The effect of an organic food intervention treatment on biomarkers of exposure to lead and cadmium in primary school children of Cyprus: A cluster-randomized crossover trial

•To our knowledge, this is the first trial examining the effect of an organic food treatment on urinary metals in children.•A 40-day organic food treatment reduced primary school children's exposure to lead over time.•Lead and cadmium levels were significantly associated with biomarkers of oxidative damage (8-OHdG, 8-iso-PGF2a and MDA).