A toxicological pre-screening compiles, validates, and calculates all chemical, exposure, and toxicological data before submission to a board-certified toxicologist (DABT or ERT). Ensuring this dossier is complete prevents data deficiencies, reduces revision cycles, and ensures immediate acceptance.

1. Quantitative Formulation Deconstruction

  • [ ] 100.00% Formula Reconciliation: Confirm exact quantitative percentages (w/w) totaling exactly 100.000%, with no vague ranges.

  • [ ] Chemical Identifiers: Document INCI name, CAS number, and EC/EINECS number for every single constituent.

  • [ ] Raw Material Breakdown: Deconstruct all trade-name blends and proprietary mixtures into their individual chemical constituents (e.g., active solvent, preservatives, stabilizers, processing aids).

  • [ ] Function: Identify the technical function of each ingredient in the matrix (e.g., surfactant, emollient, chelator, preservative).

2. Consumer Exposure Profiling & Intended Use Parameters

  • [ ] Target Population: Define user demographic (adults, infants/children under 3, pregnant/lactating women, sensitive/compromised skin).

  • [ ] Application Details:

    • Product category (leave-on vs. rinse-off).

    • Application anatomical site (e.g., generalized body, face, periorbital area, mucous membranes, lips).

    • Retention factor (R) based on Scientific Committee on Consumer Safety (SCCS) or regulatory exposure models.

  • [ ] Quantitative Daily Exposure:

    • Amount applied per application (g/day).

    • Frequency of use (events/day).

    • Default consumer body weight assigned (standard: 60 kg adult; specific scaled weights for infants/children).

  • [ ] Route of Exposure: Primary route (dermal) plus secondary routes (accidental ingestion for lip products; aerosol inhalation for sprays, powders, and fine mists).

3. Raw Material Documentation & Impurity Screening

  • [ ] Safety Data Sheets (SDS): 16-section GHS-compliant SDS for each trade name material (verifying Sections 2, 8, 11, and 12).

  • [ ] Certificates of Analysis (CoA): Representative CoAs with verified batch-level specifications and analytical release assays.

  • [ ] Heavy Metal Specs: Quantitative limits for elemental impurities (Lead, Arsenic, Cadmium, Mercury, Antimony, and Nickel).

  • [ ] Residual Solvents & Synthesis Byproducts: Testing or low-risk declarations for:

    • 1,4-Dioxane (ethoxylated surfactants).

    • Ethylene oxide.

    • Free formaldehyde / formaldehyde releasers.

    • Nitrosamines and secondary amine precursors.

    • Residual monomers (e.g., acrylic acid, acrylamide).

  • [ ] Botanical & Natural Extract Characterization:

    • Extraction solvent used and drug-to-extract ratio (DER).

    • Plant part, botanical name (genus and species), and pesticide/mycotoxin limits.

    • Residual volatile organic compounds (VOCs).

  • [ ] Fragrance & Flavor Profiles:

    • IFRA Conformity Certificate (confirming category-specific maximum use limits).

    • Quantitative breakdown of designated fragrance allergens (EU Annex III and MoCRA lists).

4. Toxicological Hazard Characterization & Literature Review

  • [ ] Authoritative Dossier Mining: Screen and extract data from primary toxicological compendia:

    • Cosmetic Ingredient Review (CIR) Expert Panel Assessments.

    • Scientific Committee on Consumer Safety (SCCS) Opinions.

    • European Chemicals Agency (ECHA) REACH Registration Dossiers.

    • US NTP (National Toxicology Program) and WHO/IARC Monographs.

    • EPA IRIS (Integrated Risk Information System) and PubMed peer-reviewed literature.

  • [ ] Endpoint Review:

    • Acute Toxicity: Oral, dermal, and (if sprayable) inhalation LD50 / LC50.

    • Skin & Eye Irritation: In vitro or historical in vivo irritation profile.

    • Skin Sensitization: Human Repeat Insult Patch Test (HRIPT), Local Lymph Node Assay (LLNA), or OECD-compliant non-animal test battery (DPRA, KeratinoSens, h-CLAT).

    • Sub-chronic / Chronic Systemic Toxicity: Extract Points of Departure—specifically NOAEL (No Observed Adverse Effect Level) or BMDL (Benchmark Dose Lower Confidence Limit), prioritizing 90-day oral rodent studies.

    • Genotoxicity / Mutagenicity: Ames test (OECD 471), in vitro mammalian chromosomal aberration / micronucleus data.

    • Carcinogenicity & Reproductive/Developmental Toxicity (CMR): Verification that no ingredient is classified as a Category 1A, 1B, or 2 CMR substance.

  • [ ] Dermal Absorption: Document empirical dermal absorption rates (% Abs or ug\cm2). If experimental data is absent, assign conservative regulatory default values (e.g., 50% or 100% absorption).

