Peru Balsam (Myroxylon pereirae)
What Is Peru Balsam?
Peru Balsam is the common name for Myroxylon pereirae, a plant of the Fabaceae family, native to Central and South America. The material in circulation is trunk balsam — a resin, tapped from the living tree. Peru Balsam is the name in everyday use, while Myroxylon pereirae is the name that identifies it unambiguously across languages, trade documents and safety literature. Its character is described as rich vanilla-cinnamon with a smoky, almost tar-like base, which is often how the raw material is checked for quality.
Peru Balsam entered the reference literature through use rather than through chemistry. Older sources are concerned with where it grows, when it is gathered and how it is prepared, questions that still shape the material on sale today. Beyond its practical use it carries cultural associations — Central American balsam of protection and healing.
Today most searches for Peru Balsam come from people reading about rash, wound healing, congestion and seasonal allergies, or checking how it sits alongside a medication they already take. The use most often documented in the literature is traditional antiparasitic and antiseptic wound salve, followed by used historically in scabies and nappy rash preparations.
How Does Peru Balsam Work?
Peru Balsam works as a mixture rather than a single isolated compound, and its profile is usually described by the class of constituents present in trunk balsam rather than by one marker molecule.
Traditional practice described Peru Balsam in terms of taste, warmth and preparation rather than molecules — a working vocabulary that predicted which extractions were worth making long before any compound was isolated.
The research base is developing: there are human trials, though sample sizes and designs vary, and this profile cites 1 source. Reported findings centre on contains 50–65% cinnamein (benzyl benzoate and benzyl cinnamate); the crude balsam is a standard marker allergen in the baseline patch test series. Where research exists, it examines traditional antiparasitic and antiseptic wound salve, used historically in scabies and nappy rash preparations and expectorant in cough formulations. These are areas of study, not established outcomes, and results differ by preparation and dose.
How the plant is prepared changes what you actually get. Its constituents move readily into water and alcohol — so a preparation made in another medium will not carry the same fraction of the plant, which is why traditional recipes specify one over another.
The reason Peru Balsam is treated as its own entry rather than a substitute for a related plant is proportion: related species share several of these compound classes, but not in the same ratio or concentration.
Because these constituents are processed by the same pathways that handle many medicines, Peru Balsam is documented as interacting with topical medications. That is a question of shared metabolism rather than of potency, and it is the main reason the plant is listed in interaction references at all.
Dose, plant part and growing conditions all shift the constituent profile, so two products carrying the name Peru Balsam can differ substantially; this is why reference entries specify trunk balsam and, where they exist, standardisation markers.