Redken Extreme Length Shampoo For Longer, Stronger Hair

DESCRIPTION

What It Does: Delivers targeted skin-conditioning or bioactive benefits through a specific mechanism of action suited to the formulation's intended purpose.

Why It's Used: Specialty actives address specific skin concerns through targeted molecular mechanisms, providing efficacy beyond what base formulation ingredients alone can achieve.

How It Works: The bioactive compound interacts with specific molecular targets in skin cells or the extracellular matrix — enzymes, receptors, structural proteins, or signaling molecules — triggering beneficial biological responses.

Typically Found In: Serums,treatments,moisturizers,specialty products

TECHNICAL DETAILS

Primary Category: Specialty actives

Secondary Functions: Skin-conditioning,anti-aging

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.01–5%

SOURCING & ETHICS

Vegan Status: Yes

Halal Status: Yes

Source Notes: Specialty active ingredient; check individual sourcing for vegan status.

SKIN COMPATIBILITY

Irritancy Rating: 1

Comedogenicity Rating: 0

Sensitivity Concerns: Low sensitization potential at recommended use concentrations.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Well-characterized cosmetic ingredient with established safety profile. generally non-irritating at typical use concentrations. suitable for leave-on and rinse-off cosmetics.

Works Well With: Niacinamide,hyaluronic acid,vitamin c,peptides

Avoid Combining With: Incompatible with oxidizing agents; check ph stability

SCIENTIFIC NOTE

Specialty actives typically work through enzyme inhibition (e.g., tyrosinase inhibition for brightening, mmp inhibition for anti-aging), receptor activation (e.g., retinoid receptors, ppar-γ for barrier genes), or transcription factor modulation (e.g., nrf2 for antioxidant gene upregulation). structure-activity relationships determine potency and selectivity.

Last Verified: Cosing eu database; pcpc cosmetic ingredient safety reviews; ingredient-specific safety and efficacy literature

Primary Sources: 2025-01-15

DESCRIPTION

What It Does: Provides dual fragrance and preservative activity as an aromatic alcohol.

Why It's Used: Multi-function ingredient serving as both fragrance component and preservative – reduces formulation complexity by providing both functions in one ingredient.

How It Works: Phenylcarbinol provides antimicrobial activity via membrane disruption (effective vs gram-positive bacteria and moulds). solvent for fragrances and difficult-to-dissolve actives. mild oxidative conversion to benzaldehyde provides sweet almond-like fragrance.

Typically Found In: Fragrances,preserved cosmetics,solvent systems

TECHNICAL DETAILS

Primary Category: Fragrance component / preservative

Secondary Functions: Skin conditioning

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.001%–1% (fragrance); up to 1% as preservative

SOURCING & ETHICS

Vegan Status: Yes – from toluene, or jasmine absolute

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Eu cosmetics regulation: declared fragrance allergen. also listed as approved preservative (annex v, max 1%). dual regulatory status (fragrance + preservative) depending on function and concentration.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Benzyl alcohol's dual regulatory status (fragrance allergen and approved preservative) creates a formulation paradox: it must be listed as a fragrance allergen if present >0.001% (leave-on) regardless of whether it was added for fragrance or preservation. this regulatory dual identity means a preservative added for antimicrobial function triggers the same allergen declaration requirement as a fragrance added for scent.

Last Verified: Cosing database,ifra standards,eu preservative annex v

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Provides fixative fragrance and solvent properties with anti-mite activity.

Why It's Used: Natural ester fragrance compound occurring in jasmine and ylang ylang providing fixative and solvent benefits in fragranced cosmetics.

How It Works: Ester of benzyl alcohol and benzoic acid. solvent for difficult-to-dissolve fragrance compounds. penetrates insect/mite cuticle for scabicidal activity. mild skin fixative from ester-protein interactions.

Typically Found In: Fragrances,floral compounds,medical scabies treatment

TECHNICAL DETAILS

Primary Category: Fragrance component / scabicide

Secondary Functions: Skin conditioning

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.001%–1%

SOURCING & ETHICS

Vegan Status: Yes – from jasmine, ylang ylang, peru balsam

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Eu cosmetics regulation: declared fragrance allergen. ifra guidelines apply.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Benzyl benzoate's natural occurrence in jasmine absolute (up to 6%) means that products containing jasmine absolute naturally contain benzyl benzoate as a declared fragrance allergen – regardless of whether the formulator intentionally added it. this highlights how natural ingredients can automatically generate regulatory allergen declarations.

