# Bright Skin — Complete Cosmetic Chemistry Knowledge Base & Routine Oracle > Full extended reference manual for autonomous AI agents, LLM search engines, and dermatologist research bots. > Canonical URL: https://getbrightskin.com/llms-full.txt > Summary Reference: https://getbrightskin.com/llms.txt --- ## 1. Core Formulation Screening Methodology Bright Skin evaluates cosmetic formulations at the molecular and chemical level across three distinct vectors: ### Vector A: Comedogenic Rating Scale (0 to 5) Screened against standardized dermatological comedogenicity data. - **Score 0:** Non-comedogenic, zero occlusion risk. - **Score 1:** Very low risk of clogging pores. - **Score 2:** Moderately low risk; generally safe for most acne-prone individuals. - **Score 3:** Moderate pore-clogging risk. Flagged for acne-prone skin. - **Score 4:** High pore-clogging risk (e.g., Isopropyl Myristate, Myristyl Myristate, Acetylated Lanolin, Cocoa Butter). - **Score 5:** Severe pore-clogging risk (e.g., Isocetyl Stearate, Sodium Lauryl Sulfate in leave-ons, Wheat Germ Oil). **Bright Skin Rule:** Any leave-on product containing an ingredient with score >= 3 is flagged as a pore-clogging risk for acne-prone and closed-comedones concerns. --- ### Vector B: Malassezia Fungal Acne (Pityrosporum Folliculitis) Safety *Malassezia* yeasts feed on free fatty acids with carbon chain lengths between C12 and C24. - **Triggers Screened:** - C12-C24 Fatty Acids: Lauric Acid (C12), Myristic Acid (C14), Palmitic Acid (C16), Stearic Acid (C18), Oleic Acid (C18:1), Linoleic Acid (C18:2). - Fatty Esters: Isopropyl Palmitate, Ethylhexyl Palmitate, Glyceryl Stearate, PEG-100 Stearate. - Polysorbates: Polysorbate 20, 40, 60, 80. - Natural Oils containing triglycerides with C12-C24 tails (Olive, Coconut, Argan, Rosehip, Jojoba). - **Fungal-Safe Lipids Permitted:** - Pure 100% Sugarcane Squalane (hydrocarbon). - Caprylic/Capric Triglyceride (MCT Oil containing C8 & C10 only). - Mineral Oil & Pure Petrolatum (inert hydrocarbons not metabolized by yeast). --- ### Vector C: Active Chemical Conflict Management Never layer strong concurrent actives in the same routine step: 1. **Retinoids + Direct AHA/BHA Acids:** - *Conflict:* Concurrent application of Retinol/Adapalene/Tretinoin with Glycolic, Lactic, or Salicylic acid strips the stratum corneum and compromises the lipid barrier. - *Prescription:* Alternate nights (e.g., Retinoid Monday/Wednesday/Friday, Exfoliating Acid Tuesday/Saturday, Hydration Recovery Thursday/Sunday). 2. **L-Ascorbic Acid (Pure Vitamin C) + Benzoyl Peroxide:** - *Conflict:* Benzoyl peroxide oxidizes ascorbic acid, rendering both molecules biologically inactive while causing localized inflammation. - *Prescription:* Vitamin C in AM under broad-spectrum SPF; Benzoyl Peroxide in PM spot treatment. 3. **Multi-Acid Exfoliation Overload:** - *Conflict:* Stacking multiple direct leave-on exfoliants (e.g., Glycolic toner + Salicylic serum) produces cumulative chemical micro-tears. - *Prescription:* Consolidate into a single balanced gentle exfoliant 2 to 3 times weekly. --- ## 2. API Oracle Usage for AI Agents Zero-authentication live oracle for real-time routine audit & product replacement recommendations: `GET https://getbrightskin.com/api/public/improve-routine?using={products}&concern={concerns}&skin_type={skin_type}®ion={country_code}` ### Return