Calea Zacatechichi

For those who want to go below the page: botany, chemistry, then four voices, each one named. ◆ what the tradition left in writing, ◇ what research has measured, ● what our dreamers tell us, ☾ what the House says.

Botany and identification

Calea ternifolia Kunth is the accepted name; Calea zacatechichi Schltdl., the name everyone searches for, is its synonym. She is an Asteraceae, of the chamomile and daisy family: a branched shrub about 1.5 m tall (rarely up to 3 m), with small oval leaves crisped at the edges and small yellow, sometimes whitish flowers. The underside of the young leaves turns violet, and the foliage is an intense green (Rätsch). She grows in Mexico and Central America.

Her identification is delicate: Calea is easily confused with close species of the same genus, and the trade sometimes sells another plant under her name. Hence the weight of a traceable supply. Ours comes from the Puebla region of Mexico, as whole wild-harvested leaves.

Phytochemistry: a plant that keeps her secret

No hallucinogenic constituent has been isolated from Calea (Schultes, Hofmann & Rätsch, Plants of the Gods, p. 38). She holds sesquiterpenes (caleicines, caleochromenes, germacranolides), chlorogenic acid and a flavone, acacetin. The germacranolides also help classify the species of the genus (Ferreira et al. 1980, cited by Rätsch). What acts on the dream, and how, remains unknown.

◆ The documented tradition

Among the Chontal of Oaxaca, in southern Mexico, the plant is called thle-pela-kano, "leaf of god". Healers take her to obtain messages during the dream: to find the cause of an illness, a distant person, a lost object (Mayagoitia, Díaz & Contreras 1986, after José Luis Díaz's fieldwork). For them, the plant "clarifies the senses" (Schultes, Hofmann & Rätsch, Plants of the Gods, 2001, p. 38). Christian Rätsch describes the bitter decoction of the curanderos and calls the practice oneiromancy; the fresh herb is sometimes slipped under the pillow (Encyclopedia of Psychoactive Plants, 2005, p. 117).

The gesture the books describe: drink the infusion, lie down in a dark room, sometimes smoke a cigarette of the leaves. The sign that the plant is working: you feel your pulse, the beating of your heart (Schultes, p. 79; Dale Pendell, Pharmako/Poeia, 1995, p. 115). The Chontal tell "good" plants from "bad" ones, and Díaz described chemical races, some of them inactive (Rätsch, p. 117; Pendell, p. 115).

The name zacatechichi comes from Nahuatl zacatl, "grass", and chichic, "bitter": the bitter herb. She is also called zacate de perro and, in English, Aztec dream grass (Rätsch; Schultes). This written memory comes from the ethnographic work of the 1960s and 1970s (Thomas MacDougall, then Díaz).

◇ The studies: what they say about the effects

One human study looks at dreaming: Mayagoitia, Díaz & Contreras (1986), Journal of Ethnopharmacology 18:229-243 (PubMed 3821139). In healthy volunteers, double-blind, Calea was compared with a placebo and with diazepam. During a controlled nap it increased light sleep and spontaneous awakenings, and dream reports were significantly more frequent than with the placebo and than with diazepam; the authors read this as hypnagogic imagery in light sleep. The volunteers also showed longer reaction times and a changed estimate of elapsed time. The abstract does not give the number of participants.

In animals: an antinociceptive effect in mice (Sałaga et al. 2016); anxiolytic-like and antidepressant-like effects in rodents, with more hippocampal gamma oscillations during REM sleep (Martínez-Mota et al. 2020). Toxicology gives signals worth knowing: in rats, lower platelets and white cells and higher liver enzymes (González-Yáñez et al. 2019); in cultured human kidney cells, cytotoxicity at low doses (Mossoba et al. 2016).

● Our dreamers: reviews and stories

Of 269 reviews published on INFUSE, 40 tell of a night (read one by one in September 2026; a review can say several things): 22 speak of more vivid dreams, 10 of better recall, 6 of a lucid dream, 5 of better sleep, and 5 noticed nothing in their dreams. 16 of them mention the bitterness.

"That same night I had a lucid dream which was very insightful." — Neyda

"Personally I believe that it must be integrated with good preparation and predisposition for lucid dreaming. Alone it is not enough…" — Mauro

"it still has no effect in terms of dreams... terribly bitter taste, but from the 4th day you get used to it a little" — Cinzia

☾ The House

Our own words, from the very first page: "One of the greatest Master Plant Medicine for Dreaming, Calea Zacatechichi awakens the Dreamer inside of us. She is known to offer spectacular, vivid, memorable dreams at night, while enhancing our ability to self-reflect and journey within." We suggest a 3 to 5 day diet to know her fully, a teaspoon of leaves per cup, and breaks between cycles. As a tea she is very bitter; honey, lemon or mint help. In a smoking blend she stays a companion by day as well as by night. And what she opens, we wrote this way: "Calea Zacatechichi opens the door to discover the True Wishes of our Souls, whispering to us our reason to be here on Earth…"

Safety, side effects and legal status

Calea is an evening plant, kept for bedtime, with no driving or machinery afterwards. She is taken in cycles of a few nights, with breaks. Her bitterness can bring mild nausea at high strength; at high doses, the animal literature describes salivation, nausea and digestive discomfort. The toxicology signals above (blood, liver, kidney, in animals or cell cultures) are a reason to keep to small, spaced amounts. Allergy to Asteraceae (chamomile, echinacea, ragweed): take care. Pregnancy, breastfeeding, children: avoid, for lack of data. With sedative or psychotropic medication: ask your doctor first.

Freely sold in France. Check the law in your country. This page documents a traditional dream use; Calea is not intended to diagnose, treat or prevent any disease.

Sources: Mayagoitia L., Díaz J.L., Contreras C.M. 1986, Journal of Ethnopharmacology 18:229-243 (PubMed 3821139) · Schultes R.E., Hofmann A., Rätsch C., Plants of the Gods (2001), pp. 38, 78-79 · Rätsch C., Encyclopedia of Psychoactive Plants (2005), pp. 116-118 · Pendell D., Pharmako/Poeia (1995), pp. 114-115 · Sałaga M. et al. 2016; Martínez-Mota L. et al. 2020; González-Yáñez M.G.E. et al. 2019; Mossoba M.E. et al. 2016. Reviews: INFUSE database, September 2026.