Our friend gelatin, which helps to in the fining process along with kieselsol to make our wines brilliantly clear.
The addition of stabilants and fining agents is done at the first racking, as seen in this photo. Making sure to fully incorporate/mix your sulphites and fining agents to ensure that the additions are well dissolved into all of the wine. For those that are curious about gluten sensitivities and wine making, give this a read. "I'm allergic to gluten. What red wines can I drink?" I think it covers the topic well and also touches on sulphite allergies which very few people actually have. Most suffer from a sensitivity rather than a true allergy. If you or anyone else you know suffers from gluten related allergies, there are many resources on the web to help identify what contains gluten, and what may come into contact with gluten during processing. Very interesting to note that even some flavoured coffee is processed with wheat, however whole bean coffee should be safe. Whoulda thunk it?