The invention concerns a pharmaceutical composition or a food supplement containing at least an iron complexing protein optionally in the presence of at least an iron salt, and at least a precursor of nitrogen monoxide metabolism and/or at least a chemical donor of nitrogen monoxide, the use of at least an iron complexing agent and of at least a precursor of nitrogen monoxide metabolism and/or a chemical donor of nitrogen monoxide, and optionally at least an iron salt for making pharmaceutical compositions in particular for treating asthenia or anaemia or for making a food supplement.