Pineapple, Ananas comosus

Origin: Group of enzymes found in pine­apple that break down protein. Dosage: Capsules and tablets; take 500 mg to 2,000 mg three times a day between meals.

Claims: Decreases pain and swelling of rheumatoid arthritis (RA) and osteoarthritis, and increases mobility.

What we know: There is some evidence that enzymes like bromelain have pain-relieving and anti-inflammatory effects comparable to NSAIDs.

Studies: A 2005 study done in Germany showed that bromelain activated immune cells that fight infection.

 Bromelain can cause stomach upset and diarrhea and should be avoided if you are allergic to pineapples. It can also increase the effect of blood-thinning medicine.