5. Preliminary Quantitative Exposure & Safety Calculations

  • [ ] Systemic Exposure Dose (SED) Calculation:

    Compute daily systemic intake per ingredient:

    (Where Eproduct = daily product exposure, C = concentration in formulation, DAp = dermal absorption, and BW = consumer body weight).

  • [ ] Preliminary Margin of Safety (MoS):

    Calculate initial margin for all systemic endpoints:

    Flag any ingredient where MoS < 100 for special toxicologist attention, route-to-route extrapolation adjustments, or reduction in formulation concentration.

  • [ ] Threshold of Toxicological Concern (TTC): For trace impurities lacking standard animal toxicity data, assign Cramer Structural Classes (Class I, II, or III) to establish if exposure falls below toxicological thresholds.

6. Regulatory & Cross-Jurisdictional Screening

  • [ ] Banned & Prohibited Substance Screening: Cross-reference formulation against:

    • EU Cosmetics Regulation (EC) No. 1223/2009 (Annex II prohibited; Annex III restricted; Annex IV colorants; Annex V preservatives; Annex VI UV filters).

    • Health Canada Cosmetic Ingredient Hotlist.

    • State statutory bans (e.g., Washington & California Toxic-Free Cosmetics Acts for PFAS, phthalates, formaldehyde releasers).

  • [ ] California Proposition 65:

    • Identify potential Prop 65-listed leachables originating from the packaging (e.g., Bisphenol A/BPS in resin linings, phthalate plasticizers in flexible tubes, or heavy metal migration from colored glass).

    • Calculate potential leachable consumer exposure ($\mu\text{g/day}$) and compare against established OEHHA Safe Harbor Levels (NSRLs / MADLs) to confirm whether a warning is legally required.

7. Product Stability, Packaging & Phthalate Regulatory Screening

  • This section validates physical formulation stability, primary packaging material compatibility, and compliance with heavy metal, toxicant, and phthalate restrictions prior to final toxicological sign-off.

    • [ ] Physical Stability & Shelf-Life Data:

      • Confirm accelerated (e.g., 40°C / 75% RH) and real-time stability testing results.

      • Verify the absence of hazardous phase separation, active ingredient degradation, or significant pH drift over the intended product shelf life.

    • [ ] Preservative Efficacy / Microbial Control:

      • Review USP <51> Antimicrobial Effectiveness Testing (or ISO 11930) data to verify the formula resists microbial growth and consumer inoculation.

    • [ ] Phthalate Screening (Packaging & Formula):

      • Packaging Plasticizers: Verify that flexible plastic components (tubes, dropper bulbs, gaskets, dip tubes, vinyl labels, and pump liners) do not contain intentionally added ortho-phthalates (e.g., DEHP, DBP, BBP, DINP, DIDP, DnOP). Obtain a signed Phthalate-Free Certificate of Compliance (CoC) or GC-MS lab screening from the packaging manufacturer.

      • Formula & Fragrance Solvents: Confirm that no restricted phthalates (historically used as fragrance fixatives or alcohol denaturants, such as DEP or DBP) are present in the raw materials or fragrance compound.

      • Statutory Restrictions: Verify compliance with state bans (California AB 2762 / AB 496, Washington Toxic-Free Cosmetics Act) and EU Annex II restrictions prohibiting designated ortho-phthalates as reproductive toxicants.

    • [ ] Toxics in Packaging Legislation (TPCH) / Heavy Metal Compliance:

      • Obtain a Certificate of Compliance (CoC) or laboratory assay (XRF / ICP-MS) confirming that the sum of Lead (Pb) + Cadmium (Cd) + Mercury (Hg) + Hexavalent Chromium (Cr-VI) does not exceed 100 ppm (0.01% by weight) across any packaging component, ink, or exterior coating.

    • [ ] Chromium Speciation & Plated Closures:

      • For metallized caps, electroplated pump collars, and chrome-based pigments or inks, confirm the absence of Hexavalent Chromium (Cr-VI) residuals from plating baths (verifying the use of trivalent chromium Cr-III or vacuum metallization).

    • [ ] PFAS Restrictions:

      • Confirm packaging materials, barrier coatings, and cap liners have no intentionally added per- and polyfluoroalkyl substances (PFAS), per updated TPCH guidelines and state-level packaging prohibitions.

    • [ ] California Proposition 65 Packaging Interaction & Leachable Testing:

      • Screen packaging contact surfaces for listed chemicals prone to leaching or migration (including DEHP, DINP, DBP, Bisphenol A/BPS from epoxy linings, and heavy metals from colored glass).

      • Where migration is suspected, calculate daily consumer exposure (ug/day) and benchmark against OEHHA Safe Harbor Levels (NSRLs / MADLs) to confirm warning exemptions.

Toxicological Risk Assessment (TRA) Pre-Screening Checklist