Schwarzkopf Professional Bonacure Color Freeze Conditioner pH 4.5

DESCRIPTION

What It Does: Absorbs or reflects uv radiation, preventing uv-induced dna damage, photo-oxidative stress, and premature skin aging.

Why It's Used: Uv filters are the active ingredients in sun protection — without them, formulations cannot make spf claims or prevent solar-induced skin damage.

How It Works: The uv-absorbing chromophore undergoes photoexcitation by uv photons, then dissipates the absorbed energy through thermal relaxation (chemical filters) or photon scattering/reflection (physical filters), preventing photon penetration to skin cells.

Typically Found In: Sunscreens,moisturizers with spf,foundations with spf

TECHNICAL DETAILS

Primary Category: Uv filters

Secondary Functions: Skin-protecting

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.5–25% (within regulatory limits)

SOURCING & ETHICS

Vegan Status: Yes

Halal Status: Yes

Source Notes: Synthetic uv filter; no animal components.

SKIN COMPATIBILITY

Irritancy Rating: 1

Comedogenicity Rating: 0

Sensitivity Concerns: Contact allergy to uv filters occurs in approximately 1–3% of the general population; patch testing recommended for those with known photosensitivity.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Regulatory approval required per market (eu annex vi, fda otc monograph, etc.). generally non-irritating at approved concentrations.

Works Well With: Other uv filters,antioxidants,emollients

Avoid Combining With: Incompatible filter combinations (photodegradation); check regulatory approvals per region

SCIENTIFIC NOTE

Uv filters operate through two mechanisms: organic/chemical filters absorb uv photons through electronic excitation (π→π* transitions in conjugated systems), then dissipate energy via thermal relaxation; inorganic/physical filters (tio2, zno) scatter and reflect photons through mie scattering (particle size 50–300 nm) and band gap absorption. spf is measured in vivo (iso 24444) as the ratio of minimal erythema doses with and without sunscreen.

Last Verified: Cosing eu database; pcpc cosmetic ingredient safety reviews; eu cosmetics regulation annex vi; iso 24444 (in vivo spf testing)

Primary Sources: 2025-01-15

DESCRIPTION

What It Does: Absorbs or reflects uv radiation, preventing uv-induced dna damage, photo-oxidative stress, and premature skin aging.

Why It's Used: Uv filters are the active ingredients in sun protection — without them, formulations cannot make spf claims or prevent solar-induced skin damage.

How It Works: The uv-absorbing chromophore undergoes photoexcitation by uv photons, then dissipates the absorbed energy through thermal relaxation (chemical filters) or photon scattering/reflection (physical filters), preventing photon penetration to skin cells.

Typically Found In: Sunscreens,moisturizers with spf,foundations with spf

TECHNICAL DETAILS

Primary Category: Uv filters

Secondary Functions: Skin-protecting

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.5–25% (within regulatory limits)

SOURCING & ETHICS

Vegan Status: Yes

Halal Status: Yes

Source Notes: Synthetic uv filter; no animal components.

SKIN COMPATIBILITY

Irritancy Rating: 1

Comedogenicity Rating: 0

Sensitivity Concerns: Contact allergy to uv filters occurs in approximately 1–3% of the general population; patch testing recommended for those with known photosensitivity.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Regulatory approval required per market (eu annex vi, fda otc monograph, etc.). generally non-irritating at approved concentrations.

Works Well With: Other uv filters,antioxidants,emollients

Avoid Combining With: Incompatible filter combinations (photodegradation); check regulatory approvals per region

SCIENTIFIC NOTE

Uv filters operate through two mechanisms: organic/chemical filters absorb uv photons through electronic excitation (π→π* transitions in conjugated systems), then dissipate energy via thermal relaxation; inorganic/physical filters (tio2, zno) scatter and reflect photons through mie scattering (particle size 50–300 nm) and band gap absorption. spf is measured in vivo (iso 24444) as the ratio of minimal erythema doses with and without sunscreen.

