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Whitebridge Pet Botanics Freeze Dried Training Rewards are a meaty treat that contains just a single ingredient, real beef liver. The beef liver treats are made via the freeze-drying method, in which moisture is removed by a vacuum-like process at freezing temperatures. Freeze drying is a natural way to keep foods fresh and extend shelf life without using preservatives. Pet Botanics Freeze Dried treats contain no BHA, BHT, artificial preservatives or artificial colors.