Eden Apothecary · Herb Profile
Turnera diffusa
Pronounced Damiana: dam-ee-AH-nah. Turnera diffusa: tur-NAIR-uh dif-YOO-suh.
Warm and dry, stimulating: an aromatic bitter nervine and reproductive tonic that warms cold, spent depletion, lifts atonic depression, and rekindles low libido and nervous exhaustion.
Avoid in pregnancy. Damiana carries a long traditional reputation as an emmenagogue and abortifacient, its effects on the female hormonal system and the pregnant uterus are uncharacterized, and there are no adequate controlled human safety data. Modern safety references therefore place it among herbs to avoid during pregnancy. (AHPA Botanical Safety Handbook, 2nd ed.; Mills and Bone, The Essential Guide to Herbal Safety; Brinker, Herbal Contraindications and Drug Interactions.)
Insufficient data; avoid. There are no controlled studies of Turnera diffusa during lactation, it is not known whether its constituents pass into breast milk, and infant safety is uncharacterized; prefer better-studied alternatives. (AHPA Botanical Safety Handbook, 2nd ed.; Mills and Bone, The Essential Guide to Herbal Safety; NCCIH consumer guidance on unstudied botanicals in lactation.)
Not established for internal use in infants and children; no pediatric safety data exist, and the stimulating action plus the cyanogenic-glycoside and arbutin content make it inappropriate for young children. Keep out of reach of children. (AHPA Botanical Safety Handbook, 2nd ed.; Mills and Bone, The Essential Guide to Herbal Safety.)
Damiana is stimulating and can cause insomnia, restlessness, or a mild caffeine-like over-stimulation if taken late in the day or in large amounts, and it is best avoided in hot, agitated, anxious-wired, or insomniac states. It has mild blood-sugar-lowering activity, so people with diabetes or hypoglycemia and those on glucose-lowering drugs should monitor their blood sugar. The leaf contains small amounts of a cyanogenic glycoside and of arbutin (a hydroquinone precursor), so ordinary tea and tincture doses are considered safe but large or prolonged high doses should be avoided: rare case reports describe convulsions and strychnine-like paroxysms after roughly 200 grams (about 8 ounces) of concentrated extract. Being drying, it is best paired with a moistening herb in dry constitutions. It has a traditional reputation as an emmenagogue and abortifacient and must be avoided in pregnancy.
Pregnancy (traditional emmenagogue and abortifacient; avoid). Hot, feverish, acutely inflamed, or strongly agitated and insomniac states, which its warming stimulation aggravates. Diabetes and hypoglycemia without blood-sugar monitoring, given its glucose-lowering activity. Avoid large or prolonged high doses (cyanogenic glycoside and arbutin content). Known hypersensitivity. Reserve any use in dry, depleted, over-heated constitutions to careful, moistening-paired dosing.
Turnera diffusa is not currently listed as at-risk or endangered by United Plant Savers; it is a common subshrub across its range. It is, however, harvested largely from the wild in Mexico to supply the aphrodisiac, tea, and liqueur trade, so prefer cultivated or verifiably responsibly wild-harvested leaf, gather the leaf without uprooting the plant, and buy from suppliers who document sustainable sourcing.
Not named in the canonical biblical texts. Turnera diffusa is a New World plant native to the Americas (southern Texas through Mexico, Central and South America, and the Caribbean) with no Old World or Mediterranean pedigree; its documented tradition is Mesoamerican and Mexican folk medicine (the name 'damiana' is of Spanish colonial origin), later adopted and recorded by the nineteenth-century Eclectic and Physiomedical physicians of North America.
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