Reviewed on 6/11/2021
Other Name(s):

Cambui, Myrcia multiflora, Myrcia salicifolia, Myrcia uniflora, Pedra Hume, Pedra Hume Caa.


Myrcia is a medium-sized shrub that grows in parts of central and southeastern Brazil. Some Myrcia species also grow in other South American countries, including Bolivia, Peru, and Paraguay.

People take Myrcia by mouth for diabetes, diarrhea, bloody diarrhea, inflamed intestines, hemorrhage, high blood pressure, and mouth ulcers.

How does it work?

Myrcia might reduce how much sugar is absorbed by the stomach. This might help lower post-meal blood sugar levels in people with diabetes. Myrcia also reduces thyroid hormone production.


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Uses & Effectiveness

Insufficient Evidence to Rate Effectiveness for...

  • Diabetes. Early research suggests that drinking an herbal tea containing Myrcia uniflora daily for 56 days does not improve blood sugar or insulin levels in people with or without diabetes.
  • Diarrhea.
  • Bloody diarrhea.
  • Inflamed intestines.
  • Hemorrhage.
  • High blood pressure.
  • Mouth ulcers.
  • Other conditions.
More evidence is needed to rate Myrcia for these uses.

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).

Side Effects

There isn't enough reliable information available about Myrcia to know if it is safe.


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Special Precautions & Warnings

Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking Myrcia if you are pregnant or breast feeding. Stay on the safe side and avoid use.

Underactive thyroid (hypothyroidism): Myrcia might decrease the production of thyroid hormone. This might worsen symptoms in people who already have low thyroid hormone levels.


Levothyroxine (Synthroid, Levothroid, Levoxyl, and others)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Myrcia might reduce how much thyroid hormone the body produces. Levothyroxine is used to increase thyroid hormone levels in people whose levels are too low. In theory, taking Myrcia with levothyroxine might reduce how well levothyroxine works.


The appropriate dose of Myrcia depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for Myrcia (in children/in adults). Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.

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Ferreira AC, Neto JC, da Silva AC, et al. Inhibition of thyroid peroxidase by Myrcia uniflora flavonoids. Chem Res Toxicol 2006;19(3):351-55. View abstract.

Matsuda, H., Nishida, N., and Yoshikawa, M. Antidiabetic principles of natural medicines. V. Aldose reductase inhibitors from Myrcia multiflora DC. (2): Structures of myrciacitrins III, IV, and V. Chem Pharm Bull (Tokyo) 2002;50(3):429-31. View abstract.

Pepato MT, Oliveira JR, Kettelhut IC, Migliorini RH. Assessment of the antidiabetic activity of Myrcia uniflora extracts in streptozotocin diabetic rats. Diabetes Res 1993;22(2):49-57. View abstract.

Russo EM, Reichelt AA, De Sa JR, et al. Clinical trial of Myrcia uniflora and Bauhinia forficata leaf extracts in normal and diabetic patients. Braz J Med Biol Res 1990;23(1):11-20. View abstract.

Yoshikawa M, Shimada H, Nishida N, et al. Antidiabetic principles of natural medicines. II. Aldose reductase and alpha-glucosidase inhibitors from Brazilian natural medicine, the leaves of Myrcia multiflora DC. (Myrtaceae): structures of myrciacitrins I and II and myrciaphenones A and B. Chem Pharm Bull (Tokyo) 1998;46(1):113-9. View abstract.

Zoghbi MGB, Andrade EHA, da Silva MHL, Carreira LMM, Maia JGS. Essential oils from three Myrcia species. Flavour Fragr J 2003;18:421-424.