Bromelain is an enzyme found in pineapple juice and in the pineapple stem. People use it for medicine. Advertisement This 21st century research is supported by pineapple's longstanding use by the indigenous people of the Americas, who used the juice as an anti-inflammatory, diuretic and … So far, there’s no research evidence that eating pineapple or drinking pineapple juice can cause miscarriage or that it can induce labor at term. Forms and doses Bromelain can be purchased in pill or tablet form for oral ingestion. One research study even found that bromelain -- when combined with trypsin -- eased the pain associated with breast engorgement as a result of nursing [source: Wellness Trader]. Bromelain is used for reducing swelling (inflammation), especially of the nose and sinuses, after surgery or injury. Bromelain is also used as a digestive aid, for osteoarthritis, and to reduce soreness in aching muscles. In summary, pineapple juice contains the enzyme bromelain, which is thought to contribute to cervical ripening, but very little research exists on this topic. Everything I've found online says it has not been proven safe or unsafe during pregnancy so consult your care provider before taking. FYI, bromelain is the enzyme found in pineapple (that "supposedly" might help induce labor, lol).