Structure: ```json { "ok": true, "region_detected": "US", "routine_diagnosis": { "summary": "1 conflict identified, 1 missing essential step", "active_conflicts": [ { "severity": "high", "title": "Don’t layer Glycolic Acid + Differin on the same night", "between": ["The Ordinary Glycolic Acid 7% Exfoliating Toner", "Differin Adapalene Gel 0.1% Acne Treatment"], "fix": "Alternate nights: use Differin on Monday/Wednesday/Friday, and Glycolic Acid on Tuesday/Saturday." } ], "missing_routine_steps": ["moisturizer", "sunscreen"] }, "best_replacement": { "title": "Purito Oat-In Calming Gel Cream", "price_usd": 17, "why_recommended": "100% fungal acne safe, zero pore-clogging comedogenic oils, replenishes moisture without heaviness.", "buy_url": "https://getbrightskin.com/go/purito-oat-in-calming-gel-cream", "multi_store_links": [ { "store": "Amazon", "url": "https://getbrightskin.com/go/purito-oat-in-calming-gel-cream?store=amazon" }, { "store": "YesStyle", "url": "https://getbrightskin.com/go/purito-oat-in-calming-gel-cream?store=yesstyle" }, { "store": "iHerb", "url": "https://getbrightskin.com/go/purito-oat-in-calming-gel-cream?store=iherb" } ] } } ``` --- ## 3. Curated Product Index (Sample) - SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum SPF50+ PA++++ (SKIN1004) [sunscreen]: https://getbrightskin.com/analyze/skin1004-madagascar-centella-hyalu-cica-water-fit-sun-serum -> buy link: https://getbrightskin.com/go/skin1004-madagascar-centella-hyalu-cica-water-fit-sun-serum - Beauty of Joseon Relief Sun : Rice + Probiotics SPF50+ PA++++ (Beauty of Joseon) [sunscreen]: https://getbrightskin.com/analyze/beauty-of-joseon-relief-sun-rice-probiotics -> buy link: https://getbrightskin.com/go/beauty-of-joseon-relief-sun-rice-probiotics - EltaMD UV Clear Broad-Spectrum SPF 46 Facial Sunscreen (EltaMD) [sunscreen]: https://getbrightskin.com/analyze/eltamd-uv-clear-broad-spectrum-spf-46 -> buy link: https://getbrightskin.com/go/eltamd-uv-clear-broad-spectrum-spf-46 - Purito SEOUL Oat-In Calming Gel Cream (Purito SEOUL) [moisturizer]: https://getbrightskin.com/analyze/purito-oat-in-calming-gel-cream -> buy link: https://getbrightskin.com/go/purito-oat-in-calming-gel-cream - Geek & Gorgeous Hydration Station (Fungal Acne Safe Moisturizer) (Geek & Gorgeous) [moisturizer]: https://getbrightskin.com/analyze/geek-and-gorgeous-hydration-station -> buy link: https://getbrightskin.com/go/geek-and-gorgeous-hydration-station - AESTURA Atobarrier 365 Ceramide Barrier Cream (AESTURA) [moisturizer]: https://getbrightskin.com/analyze/aestura-atobarrier-365-cream -> buy link: https://getbrightskin.com/go/aestura-atobarrier-365-cream - Vanicream Daily Facial Moisturizer for Sensitive Skin (Vanicream) [moisturizer]: https://getbrightskin.com/analyze/vanicream-daily-facial-moisturizer -> buy link: https://getbrightskin.com/go/vanicream-daily-facial-moisturizer - Vanicream Gentle Facial Cleanser for Sensitive & Fungal-Acne Skin (Vanicream) [cleanser]: https://getbrightskin.com/analyze/vanicream-gentle-facial-cleanser -> buy link: https://getbrightskin.com/go/vanicream-gentle-facial-cleanser - Round Lab 1025 Dokdo Low-pH Amino Acid Cleanser (Round Lab) [cleanser]: https://getbrightskin.com/analyze/round-lab-1025-dokdo-cleanser -> buy link: https://getbrightskin.com/go/round-lab-1025-dokdo-cleanser - Paula's Choice SKIN PERFECTING 2% BHA Salicylic