Given the large and increasing demand for organic foodstuffs in the UK and elsewhere, an up-to-date objective independent statement on the nutrient and other nutritionally relevant substance composition of organically and conventionally produced foodstuffs is needed for both public policy and consumer advice. The aim of this report is to systematically review and compare the composition of organically and conventionally produced foodstuffs, focusing only on nutrients and other nutritionally relevant substances (nutrients and other substances). This review specifically does not address contaminant content (such as herbicide, pesticide and fungicide residues) of organically and conventionally produced foodstuffs or.