Pineapple juice powder. Pineapple juice is extracted from the fresh fruit pineapple, Ananas comosus. The pineapple is native to South America and is now cultivated in tropical environments all over the world 1. Fresh pineapple is a source of bromelain, an enzyme that digests protein 2. It is also an excellent source of vitamin C and manganese, and a source of dietary fiber, thiamin, vitamin B6, folate, magnesium, potassium and copper 3.