[Experiences with cinnamic acid esters as sunscreening agents]

After incorporation in ointment bases and cosmetics usual in trade 2-Ethylhexyl-4-methoxycinnamat being known as skin compatible was investigated for light protection efficacy in determining the sun protection factor (SPF). Despite different penetration power into the stratum corneum we obtained low SPF from all tested oils. In emulsion bases as a rule the SPF corresponded to the concentration of the filter, respectively little lower values were found. Most of the SPF-values did not vary significantly, although the investigated preparations were different in emulsions-type, ingredients and additives. Formulations containing 2-Ethylhexyl-4-methoxycinnamat in bases being of pharmacopoeial quality are recommended as alternative for incompatible sun cosmetics and drugs.