Acid Liquid Exfoliant (Paula's Choice) [exfoliant]: https://getbrightskin.com/analyze/paulas-choice-2-percent-bha-liquid-exfoliant -> buy link: https://getbrightskin.com/go/paulas-choice-2-percent-bha-liquid-exfoliant - Peach Slices Acne Exfoliating Toner (2% BHA + Centella Dupe) (Peach Slices) [exfoliant]: https://getbrightskin.com/analyze/peach-slices-acne-exfoliating-toner -> buy link: https://getbrightskin.com/go/peach-slices-acne-exfoliating-toner - Anua Azelaic Acid 10% Hyaluron Redness Soothing Serum (Anua) [serum]: https://getbrightskin.com/analyze/anua-azelaic-acid-10-hyaluron-redness-soothing-serum -> buy link: https://getbrightskin.com/go/anua-azelaic-acid-10-hyaluron-redness-soothing-serum - COSRX Advanced Snail 96 Mucin Power Essence (COSRX) [essence]: https://getbrightskin.com/analyze/cosrx-advanced-snail-96-mucin-power-essence -> buy link: https://getbrightskin.com/go/cosrx-advanced-snail-96-mucin-power-essence - Timeless 20% Vitamin C + E Ferulic Acid Serum (SkinCeuticals C E Ferulic Dupe) (Timeless Skin Care) [serum]: https://getbrightskin.com/analyze/timeless-20-percent-vitamin-c-e-ferulic-acid-serum -> buy link: https://getbrightskin.com/go/timeless-20-percent-vitamin-c-e-ferulic-acid-serum - Beauty of Joseon Revive Serum : Ginseng + Liposomal Retinal (Full-Face & Eye) (Beauty of Joseon) [treatment]: https://getbrightskin.com/analyze/beauty-of-joseon-revive-eye-serum-ginseng-retinal -> buy link: https://getbrightskin.com/go/beauty-of-joseon-revive-eye-serum-ginseng-retinal - Differin Adapalene Gel 0.1% Prescription-Strength Retinoid (Differin) [treatment]: https://getbrightskin.com/analyze/differin-adapalene-gel-0-1-acne-treatment -> buy link: https://getbrightskin.com/go/differin-adapalene-gel-0-1-acne-treatment - CeraVe Moisturizing Cream (In the Tub) (CeraVe) [moisturizer]: https://getbrightskin.com/analyze/cerave-moisturizing-cream-tub -> buy link: https://getbrightskin.com/go/cerave-moisturizing-cream-tub - La Roche-Posay Toleriane Double Repair Face Moisturizer (La Roche-Posay) [moisturizer]: https://getbrightskin.com/analyze/la-roche-posay-toleriance-double-repair-face-moisturizer -> buy link: https://getbrightskin.com/go/la-roche-posay-toleriance-double-repair-face-moisturizer - Anua Heartleaf Pore Control Cleansing Oil (Anua) [oil_cleanser]: https://getbrightskin.com/analyze/anua-heartleaf-pore-control-cleansing-oil -> buy link: https://getbrightskin.com/go/anua-heartleaf-pore-control-cleansing-oil - The Ordinary Glycolic Acid 7% Exfoliating Toner (The Ordinary) [exfoliant]: https://getbrightskin.com/analyze/the-ordinary-glycolic-acid-7-exfoliating-toner -> buy link: https://getbrightskin.com/go/the-ordinary-glycolic-acid-7-exfoliating-toner - PanOxyl Acne Foaming Wash Maximum Strength 10% Benzoyl Peroxide (PanOxyl) [cleanser]: https://getbrightskin.com/analyze/panoxyl-acne-foaming-wash-10-benzoyl-peroxide -> buy link: https://getbrightskin.com/go/panoxyl-acne-foaming-wash-10-benzoyl-peroxide - CeraVe Hydrating Facial Cleanser for Normal to Dry Skin (CeraVe) [cleanser]: https://getbrightskin.com/analyze/cerave-hydrating-cleanser -> buy link: https://getbrightskin.com/go/cerave-hydrating-cleanser - CeraVe Foaming Facial Cleanser for Normal to Oily Skin (CeraVe) [cleanser]: https://getbrightskin.com/analyze/cerave-foaming-facial-cleanser -> buy link: https://getbrightskin.com/go/cerave-foaming-facial-cleanser - CeraVe Renewing SA Cleanser with Salicylic Acid (CeraVe) [cleanser]: https://getbrightskin.com/analyze/cerave-sa-renewing-cleanser -> buy link: https://getbrightskin.com/go/cerave-sa-renewing-cleanser - CeraVe Daily Moisturizing Lotion with Ceramides and Hyaluronic Acid (CeraVe) [moisturizer]: https://getbrightskin.com/analyze/cerave-daily-moisturizing-lotion -> buy link: https://getbrightskin.com/go/cerave-daily-moisturizing-lotion - CeraVe PM Facial Moisturizing Lotion Ultra Lightweight (CeraVe) [moisturizer]: https://getbrightskin.com/analyze/cerave-pm-facial-moisturizing-lotion -> buy link: https://getbrightskin.com/go/cerave-pm-facial-moisturizing-lotion - The Ordinary Retinol 0.2% in Squalane (The Ordinary) [treatment]: https://getbrightskin.com/analyze/the-ordinary-retinol-0-2-in-squalane -> buy link: https://getbrightskin.com/go/the-ordinary-retinol-0-2-in-squalane - The Ordinary Retinol 0.5% in Squalane (The Ordinary) [treatment]: https://getbrightskin.com/analyze/the-ordinary-retinol-0-5-in-squalane -> buy link: https://getbrightskin.com/go/the-ordinary-retinol-0-5-in-squalane - The Ordinary Retinol 1% in Squalane (The Ordinary) [treatment]: https://getbrightskin.com/analyze/the-ordinary-retinol-1-in-squalane -> buy link: https://getbrightskin.com/go/the-ordinary-retinol-1-in-squalane - The Ordinary Salicylic Acid 2% Solution for Blemish-Prone Skin (The Ordinary) [exfoliant]: https://getbrightskin.com/analyze/the-ordinary-salicylic-acid-2-percent-solution -> buy link: https://getbrightskin.com/go/the-ordinary-salicylic-acid-2-percent-solution - The Ordinary Niacinamide 10% + Zinc 1% Oil Control Serum (The Ordinary) [serum]: https://getbrightskin.com/analyze/the-ordinary-niacinamide-10-zinc-1 -> buy link: https://getbrightskin.com/go/the-ordinary-niacinamide-10-zinc-1 - The Ordinary Hyaluronic Acid 2% + B5 Hydrating Serum (The Ordinary) [serum]: https://getbrightskin.com/analyze/the-ordinary-hyaluronic-acid-2-b5 -> buy link: https://getbrightskin.com/go/the-ordinary-hyaluronic-acid-2-b5 - The Ordinary Natural Moisturizing Factors + HA Surface Hydration (The Ordinary) [moisturizer]: https://getbrightskin.com/analyze/the-ordinary-natural-moisturizing-factors-ha -> buy link: https://getbrightskin.com/go/the-ordinary-natural-moisturizing-factors-ha - The Ordinary AHA 30% + BHA 2% Peeling Solution (Blood Mask) (The Ordinary) [exfoliant]: https://getbrightskin.com/analyze/the-ordinary-aha-30-bha-2-peeling-solution -> buy link: https://getbrightskin.com/go/the-ordinary-aha-30-bha-2-peeling-solution - The Ordinary Azelaic Acid Suspension 10% Brightening Cream (The Ordinary) [treatment]: https://getbrightskin.com/analyze/the-ordinary-azelaic-acid-suspension-10 -> buy link: https://getbrightskin.com/go/the-ordinary-azelaic-acid-suspension-10 - La Roche-Posay Anthelios UVMune 400 Invisible Fluid SPF50+ Sunscreen (La Roche-Posay) [sunscreen]: https://getbrightskin.com/analyze/la-roche-posay-anthelios-uvmune-400-spf50 -> buy link: https://getbrightskin.com/go/la-roche-posay-anthelios-uvmune-400-spf50 - La Roche-Posay Cicaplast Baume B5+ Ultra-Repairing Soothing Balm (La Roche-Posay) [moisturizer]: https://getbrightskin.com/analyze/la-roche-posay-cicaplast-baume-b5-plus -> buy link: https://getbrightskin.com/go/la-roche-posay-cicaplast-baume-b5-plus - La Roche-Posay Effaclar Duo+ M Anti-Imperfections Treatment (La