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Section: Testing > Method/Process

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Why the FDA's 'Sunscreens in the Bloodstream' Study is Flawed

A recent study published in the Journal of the American Medical Association tested the potential systemic absorption of certain sunscreens. Results identified their presence in subjects' bloodstreams; however, as industry expert David Steinberg explains, the study is misleading and fails to consider crucial variables.

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Sunscreen Absorption Makes Waves Again, FDA Shifts Toward Test Sample Selection

Questions of sunscreen absorption made waves once again in a recent report in the Wall Street Journal. Prior reports found no cause for concern while more recently, the FDA turned its focus to the selection method for sunscreens used in absorption tests.

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FDA Sets Regulatory Framework for Regenerative Biological Therapies

It's a sign of the times when technology and innovation hit a point where the U.S. Food and Drug Administration must stop and write new rules to ensure consumer safety. That time, with respect to regenerative biological therapies, is now.

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FDA Clarifies Executive Summary on Talc is Solely to Solicit Data

In response to concerns that the FDA's Executive Summary on talc could be interpreted as official recommendations, the agency clarified this summary is solely intended to solicit scientific information.

The goal was to improve the sensitivity and consistency of analyses and inter-laboratory concurrence relevant to reporting asbestos and similar particles in talc that could potentially affect cosmetic product safety.

5 Key Facets of Talc Testing: FDA Paper Outlines Expert Consensus

The goal was to improve the sensitivity and consistency of analyses and inter-laboratory concurrence relevant to reporting asbestos and similar particles in talc that could potentially affect cosmetic product safety.

A letter from the FDA to Valisure, dated Dec. 5, 2022, highlighted 'methodological deficiencies' and 'analytic descrepancies' in the company's testing.

FDA, Unilever and GSK Challenge Valisure's Benzene Findings, Test Methods

The FDA recently raised concerns over the test methods of Valisure, the Connecticut-based lab whose reports over benzene in sunscreen and dry shampoo products from Unilever, GSK and others have prompted recalls and class action suits.

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Is Your Microbiology Lab FDA-compliant? Part I: Personnel, Facilities and Equipment

This two-part article provides an overview of areas relevant to the U.S. Food and Drug Administration’s (FDA’s) inspection of cosmetic microbiology laboratories. Part II will appear in our July 2018 edition.

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Is Your Microbiology Lab FDA-compliant? Part II: Cultures, Growth Media, Reagents and Testing

This two-part article provides an overview of areas relevant to the U.S. Food and Drug Administration’s (FDA’s) inspection of cosmetic microbiology laboratories. Part 1 covered personnel, facilities and equipment, test materials and procedures, and documentation. Part 2 addresses microbial cultures and growth media, biochemical reagents, test procedures and more.

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Detecting Coral Stress in Response to Sunscreens

Metabolomics is at the heart of recent work published in Nature Scientific Reports, wherein an increase in a known steroid in coral was noted in the presence of three common sunscreen ingredients.

Adapting Spf Testing Methods For Mineral Sunscreen Density

Adapting SPF Testing Methods for Mineral Sunscreen Density

A sunscreen layer’s thickness is critical to its SPF. However, current regulations specify a mass application rate for testing, rather than a volumetric application rate. This significantly underrates the SPF values of mineral sunscreens due to their higher densities since, compared with their relative organic counterparts, thinner films are being tested, as will be shown here.

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New Sunscreen Allows Body to Produce Vitamin D

Researchers discovered altering ingredients in sunscreens allows the body to produce vitamin D, which led to a new sunscreen development called Solar D.

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Don’t Count On Genetics, Sunscreens are the Best Bet

In a podcast with P&G scientists Frauke Neuser, Ph.D. and Rosemarie Osborne, Ph.D., Cosmetics & Toiletries learned about genetic studies in support of the Olay brand, and more. Following is an excerpt.

A Laboratory Method for Measuring the Water Resistance of Sunscreens

A new laboratory in vitro method for the measurement of sunscreen water resistance uses spectrophotometric analysis of a model skin substitute before and after 80-minute immersion. It gives good correlation with the FDA’s 80-minute immersion SPF results (very water resistant). The method is especially good for screening new formulations or water-resistant technologies.

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In Vitro and In Vivo Offered for Sunscreen Testing

Laboratoire Dermscan and HelioScreen Labs are combining their skills to offer a complete new in vitro / in vivo service in the field of sunscreen testing.

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[podcast] Sunscreen Innovation Act Update: MUsT Test and Penetration Potential

"What’s changed with respect to sunscreen evaluation is ... the test model they are using now is designed for drugs ...and has never been applied previously for the sunscreens," Epstein reports.

Photostability Test for Additional Sunscreen Claims, Part III: New Claim

Proposed here is an in vitro method, based on UV transmission measurements at two irradiation doses, to test and rank sunscreens based on their photostabilities. This approach was used to assess some 107 sunscreens and shows how, by strictly controlling key parameters, comparisons between the photostabilities of products can be made, with potential for new label claims.

Photostability Test for Additional Sunscreen Claims, Part I: Protocol Setup

Proposed here is an in vitro method, based on UV transmission measurements at two irradiation doses, to test and rank sunscreens based on their photostabilities. This approach was used to assess some 107 sunscreens and shows how, by strictly controlling key parameters, comparisons between the photostabilities of products can be made, with potential for new label claims.

Gattefossé studied the effects of sunscreen on skin that had layered products in order to analyze sensory and efficacy.

Gattefossé Reveals Effects of Sunscreen, Moisturizer, Film Former Layering

Gattefossé analyzed the efficacy and sensory effects of sunscreens applied to skin on top of other products. Results suggest film formers are a key ingredient.

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