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Rehmannia is a plant. The root and parts that grow above the ground are used to make medicine. Rehmannia is commonly found in herbal combinations used in Traditional Chinese Medicine and Japanese Medicine.
Rehmannia is used for diabetes, tired blood (anemia), fever, weakened bones (osteoporosis), and allergies; and as a general tonic.
There is not enough information to know how rehmannia might work for any medical condition. However, some chemicals in rehmannia seem to affect the immune system and might reduce pain and swelling. Some chemicals in rehmannia also seem to lower blood sugar levels.