What really goes into our food

Do we really know what goes into the food we eat?  I found this lorry parked in front of the food centre at Newton Circus early this morning.  The driver unloaded some of the goods from his lorry and delivered them to the food stall owners at the food centre.  Notice that the goods are mainly sauces used in the food we eat.  Notice also that these sauces appear homemade - they are kept in label-less containers.  Are they safe for consumption?