Doctor's Best® Best Bromelain (3000GDU) is a health supplement that promotes cardiovascular and joint health. Its main ingredient is bromelain, which is a protein-digesting enzyme that is found in pineapple. The bromelain used in this supplement is the most potent form available. “3000 GDU” is a measure of the regulation of enzymatic potency and reflects the high quality of the bromelain contained in this supplement. This enzyme is known to aid digestion and has positive effects within the body, such as in the cardiovascular system and joints.