Bitter orange peel oil is cold-pressed from the outer rind of Citrus aurantium var. amara and, like sweet orange, is limonene-dominant (85-95%), but carries a sharper, more resinous bitterness from trace sesquiterpenes. Uniquely among the three bitter-orange-derived oils, the peel oil has been investigated for gastric tissue effects: rat models show that both the essential oil and its principal component d-limonene significantly accelerate healing of induced ulcers, with cure rates of 44% and 56% respectively, mediated through VEGF-driven angiogenesis and increased mucus secretion.^[1] Phytochemical profiling further confirms significant antioxidant, anticholinesterase, and antidiabetic enzyme-inhibitory activities.^[2]