Root of the plant is the major source of beneficial compounds in the rehmannia. It is used fresh, dried or processed into herbal preparations. Leaves serve as a topical application for skin conditions, such as psoriasis or eczema. Other than for decorative purposes, the use of the rehmannia flowers is not known.
As a rule, rehmannia root is sold in capsules, tablets, dried extracts, and powder. Rehmannia is a compound of a variety of herbal blends and formulas, such as those for female health enhancement, in particular.
Rich in amino acids,Vitamins (A, B, C), cerebroside, melittoside, dammelittoside, and rehmaglitin, rehmannia is known as anti-inflammatory and anti-fungal herb. It is also known as a blood tonic and purifier – thanks to its astringent properties provided by the chemical content. The rich sweet starchy content of the rhizome has been used in Chinese herbal medicine as a cloying agent – improving the function of the liver and digestion (by stimulating bloating and gas). Other benefits associated with rehmannia include anti-hepatotoxic, anti-rheumatic, anti-eczema, diuretic, hypoglycemic, laxative and cardiotonic actions.
Iridoid glycosides are the major constituents in the root. They stimulate the production of anti-inflammatory hormones and work well in treating conditions associated with hormone deficiencies.
Rehmannia is majorly associated with adrenal gland and kidney conditions. It decreases adrenal suppression of steroid hormones and works well against autoimmune disorders (fibromyalgia, rheumatoid arthritis, and multiple sclerosis).
Restorative properties of rehmannia have been known for centuries in Chinese herbal medicine. Today, it is commonly used in the patients with broken bones – for repairing damaged center, broken bones, and enhancing the regeneration of muscles and tissues.
The vitamin content make rehmania an effective remedy for fever and colds, inflammation and dizziness.
Women with severe PMS and menstrual disorder symptoms will find rehmannia helpful for the major troubles of the condition. Its action stimulates hormonal balance, reduces bleeding, relieves anemia, headaches, and regulates menstrual cycle.
Astringent properties of Rehmannia make it useful in treating external and internal bleeding – it stops blood in ulcers, wounds, nasal and vaginal bleeding. Moreover, the herb will purify the blood and reduce the pressure in it.
Chinese herbalist use rehmannia as multi-purpose tonic. Its action improves kidney function, urinary tract health (especially in men), cardiovascular system and cholesterol levels, blood circulation, digestion, deafness, vertigo and sexual health. Tonic properties make rehmannia an anti-aging herb. The animal study was based on controlling life extending effects of the herb and used old rats. Those that were associated with rehmannia usage showed an increased stamina and moved more on the running-wheel as compared to those that did not consume the herb.
When applied to skin, rehmannia treats eczema, psoriasis, wounds and cuts.
Preagnant or breastfeeding women should not use rehmannia. Some rare side effects include bloating, nausea, and loose bowel movements.