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Title
Cod liver oil intake and incidence of asthma in Norwegian adults--the HUNT study.
Authors
Mai, Xiao-Mei; Langhammer, Arnulf; Chen, Yue; Camargo, Carlos A, Jr
Abstract
Cod liver oil is an important source of vitamin D, but also contains other fat-soluble components such as vitamin A. Before 1999, the cod liver oil formula in Norway contained a high concentration of vitamin A (1000 µg per 5 ml). High vitamin A status is associated with increased risks of several chronic diseases.