Aloe Vera

None well-documented

Aloe Vera ( _Aloe vera_, syn. _Aloe barbadensis_) is a fleshy-leaved succulent native to the Arabian Peninsula that has been cultivated globally for thousands of years for its medicinal properties. In Arizona, it is planted throughout the Phoenix metro, Tucson, and the low-desert corridor as a low-maintenance landscape succulent and a practical household plant, kept on windowsills and in gardens for immediate burn and skin-soothing use. It grows as a rosette of thick, serrated gray-green leaves and blooms in late winter, sending up a 2 to 3 foot stalk of tubular yellow-orange flowers visited by hummingbirds.

As a landscape plant, Aloe Vera poses essentially no allergy risk. Its flowers are pollinated by birds and not wind-dispersed. It is not found in Arizona pollen panels and is not a recognized seasonal allergen. The allergy concern associated with Aloe Vera arises almost entirely from direct contact with the fresh plant’s latex, which contains anthraquinone compounds including aloin and aloe-emodin. When the leaf is cut and this latex contacts skin, it can cause irritant or allergic contact dermatitis: itching, redness, blistering, and crusting appearing 24 to 72 hours after application.

The inner clear gel, which is the portion processed for commercial products, is generally better tolerated. However, allergic contact dermatitis has been confirmed even from processed gel in patch-test–confirmed case reports, and contact urticaria from fresh aloe juice is documented. For most Arizona homeowners and gardeners, landscape proximity to aloe plants carries no meaningful allergy risk. The practical precaution applies when using fresh-cut leaves medicinally: patch test on unbroken skin before widespread application, and avoid applying fresh latex to damaged or inflamed skin.