A total of 92 corn-based food products consisting of 53 low-processed and 39 processed samples were collected at random from retail markets and bazaars in various provinces of Turkey and analysed for total fumonisin levels. Twenty-one (40%) low-processed and nine (23%) processed samples were found to contain fumonisin. Total fumonisin contamination in the low-processed products ranged from 0.8 to 273 mg kg(-1), and in the processed products from 0.3 to 76.8 mg kg(-). Considering all 92 samples, the highest frequency of detection and the highest concentrations (in flour samples up to 273 mg kg(-1)) were detected in low-processed products. These results indicated the natural contamination of corn-based low-processed and processed food products for human consumption in Turkey by fumonisins.