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Assessment of homogeneity and UV filter skin retention

Formulators are looking to increase performance of sunscreens while reducing the concentration of filters. Complife look into this challenging issue.

Sunscreens have been used for more than a century to protect the skin against the harmful effects of ultraviolet radiation. Although the beneficial role of sunscreens in protecting the skin, there is increasing evidence of UV filters’ systemic absorption and environmental repercussions. Sunscreen formulators are now facing the challenge of increasing sunscreen performance while decreasing the UV filter concentration.

In a collaborative study with a customer we evaluated the ability of a raw material in increasing the homogeneity of application and the retention on skin of UV filters. In order to reach this goal, a preliminary study on 6 subjects was carried out using two simple and reliable techniques: UV fluorescence emission and the skin stripping technique. 

The test product demonstrated a better homogeneity of application (≈50%) and a better retention on skin than the base formula containing only the UV filters. These results were confirmed by the SPF measurement (5.2 points higher than the base cream plus UV filters).

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Upcoming Events

in-cosmetics Global

Paris Expo Porte de Versailles
16th – 18th April 2024

NYSCC Suppliers' Day 2024

Javits Center, New York
1st - 2nd May 2024

9th Anti-Ageing Skin Care Conference

Royal College of Physicians, London
25th - 26th June 2024

in-cosmetics Korea 2024

Hall C, Coex, Seoul, South Korea
24th - 26th July 2024

in-cosmetics Latin America 2024

São Paulo, Brazil
25th - 26th September 2024

IFSCC 2024

Recanto das Cataratas Thermas Resort, Iguazu Falls, Brazil
14th - 17th October 2024

Access the latest issue of Personal Care Magazine on your mobile device together with an archive of back issues.

Download the FREE Personal Care Magazine app from your device's App store

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