Are your Boost Flavours Gluten Free Kelsey August 03, 2020 10:56 Updated Yes. All our Natural Beer Flavour Boosts are gluten free. Related articles What is in the Cider Essence and Sweetener? Which countries do the fruit concentrates in Mangrove Jack's Ciders originate from? My Gluten Free beer is too hazy, how can I fix this? Adding Hops To Brewer's Series Kits Can brown sugar be used with the kits?