Unlocks exact minute-by-minute pH buffer wait times, 4-night skin-cycling calendar & barrier-safe swaps

Routine Safety Score
62/100
1 Critical Conflict
Max pH Shock (ΔpH)
2.4 pH
Threshold > 1.8
500-Dalton Penetration
84% Pass
MW <= 500 Da Rule
Malassezia / Fungal
0 Triggers
Ester-Free Verified
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LOW_PH_ACTIVE · HARMONY SCORE 64/100 · ΔpH 1.9
Shop Verified Formula at Dermstore ↗ Shop Barrier-Safe Alternative at Sephora ↗

The Ordinary AHA 30% + BHA 2% Peeling Solution INCI & Chemical Burn Prevention Matrix

10-minute 30% AHA + 2% BHA rinse-off chemical peel. Never combine with any leave-on acid, retinoid, or benzoyl peroxide on the same night.

FORMULATION CHEMISTRY
30% Glycolic/Lactic/Tartaric/Citric AHA + 2% Salicylic Acid at pH 3.6. Never apply on wet skin, never exceed 10 minutes, and never follow with retinoids or acids.

Recommended Spacing: 15 Minutes

AM MORNING GLOW RITUAL

Apply in the AM only if paired with broad-spectrum SPF 30–50+ and separated from antagonistic pH/redox actives.

PM BARRIER REPAIR RITUAL

In the PM, 30% Glycolic/Lactic/Tartaric/Citric AHA + 2% Salicylic Acid at pH 3.6. Never apply on wet skin, never exceed 10 minutes, and never follow with retinoids or acids.

1. Tap a Curated Vanity Shelf Preset COSMETIC CHEMIST ΔpH ENGINE
Critical Chemical / ΔpH Inactivation Detected Analyzed in 0.59ms
Routine Harmony
5/100
Barrier Stress
98/100
Pore-Clog Load
60/100
Silk pH Spectrum (pH 2.0 Direct Acids → pH 5.5 Skin Mantle → pH 8.0) |ΔpH| > 1.8 = Peptide / Flush Alert
Glycolic · pH 3.6 Lactic · pH 3.6 Tartaric · pH 3.6 Citric · pH 3.6 Salicylic · pH 3.6
CRITICAL · ΔpH 2.2 Glycolic Acid (pH 3.6) × Tretinoin (pH 5.8)
Synergistic Corneodesmosome Stripping & ΔpH 2.2 Retinoid Stress

Layering low-pH keratolytic acids (pH 3.0–3.8) with nuclear retinoids strips the stratum corneum barrier, accelerates acid-catalyzed retinoid degradation, and causes severe retinoid dermatitis.

Esthetician Fix: Follow the 4-Night Skin Cycling Protocol: Night 1 Exfoliating Acid, Night 2 Retinoid, Nights 3–4 Ceramide Barrier Recovery.
Shop Barrier-Safe Alternative (Dermstore / Sephora) ↗
CRITICAL · ΔpH 2.2 Lactic Acid (pH 3.6) × Tretinoin (pH 5.8)
Synergistic Corneodesmosome Stripping & ΔpH 2.2 Retinoid Stress

Layering low-pH keratolytic acids (pH 3.0–3.8) with nuclear retinoids strips the stratum corneum barrier, accelerates acid-catalyzed retinoid degradation, and causes severe retinoid dermatitis.

Esthetician Fix: Follow the 4-Night Skin Cycling Protocol: Night 1 Exfoliating Acid, Night 2 Retinoid, Nights 3–4 Ceramide Barrier Recovery.
Shop Barrier-Safe Alternative (Dermstore / Sephora) ↗
CRITICAL · ΔpH 2.2 Tartaric Acid (pH 3.6) × Tretinoin (pH 5.8)
Synergistic Corneodesmosome Stripping & ΔpH 2.2 Retinoid Stress

Layering low-pH keratolytic acids (pH 3.0–3.8) with nuclear retinoids strips the stratum corneum barrier, accelerates acid-catalyzed retinoid degradation, and causes severe retinoid dermatitis.

Esthetician Fix: Follow the 4-Night Skin Cycling Protocol: Night 1 Exfoliating Acid, Night 2 Retinoid, Nights 3–4 Ceramide Barrier Recovery.
Shop Barrier-Safe Alternative (Dermstore / Sephora) ↗
+ View 1 additional secondary ingredient interaction(s)
CRITICAL · ΔpH 2.2 Salicylic Acid (pH 3.6) × Tretinoin (pH 5.8)
Synergistic Corneodesmosome Stripping & ΔpH 2.2 Retinoid Stress

Layering low-pH keratolytic acids (pH 3.0–3.8) with nuclear retinoids strips the stratum corneum barrier, accelerates acid-catalyzed retinoid degradation, and causes severe retinoid dermatitis.

