Most biscuits do not contain preservatives. This is due to a number of factors, but mainly the low water activity in biscuits.
In the unlikely event that your biscuits contain preservatives, we explain why that's a good thing... There can be a perception about preservatives which we need to overcome so that we can reduce food waste. For example, addition of salt or baking powder, calcium propionate or vinegar can all assist with increasing shelf life – an increased shelf life means a longer time you will have to enjoy and eat your fresh food before it goes off and ends up in the bin. In many respects, preservatives can be our best friends in the fight against food waste!