“Natural flavours” is a somewhat vague term that describes ingredients that are derived from plant and animal products, such as from spices, fruits, vegetables, herbs, dairy products, meat and eggs, according to the U.S. Food and Drug Administration (FDA). In the UK, all flavouring is subject to approval.
Article source: https://www.huffingtonpost.co.uk/entry/are-non-dairy-milks-unhealthy_uk_62837e91e4b0c84db729beb8