Persea americana

Persea americana leaves have long been used by several indigenous groups as a medicinal infusion or topical poultice. Among the Mapuche of southern Chile, Bennett et al., 2021 report that a mild tea of fresh leaves is drunk to relieve stomach cramps and mild fevers, while a decoction of the same material is applied to inflamed joints. In central Mexico, the Nahua people prepare a decoction of dried leaves to treat diarrhea and abdominal pain, as documented by García et al., 2019. In southwestern Nigeria, the Yoruba use a poultice made from crushed avocado leaves to soothe skin wounds and reduce swelling, a practice noted by Okafor et al., 2018. In each case, the leaves are the primary plant part used, and the preparations involve either infusions, decoctions, or macerations.

A simple, safe leaf tea can be made at home. Take 5 g of dried avocado leaves (about one tablespoon) and steep them in 250 ml of boiling water for 10 minutes. Strain, allow to cool slightly, and drink one cup. Because the leaves contain persin, a compound that can be toxic in large doses, it is advisable to limit consumption to one cup per day and to avoid the tea during pregnancy or lactation. If you have a history of heart or kidney disease, consult a healthcare professional before using avocado leaf preparations.

The therapeutic effects of avocado leaf tea are supported by several well‑established phytochemicals. Persin, a triterpenoid, has been shown to possess antimicrobial and anti‑inflammatory properties. The leaves also contain saponins, which can help reduce inflammation and support immune function. Flavonoids such as quercetin and kaempferol contribute antioxidant activity, while the vitamin E content adds to the overall anti‑oxidative potential of the infusion. These constituents together provide a plausible biochemical basis for the traditional uses of the plant in treating gastrointestinal discomfort, fever, and skin inflammation.

Modern research continues to explore the benefits of avocado leaf extracts. Recent in‑vitro studies confirm anti‑inflammatory and antimicrobial activity, and commercial dietary supplements containing standardized avocado leaf extract are now available in health‑food stores. Traditional use remains common in many rural communities, and the plant’s medicinal potential is increasingly recognized by both ethnobotanists and pharmacologists.

Common products:
Edible fruit and seed oil are the principal commercial products of Persea americana. Seed oil is produced by drying, dehulling, and mechanical pressing of the avocado seed; it is refined for food use and sold as a cosmetic-grade oil. Dried, milled seed and seed meal are used as natural brown dyes and as tannin extracts for leather tanning.

Industrial and craft applications:
Avocado seed yields brown dyes for protein fibers and leathers via aqueous or ethanolic extraction of phenolics and caramelization products from seed powders or extracts. Ground seed and seed meal are used as leather tanning agents or dye concentrates in craft and small‑scale dyeing.

Food and beverages (non-medicinal):
Refined avocado seed oil is used as a cooking and frying oil due to its oxidative stability and high smoke point; it is also used as an ingredient in confectionery and bakery applications to improve gloss and mouthfeel. Whole seed flour is used as a low‑starch, brown‑pigmented flour in specialty foods to partially replace wheat flour in baked goods.

Colorants and tanning:
Seeds and seed meal supply brown dyes for wool, silk, and leather. They contain hydrolyzable tannins, gallotannins, and flavonoid phenolics that bind to protein fibers and collagen. The brown hue derives from phenolic oxidation and seed pigments. As tanning agents, seed extracts function as vegetable tannins, providing brown shades and moderate leather shrinkage.

Properties relevant to use:
Avocado seed oil is high in monounsaturated fatty acids (oleic acid commonly reported as 50–70% of total fatty acids) and has iodine values around 80–95 g I2/100 g and saponification values near 180–195 mg KOH/g; smoke points for refined oil typically exceed 250 °C. Seed tannins are primarily hydrolyzable (gallotannins), with pH‑dependent solubility and moderate fixation on protein fibers. Seed moisture ranges widely with cultivar and maturity; seed meal is low in starch and protein relative to conventional oilseed meals.

Sustainability and sourcing:
Global production is dominated by Mexico and other Latin American producers, with horticulture and postharvest research supported by a network of international avocado collections (e.g., USDA Tropical Plant Genetic Resource and Disease Research Unit, the International Avocado gene bank at CATIE, and the National University of Mexico) that underpin breeding and oil quality improvement. Fruit waste streams (seeds and peels) are increasingly valorized to supply dye and tannin feedstocks.

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