Non-vegans might raise a quizzical eyebrow at some of the products that fall into the 'accidentally vegan' category, but for those who choose to eat a diet free from animal products it is an unexpected bonus when walking down the supermarket aisle.
So much so that ever-growing lists are springing up on websites, forums and even social media sites devoted to veganism.
Claire Miller compiled PETA Australia's very comprehensive online list and says it is good to make yourself aware. Not many 'accidentally vegan' products are labelled as such. In some cases this is because companies can't guarantee what has churned through the industrial sized blenders or baked in the supersized ovens before the 'accidentally vegan' products had their turn in the production process. Companies may also refuse to guarantee whether additives sourced down the supply chain are of plant or animal origin.
"Most [food] labels are very clear and even some have a vegan symbol," Miller says.
However, Miller encourages vegans to be vigilant label-readers.
"Ingredients do tend to change and companies change their ingredients without informing [the public]," Miller warns.
Here are six 'ninja vegan' products that may surprise you…