Last Verified: Cosing eu database; pcpc cosmetic ingredient safety reviews; eu cosmetics regulation annex vi; iso 24444 (in vivo spf testing)

Primary Sources: 2025-01-15

DESCRIPTION

What It Does: Repairs hair structure by penetrating and rebonding with damaged hair keratin proteins.

Why It's Used: The authentic hair repair ingredient – same protein composition as hair itself, providing structural repair from within the cortex rather than surface coating alone.

How It Works: Hydrolyzed keratin peptides (500-2000 da) penetrate cuticle and cortex. cysteine thiol groups form disulfide bonds with oxidized keratin (rebonding). cross-links damaged cortex protein for improved tensile strength and reduced breakage. surface film formation fills cuticle gaps.

Typically Found In: Damage repair conditioners,hair masks,professional treatments

TECHNICAL DETAILS

Primary Category: Active ingredient – keratin peptide

Secondary Functions: Skin conditioning

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 0.5%–10%

SOURCING & ETHICS

Vegan Status: Conditional – from wool (ovis aries) keratin; plant alternatives limited

Halal Status: Conditional – wool source; verify halal certification

Source Notes: From hydrolyzed wool or feather keratin. plant-based (wheat keratin analog) available but different amino acid profile. marine keratin from squid pen also available.

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

Hair keratin is unique in its high cysteine content (~14%) forming extensive disulfide bond crosslinks. these disulfide bonds are disrupted by bleaching, heat, and chemical processing. hydrolyzed keratin's cysteine groups physically rebond into these disrupted sites – a structural repair mechanism specific to keratin chemistry not achievable with any other protein hydrolysate.

Last Verified: Cosing database,robbins hair science,cir safety assessment

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Exfoliates dead skin cells, attracts and retains moisture, brightens skin tone, and improves texture.

Why It's Used: Dual exfoliant and humectant – uniquely hydrating vs other ahas. gentler and suitable for normal-to-sensitive skin.

How It Works: Disrupts desmosomes to promote exfoliation at low ph. acts as humectant. also stimulates ceramide synthesis at lower concentrations for barrier support.

Typically Found In: Chemical exfoliants,toners,serums,professional peels

TECHNICAL DETAILS

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

Secondary Functions: Humectant,brightening,barrier support,ceramide synthesis

Application Areas:

Facial Skincare

Body Care

Hair Care

Beard Care

Color Cosmetics (Makeup)

Dietary/Oral Supplements

Typical Concentration Range: 2%–10% (daily); 20%–90% (professional); active at ph ≤3.9

SOURCING & ETHICS

Vegan Status: Yes – synthetic or fermentation-derived

Halal Status: Yes

Source Notes: Fermentation-derived from carbohydrates or synthetically produced. both l-form and dl-form used.

SKIN COMPATIBILITY

Irritancy Rating: 2/5 – low to moderate

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Photosensitizing – spf required. better tolerated than glycolic acid for most skin types.

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

Lactic acid's role as a natural moisturizing factor (nmf) component makes it uniquely hydrating among ahas. ceramide synthesis stimulation at 2% provides barrier benefits complementing exfoliating activity.

Last Verified: Cosing database,stiller et al. lactic acid review,sccs aha opinion

Primary Sources: 2026-03-12

DESCRIPTION

What It Does: Provides documented functional activity from quaternium-87.

Why It's Used: Quaternium-87 contributes established cosmetic function from its characteristic chemical structure and physicochemical properties.

How It Works: Chemical structure provides documented cosmetic function. safety: established in cosmetic science literature and regulatory review. use: standard cosmetic concentrations.

Typically Found In: Skin care formulations

TECHNICAL DETAILS

Primary Category: Active ingredient – cosmetic active

Secondary Functions: Skin conditioning

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: Conditional

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

Quaternium-87 provides documented cosmetic activity through its characteristic mechanism. established in cosmetic science literature with regulatory review supporting safety at standard formulation concentrations.

Last Verified: Cosing database,quaternium-87 technical literature

Primary Sources: 2026-03-12