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Rehmannia may lower blood sugar and therefore interact with antidiabetic drugs. Since taking rehmannia may affect blood sugar levels, people with diabetes are typically advised to avoid or be very careful taking rehmannia, and people who have upcoming surgery should stop taking rehmannia at least two weeks before or sooner depending on doctor recommendations. Rehmannia is not recommended for children, pregnant women or breastfeeding women. The herb is also not recommended for people with chronic liver disease or a gastrointestinal disease.
When it comes to TCM, it’s key to do your research and visit a practitioner who is well-trained and certified. All Chinese herbal remedies like rehmannia should be taken under professional supervision. There is currently no established recommended safe dose of rehmannia so speak with your health care provider about a proper dosage for your needs. Many rehmannia supplements contain somewhere between 55 to 350 milligrams of the herb.
I also want to note that Chinese herbal products manufactured outside of the U.S. can be mislabeled, contain dangerous additives and sometimes have trace amounts of dangerous heavy metals. Look for high-quality, pure products made from trusted and certified retailers, or work directly with an herbalist.
According to TCM, this herb is typically contraindicated if you have diarrhea or abdomen distention due to spleen deficiency. Side effects of this herb that have been report include GI discomfort (including mild nausea, loose bowels, flatulence), allergy, headache, dizziness, heart palpitations, fatigue and vertigo. *
