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Type: Article

Section: Testing > Method/Process

Johann W. Wiechers, Ph.D.

Words from Wiechers on 'Snake Oil Sellers'

Now more than ever, "snake oil sellers" have access to consumers, which may be, in part, why the industry is consistently under attack. In this first installment of our new "Words from Wiechers" series, column editor Tony O'Lenick shares lessons for the betterment of both formulas and the industry's overall credibility.

Wise Words From the Bench with Gavin Greenoak

After 25 years in the industry, Gavin Greenoak, managing and scientific director of the Australian Photobiology Testing Facility Pty., Ltd. (APTF), continues to strive for a better understanding of the interaction of light and the human body. Greenoak’s career began in cancer research, which has afforded him unique insight of skin biology and the effects of sun exposure.

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Lab Lessons—Wise Words From the Bench With Sergio Nacht, PhD

Today, product formulation goes hand in hand with efficacy testing, but nearly 40 years ago, when Sergio Nacht, PhD, started out in the personal care industry, it was a different story. Throughout his decades in personal care, Nacht has developed methodologies that have allowed the personal care industry to establish efficacy of a product and convey this to the consumer. He has also been instrumental in the increased efficacy of personal care products through sustained release.

In the Land of the Blind: Applying a Single-blind Study to Finished Products

Following positive feedback from a previous column on the placebo effect, Wiechers readdresses clinical study design in relation to cosmetic claim substantiation—this time discussing when to perform double-blind studies and when to perform single-blind studies.

Much Ado About Nothing: Cosmetics Testing with a Placebo

In this column, the author investigates the source of the placebo effect. In addition, he asks the question: Must cosmetics testing always incorporate tests against a placebo?

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Analyzing Deposition from Rinse-off Hair Products

The most common approach to determine ingredient deposition on hair is to analyze the treated tresses, but this poses several challenges. Instead, the authors describe a novel approach based on determining the amount of ingredient collected in the rinse water, and back-calculating the amount deposited on hair. Development and validation efforts discussed here use polydimethylsiloxane as a model compound.

Flexabrasion A Method For Evaluating Hair Strength

From the Archives … Flexabrasion: A Method for Evaluating Hair Strength

From the December 2001 issue of Cosmetics & Toiletries, this article describes how both bending and abrasion should be tested–along with extension–when evaluating hair strength, as the authors show here in tests of an active developed to increase the strength of bleached hair.

Evaluating Droplet Size in Nanoemulsions from a Novel Emulsifier System

This article describes two sophisticated techniques to measure the diameter of emulsion droplets on the nanometer scale and uses those techniques to test a new emulsifying agent capable of spontaneously creating emulsions with droplet sizes smaller than 300 nm.

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Patent Picks—Microbe Separation, Emulsion Arrays and Salicylic Acid Delivery From Powder

Patent Picks are compiled by the editors from publicly available sources. This edition features processes for identifying microorganisms, forming emulsion arrays and delivering salicylic acid from powder.

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Validate the efficacy of actives, raw materials & products in preventing/repairing skin damage from environmental pollution

Learn more about The Environmental Stress Panel – an innovative gene expression panel developed by Genemarkers, the leader in applying state-of-the-art genomics technologies to personal care product development.

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