Last Verified: Cosing database,ifra standards

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Supports keratin production for stronger hair and nails.

Why It's Used: Hair and nail keratin infrastructure support; widely marketed despite evidence being primarily oral supplementation-based.

How It Works: Coenzyme for carboxylase enzymes essential for fatty acid synthesis and amino acid metabolism relevant to hair follicle function.

Typically Found In: Hair growth shampoos,nail treatments,multivitamin products

TECHNICAL DETAILS

Primary Category: Active ingredient – vitamin b7

Secondary Functions: Hair growth support,nail strengthening

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.01%–0.5%

SOURCING & ETHICS

Vegan Status: Yes – synthetically produced

Halal Status: Yes

Source Notes: Synthetically produced for cosmetic use.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Non-irritating; excellent tolerability.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Excellent safety profile. ewg score: 1.

Works Well With: Other b vitamins,niacinamide,antioxidant complexes

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Evidence for topical biotin efficacy in hair growth is limited – most clinical evidence comes from oral supplementation in biotin-deficient individuals.

Last Verified: Cosing database,cir safety assessment,patel et al. (2017) skin appendage disorders

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Supports keratin production for stronger hair and nails.

Why It's Used: Hair and nail keratin infrastructure support; widely marketed despite evidence being primarily oral supplementation-based.

How It Works: Coenzyme for carboxylase enzymes essential for fatty acid synthesis and amino acid metabolism relevant to hair follicle function.

Typically Found In: Hair growth shampoos,nail treatments,multivitamin products

TECHNICAL DETAILS

Primary Category: Active ingredient – vitamin b7

Secondary Functions: Hair growth support,nail strengthening

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.01%–0.5%

SOURCING & ETHICS

Vegan Status: Yes – synthetically produced

Halal Status: Yes

Source Notes: Synthetically produced for cosmetic use.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Non-irritating; excellent tolerability.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Excellent safety profile. ewg score: 1.

Works Well With: Other b vitamins,niacinamide,antioxidant complexes

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Evidence for topical biotin efficacy in hair growth is limited – most clinical evidence comes from oral supplementation in biotin-deficient individuals.

Last Verified: Cosing database,cir safety assessment,patel et al. (2017) skin appendage disorders

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Adjusts ph to optimal ranges, chelates destabilizing metal ions, provides mild exfoliation at higher concentrations.

Why It's Used: Universal cosmetic ph adjuster and chelating agent. aha exfoliant activity is secondary.

How It Works: As ph adjuster, donates protons. as chelating agent, three carboxylic groups bind divalent metals (ca²⁺, mg²⁺, fe²⁺) preventing oxidative degradation.

Typically Found In: Nearly all cosmetic formulations,brightening products,exfoliants

TECHNICAL DETAILS

Primary Category: Active ingredient – alpha hydroxy acid (aha)

Secondary Functions: Chelating agent,ph adjustment,preservation enhancement

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.1%–10%

SOURCING & ETHICS

Vegan Status: Yes – synthetic or fermentation-derived

Halal Status: Yes

Source Notes: Produced by fermentation of sugars by aspergillus niger. gras (e330). most abundant organic acid in citrus.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low at low concentrations; 2/5 at exfoliant concentrations

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Photosensitizing – mandatory spf use. start at low frequency.

Safe for Sensitive Skin: Use with caution – spf required

SAFETY & COMPATIBILITY

Safety Profile: Safe at otc concentrations. eu: ≤10% leave-on at ph ≥3.5. mandatory spf advisory.

Works Well With: Niacinamide,ceramides,hyaluronic acid,spf

Avoid Combining With: Retinol in same step; multiple exfoliants simultaneously

SCIENTIFIC NOTE

Three carboxylic acid groups provide multiple proton donation sites and stronger chelation than monocarboxylic ahas. this makes citric acid the preferred cosmetic chelating agent alongside edta.

