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Updated: Jun 20, 2026

Microwave-Assisted Extraction of Phenolic Compounds and Antioxidants for Cosmetic Applications Using Polyol-Based Technology

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Refining aggregate exposure: example using parabens.

Christina E Cowan-Ellsberry¹, Steven H Robison

¹The Procter & Gamble Company, Cincinnati, OH, USA. cellsberry@gmail.com

Regulatory Toxicology and Pharmacology : RTP

|August 19, 2009

Summary

Estimating aggregate chemical exposure is refined by considering product co-use and ingredient usage. This improved method significantly reduces exposure estimates for widely used parabens, ensuring safety below acceptable daily intake levels.

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Published on: February 23, 2020

Area of Science:

Environmental Health
Toxicology
Risk Assessment

Background:

Accurate aggregate exposure assessment is crucial for ingredients used across diverse product types.
Current summation methods overestimate exposure due to variations in individual product use patterns.
Ingredient presence varies even within the same product category, complicating simple exposure addition.

Purpose of the Study:

To develop and illustrate a refined approach for estimating aggregate chemical exposure.
To incorporate product co-use, ingredient usage extent, and toxicokinetic data into exposure models.
To assess the refinement in aggregate exposure estimates for parabens in personal care products.

Main Methods:

Utilized data on product co-use and non-use patterns.
Incorporated information on the extent of product types containing the ingredient.
Included dermal penetration and metabolism data for enhanced accuracy.

Main Results:

Refined aggregate exposure estimates for methyl, ethyl, n-propyl, and n-butyl parabens were reduced by 51-92% compared to simple addition.
The refined estimates remained conservative, being 2-92 times lower than the 95th percentile of biomonitoring data.
All refined exposure estimates were below the acceptable daily intake (ADI) of 10 mg/kg/day for parabens.

Conclusions:

A refined aggregate exposure estimation method provides more realistic and lower exposure values.
This approach enhances the safety assessment of widely used cosmetic and personal care ingredients.
The refined paraben exposure estimates support their continued safe use within established guidelines.