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? Adding Hops To Brewer's Series Kits My Gluten Free beer is too hazy, how can I fix this? What is the difference between Liquid Malt Extract and Liquid Malt Enhancer?