A sample of nine patients from a cosmetic factory in France were analysed in the study. All participants were exposed to the product in three different forms: crude granules, powder or liquid.
Each participant completed a questionnaire about their medical history. Lung function tests and allergy tests were also carried out, along with an inhalation challenge test, which examines the airways specific reaction to a substance (in this case argan).
Out of the nine workers, four displayed asthma or rhinitis symptoms and had a blocked nose when handling argan powder. The results found that three of them had occupational asthma caused by argan powder, proved by specific challenge tests. Two of the four also had a positive allergy skin prick-test to argan powder.
Dr Emmanuelle Penven, lead author of the study, said: "Occupational asthma can be a debilitating condition if it prevents a person from working. This study is very preliminary but does suggest an association between argan powder and occupational asthma. Our initial findings warrant further research to understand any health risks associated with the compound."
• Argan powder found in some cosmetics linked with occupational asthma , ERS Annual Congress Press realeases, 9 September 2013.