Huachuma, also known as San Pedro, is a tall Andean cactus that contains mescaline, a psychoactive compound similar to that found in peyote. For over 20 years, thousands of Americans have traveled to South American countries like Peru, Ecuador, and Brazil to experience ayahuasca, a traditional brew containing DMT, a powerful psychedelic substance. Researchers are now exploring how both ayahuasca and mescaline might help with mental health conditions such as depression and addiction. Huachuma, too, is gaining attention in the West, with ceremonies and retreats growing in popularity across the U.S., Latin America, and Europe. Native to the Andes, huachuma is scientifically known as Echinopsis pachanoi. Its use in healing dates back thousands of years, with evidence suggesting it was used as early as 8,000 years ago in Peru. Carvings of the cactus appear in ancient sites like Chavín de Huántar, a 3,000-year-old ceremonial complex in northern Peru. In traditional Andean healing, curanderos—spiritual healers—train for years, often within families, and use huachuma in rituals called mesa, where they drink the tea to understand a patient’s condition. This deep-rooted tradition highlights the plant’s historical and cultural significance. Huachuma ceremonies differ from other psychedelic experiences in their pacing and structure. Unlike faster-acting substances like ketamine, mescaline’s effects can last up to 11 hours. A typical ceremony begins with drinking the bitter tea in the morning, with effects gradually building over the day. Participants engage in walking, resting, and talking together, with the session ending near sunset. This slow, deliberate process mirrors the long cultivation time of the cactus itself. Many healers emphasize treating huachuma with respect, akin to an elder or teacher, rather than a quick solution to emotional pain. The growing interest in huachuma is part of a broader resurgence in psychedelic research and therapy. Surveys show that many users report lasting improvements in mental health after their experiences. People from diverse backgrounds—veterans, healthcare workers, and those struggling with grief—turn to huachuma after conventional treatments have failed. Unlike other psychedelics, which can induce intense visions and emotional upheaval, huachuma offers a gentler experience. It is often called “the grandfather” for its calming, guiding presence. Users describe it as a journey that quiets the mind, allowing for deeper reflection and emotional healing. Despite its potential benefits, huachuma is not without risks. Mescaline can raise heart rate and blood pressure, making it unsuitable for people with certain health conditions or on specific medications. In the U.S., mescaline is classified as a Schedule 1 controlled substance, meaning its use is illegal, even for medicinal purposes, despite the cactus itself being legal to grow. Proper preparation and guidance are essential, as potency varies between cacti and dosing can be inconsistent. Ethical use also involves respecting the plant’s cultural origins, supporting Andean communities, and learning from trained practitioners rather than relying on online sources. As with any powerful substance, patience and reverence are key to honoring the tradition and the plant itself.