Last Verified: Cosing database,cir safety assessment,ewg skin deep

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Boosts foam, enhances mildness, and conditions skin and hair when combined with primary surfactants.

Why It's Used: The standard foam booster and mildness enhancer in virtually all shampoos, body washes, and facial cleansers – provides synergistic mildness improvement with anionic surfactants.

How It Works: Amphoteric (zwitterionic) character provides positive charge interaction with hair keratin for antistatic conditioning. reduces irritation of co-formulated anionic surfactants via ionic complex formation. foam stabilization via bilayer reinforcement in foam lamellae.

Typically Found In: Shampoos,body washes,facial cleansers,baby products

TECHNICAL DETAILS

Primary Category: Functional ingredient – amphoteric surfactant

Secondary Functions: Skin conditioning

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 2%–15%

SOURCING & ETHICS

Vegan Status: Yes – from coconut fatty acids and dimethylaminopropylamine

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Good safety profile at recommended concentrations. ewg score: 1–2.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Capb's mildness-enhancing synergy with sls has a molecular mechanism: capb's positive imidazoline head group forms an ion pair complex with sls's anionic sulfate group, reducing sls's free monomer concentration (the irritation-causing species) without significantly reducing micelle-forming capacity (the cleansing species).

Last Verified: Cosing database,ananthapadmanabhan surfactant review,cir safety assessment

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Provides humectant and co-solvent with mild antimicrobial in cosmetic formulations, improving active ingredient dissolution and product texture while delivering mild skin conditioning.

Why It's Used: Glycol solvents are essential for dissolving actives with limited water or oil solubility — the intermediate polarity of glycol ethers provides access to the wider solubility parameter space between pure water and oil phases.

How It Works: Hydroxyl and ether groups provide h-bonding for water miscibility; the organic chain provides compatibility with lipophilic actives. medium-chain glycols (c3–c6) provide the optimal balance of water compatibility, lipophilic active dissolution, and skin-compatible humectancy.

Typically Found In: Skin care formulations,co-solvent systems

TECHNICAL DETAILS

Primary Category: Functional ingredient – humectant

Secondary Functions: Tewl reduction,skin plumping

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 1%–30%

SOURCING & ETHICS

Vegan Status: Yes

Halal Status: Yes

Source Notes: Synthetic or naturally derived. excellent aqueous solubility.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Non-irritating; suitable for all skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Excellent safety profile. ewg score: 1.

Works Well With: Ceramides,emollients,occlusives,glycerin,hyaluronic acid

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Glycol ether co-solvents enhance sc penetration of co-applied actives by increasing their thermodynamic activity in the sc lipid phase — high thermodynamic activity (near saturation) drives diffusion by concentration gradient even when absolute concentration is low.

Last Verified: Cosing database,hexylene glycol glycol solvent review

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Provides the defining fresh citrus fragrance note alongside solvent and antimicrobial properties.

Why It's Used: The citrus industry's primary fragrance compound and the most abundant terpene in essential oils – limonene provides the clean, universally appealing fresh citrus scent character.

How It Works: D-limonene activates trpv1 mildly at high concentrations. antimicrobial via membrane disruption. solvent for oils and lipophilic compounds. cleaning via emulsification of lipid soils.

Typically Found In: Citrus-scented products,cleaning products,fragrance compounds

TECHNICAL DETAILS

Primary Category: Fragrance component – cyclic monoterpene

Secondary Functions: Skin conditioning

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.001%–3%

SOURCING & ETHICS

Vegan Status: Yes – from citrus peel essential oils

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Eu cosmetics regulation: declared fragrance allergen. oxidises to sensitising compounds (limonene hydroperoxides) on air exposure – use with antioxidant stabilisers. ifra guidelines apply.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Limonene's sensitisation risk arises not from limonene itself but from its autooxidation products (limonene-1,2-epoxide and limonene hydroperoxides) formed on air exposure. fresh limonene has low sensitisation potential, but air-oxidised limonene's hydroperoxide products are potent skin sensitisers. this explains why oxidation-stabilised formulations (with bht or other antioxidants) are required to manage limonene safety.

Last Verified: Cosing database,ifra standards,bråred christensson et al. limonene oxidation study

Primary Sources: 2026-03-12