansing helps prevent further stripping, while humectants rehydrate the hair fiber and improve flexibility. Nourishing conditioners and oils replenish lost lipids, smooth the cuticle, and seal in moisture, improving softness and shine. Reducing heat, protecting hair during styling, and minimizing mechanical stress are equally important. With ongoing, targeted care, damaged hair can gradually regain resilience, manageability, and a healthier appearance.

Why I love it

  • "Iles Formula treats hair like fine fabric; focusing on preserving the cuticle, strengthening the fiber and preventing damage before it starts. Loved by hairstylists and clients alike, Iles Formula delivers visible improvement in hair strength, shine, and breakage reduction, making it as results-focused as it is indulgent."

    X Natalie K-F

    Founder, Embassy of Beauty

  • Iles Formula

    Finishing Serum Haute Performance

    £50

    The Finishing Serum Haute Performance by Iles Formula is a weightless, heat-activated finishing treatment designed to smooth, strengthen and protect the hair while enhancing shine and manageability. It works across all hair types to refine the cuticle, control frizz and improve the look and feel of the hair without heaviness, making it ideal for both fine and coarse textures.

    A blend of lightweight botanical oils, including Marula, Argan, Macadamia and Pracaxi, replenishes essential lipids, seals the cuticle and boosts softness and luminosity while helping hair resist moisture loss and environmental stress. Tucumã Seed Butter further supports elasticity and smoothness, improving flexibility so hair feels stronger and more resilient rather than coated.

    Panthenol, Yacón Root Juice, and conditioning polymers bind moisture within the hair fiber and enhance slip, reducing friction and breakage during styling. Hydrolyzed silk and keratin amino acids reinforce weakened areas and refine the hair surface, while antioxidant vitamin E helps protect against oxidative damage. The result is hair that appears sleeker, glossier and organically fuller, with lasting smoothness, frizz control and heat-activated performance.

    View product