Any allergenic ingredient used on your site should be labelled; it sounds obvious, but it can be overlooked easily. There’s a number of ways to do this, such as tagging the allergens with a specifically coloured label (think yellow for egg, green for nuts, and so on), or having all 14 allergens on the tag and ticking the ones present. It's also a good idea to ensure clear storage container/dispenser identification too (IndeliMarking is great for this). Whichever way you go, just make sure you stick to it.