Esthetician Fix: Follow the 4-Night Skin Cycling Protocol: Night 1 Exfoliating Acid, Night 2 Retinoid, Nights 3–4 Ceramide Barrier Recovery.
Shop Barrier-Safe Alternative (Dermstore / Sephora) ↗
Isopropyl Myristate (5/5 Pore Risk)Cetearyl Alcohol (2/5 Pore Risk) Fungal-Acne Trigger: Isopropyl Myristate
AM Morning Glow & PM 4-Night Barrier Ritual
  • AM Prep: pH 5.5 Gentle Amino-Acid Cleanser or Water Rinse [pH 5.5 · Pat dry]
  • AM Barrier + Photoprotection: Physiological Ceramide Moisturizer + Broad-Spectrum SPF 50+ PA++++ [pH 5.8 · Mandatory final step]
Night 1 · Keratolytic Resurfacing ACTIVE ACID NIGHT
pH 5.5 Cleanser (Dry completely) → Direct AHA / BHA Exfoliant (pH 3.2–3.6) · ⏱ Wait 15 min → 3:1:1 Ceramide + Cholesterol Recovery Cream
Night 2 · Cellular Turnover (Retinoid) RETINOID NIGHT
pH 5.5 Cleanser + Snail Mucin / Humectant Buffer (⏱ Dry 15 min) → Pea-sized Rx Tretinoin / Retinaldehyde / Retinol (pH 5.8) → Encapsulated Ceramide Barrier Cream (Sandwich Method)
Night 3 · Peptide & Microbiome Repair PEPTIDE & CICA RECOVERY
pH 5.5 Cleanser + Heartleaf / Centella Toner → Niacinamide 4%–10% + Snail 96 Mucin Essence → Dieux Instant Angel / Aestura Atobarrier 365 Cream
Night 4 · Deep Lamellar Lipid Restoration 100% BARRIER REST
Micellar Water + pH 5.5 Cleanser → Panthenol 5% + Madecassoside + Squalane → La Roche-Posay Cicaplast Baume B5+ or Ceramide Cream
Verified Barrier-Safe Finishers (3:1:1 Ceramide & SPF 50+) Shop Verified Ritual Kit (Sephora / Dermstore) ↗
dermlogic ritual pass 9:16 WALLET
5/100
4 Active Clash(es) · Barrier Stress 98%
AM MORNING GLOW
Prep → Barrier + Photoprotection
PM 4-NIGHT SKIN CYCLING
N1: Exfoliate · N2: Retinoid · N3: Peptide Glaze · N4: Ceramide

Esthetician & Cosmetic Chemist FAQ

What is the formulation pH and full INCI profile of The Ordinary AHA 30% + BHA 2% Peeling Solution?

The Ordinary AHA 30% + BHA 2% Peeling Solution is formulated at pH 3.6 ($9). Full INCI: Glycolic Acid, Aqua (Water), Aloe Barbadensis Leaf Water, Sodium Hydroxide, Daucus Carota Sativa Extract, Propanediol, Cocamidopropyl Dimethylamine, Salicylic Acid, Lactic Acid, Tartaric Acid, Citric Acid, Panthenol, Sodium Hyaluronate Crosspolymer.

Which skincare actives conflict with The Ordinary AHA 30% + BHA 2% Peeling Solution?

30% Glycolic/Lactic/Tartaric/Citric AHA + 2% Salicylic Acid at pH 3.6. Never apply on wet skin, never exceed 10 minutes, and never follow with retinoids or acids.

Is The Ordinary AHA 30% + BHA 2% Peeling Solution comedogenic or fungal-acne (Malassezia) safe?

Run the pre-loaded INCI analyzer above to inspect positional comedogenicity (0–5) and C12–C24 Malassezia lipid ester triggers for every ingredient in AHA 30% + BHA 2% Peeling Solution.

Related Skincare Layering Guides

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Beauty of Joseon Relief Sun SPF50+ PA++++ INCI Teardown: UV Filters, Niacinamide & Ferments
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Biologique Recherche Lotion P50 1970 INCI & Conflict Matrix: pH 3.0 Multi-Acid Rules
CLINICAL_TEARDOWN · ΔpH 0.3
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🚀 Open-Source Engine Upgrade: rdkit/rdkit (500-Dalton Cheminformatics Rule) (★ 3,622) Inspect Live JSON Telemetry ↗

Bos & Meinardi 500-Dalton Molecular Weight & LogP Lipophilicity Layering Sorter

Computes exact Dalton molecular weight (MW <= 500 Da trans-epidermal active vs MW > 500 Da surface occlusive film) and sorts your routine from thinnest low-pH aqueous serum to high-MW barrier seal.

Loading live rdkit/rdkit (500-Dalton Cheminformatics Rule) deterministic readout...

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