What is bromelain? Bromelain is a protein-splitting enzyme derived from pineapple. What are digestive enzymes? Digestive enzymes are proteins that are involved in breaking down nutrients into smaller building blocks in the body. There are many different digestive enzymes – each with a different function. Ultra Bromelain Tablets This product from NaturesPlus contains 60 tablets of 1500 mg of bromelain per tablet. Hint: Food supplements are not intended to be a substitute for a balanced and varied diet.