Aurantium Oil (Orange Peel Essential Oil) Classic Formulas

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Aromatically regulates Qi and harmonizes the Middle Burner - used for nausea, poor appetite, belching, and epigastric fullness when the volatile peel fraction is the main active portion and the presentation resembles the Chen Pi citrus-peel pattern.
Transforms Dampness and resolves phlegm - used as a light peel-derived adjunct for productive cough, chest congestion, and phlegm accumulation that arise when Spleen dysfunction generates damp-phlegm for the Lungs.
Freshens and opens the Lung Qi aspect of citrus formulas - employed more as an aromatic essence or external inhalant than as a major standalone decoction herb when heaviness, foul turbidity, or stale phlegm sensations predominate.
Helps prevent cloying stagnation in rich foods or tonifying combinations - the concentrated citrus volatile fraction keeps movement in the upper digestive tract and supports downward movement of rebellious Stomach Qi.

Er Chen Tang (二陈汤) - although the classical formula uses Chen Pi rather than isolated orange oil, it is the closest peel-lineage reference for drying Dampness, transforming phlegm, and rectifying Qi in cough with copious sputum.
Wen Dan Tang (温胆汤) - uses citrus peel to harmonize the Stomach and Gallbladder, descend rebellious Qi, and resolve phlegm-heat with nausea, vexation, and chest oppression; it is the clearest formula analogue for the aromatic orange-peel profile.
Ju Pi Zhu Ru Tang (橘皮竹茹汤) - from Jin Gui Yao Lue, this citrus-peel formula redirects rebellious Stomach Qi for nausea, retching, and hiccup, offering the closest classical digestive reference for Ju Zi Xiang Jing.

IMPORT NOTE: Ju Zi Xiang Jing (橘子香精) / Oleum Aurantii appears in general materia medica lists as orange essence or orange peel oil rather than as a major standalone decoction herb. The TCM action profile in this record is therefore inferred from the orange-peel lineage headed by Ju Pi / Chen Pi.
DRUG PART NOTE: Historical pharmacognosy sources describe Oleum Aurantii and Oleum Aurantii Corticis as orange oil expressed from the fresh peel, confirming peel rather than pulp or seed as the relevant medicinal source material.
Chen Pi references in Sacred Lotus and Me & Qi describe the nearest classical analogue as warm, acrid-bitter, Lung-Spleen-Stomach regulating, Damp-drying, and phlegm-transforming; those properties are used here transparently because an independent classical monograph for the oil itself is sparse.