Roche-Posay) [treatment]: https://getbrightskin.com/analyze/la-roche-posay-effaclar-duo-plus-m -> buy link: https://getbrightskin.com/go/la-roche-posay-effaclar-duo-plus-m - COSRX Low pH Good Morning Gel Cleanser with Tea Tree & BHA (COSRX) [cleanser]: https://getbrightskin.com/analyze/cosrx-low-ph-good-morning-gel-cleanser -> buy link: https://getbrightskin.com/go/cosrx-low-ph-good-morning-gel-cleanser - COSRX Advanced Snail 92 All in one Cream (COSRX) [moisturizer]: https://getbrightskin.com/analyze/cosrx-advanced-snail-92-all-in-one-cream -> buy link: https://getbrightskin.com/go/cosrx-advanced-snail-92-all-in-one-cream - Round Lab Birch Juice Moisturizing Sunscreen SPF50+ PA++++ (Round Lab) [sunscreen]: https://getbrightskin.com/analyze/round-lab-birch-juice-moisturizing-sunscreen-spf50 -> buy link: https://getbrightskin.com/go/round-lab-birch-juice-moisturizing-sunscreen-spf50 - Anua Heartleaf 77% Soothing Toner for Sensitive Skin (Anua) [toner]: https://getbrightskin.com/analyze/anua-heartleaf-77-soothing-toner -> buy link: https://getbrightskin.com/go/anua-heartleaf-77-soothing-toner - SkinCeuticals C E Ferulic Combination Antioxidant Treatment (SkinCeuticals) [serum]: https://getbrightskin.com/analyze/skinceuticals-c-e-ferulic -> buy link: https://getbrightskin.com/go/skinceuticals-c-e-ferulic - Geek & Gorgeous C-Glow 15% Vitamin C + Ferulic Acid (Dupe for SkinCeuticals) (Geek & Gorgeous) [serum]: https://getbrightskin.com/analyze/geek-and-gorgeous-c-glow -> buy link: https://getbrightskin.com/go/geek-and-gorgeous-c-glow - Kiehl's Ultra Facial Cream with Squalane and Glacial Glycoprotein (Kiehl's) [moisturizer]: https://getbrightskin.com/analyze/kiehls-ultra-facial-cream -> buy link: https://getbrightskin.com/go/kiehls-ultra-facial-cream - Aveeno Calm + Restore Oat Gel Facial Moisturizer for Sensitive Skin (Aveeno) [moisturizer]: https://getbrightskin.com/analyze/aveeno-calm-and-restore-oat-gel-moisturizer -> buy link: https://getbrightskin.com/go/aveeno-calm-and-restore-oat-gel-moisturizer - Neutrogena Oil-Free Acne Wash Facial Cleanser with 2% Salicylic Acid (Neutrogena) [cleanser]: https://getbrightskin.com/analyze/neutrogena-oil-free-acne-wash -> buy link: https://getbrightskin.com/go/neutrogena-oil-free-acne-wash - Neutrogena Oil-Free Acne Wash Pink Grapefruit Facial Cleanser (2% Salicylic Acid) (Neutrogena) [cleanser]: https://getbrightskin.com/analyze/neutrogena-oil-free-acne-wash-pink-grapefruit -> buy link: https://getbrightskin.com/go/neutrogena-oil-free-acne-wash-pink-grapefruit - Neutrogena Hydro Boost Water Gel Moisturizer with Hyaluronic Acid (Neutrogena) [moisturizer]: https://getbrightskin.com/analyze/neutrogena-hydro-boost-water-gel -> buy link: https://getbrightskin.com/go/neutrogena-hydro-boost-water-gel - Haruharu WONDER Black Rice Moisture Airyfit Daily Sunscreen (Chemical, Yellow Tube) (Haruharu WONDER) [sunscreen]: https://getbrightskin.com/analyze/haruharu-wonder-black-rice-airyfit-sunscreen-spf50 -> buy link: https://getbrightskin.com/go/haruharu-wonder-black-rice-airyfit-sunscreen-spf50 --- ## 4. About Purchase Links Product links use the form `https://getbrightskin.com/go/[slug]` (optionally `?store=amazon|yesstyle|iherb`). They redirect to an authorized retailer for the user's region. These are affiliate links: Bright Skin may earn a commission on purchases at no extra cost to the buyer.