The ingredients of Japanese incense: agarwood, sandalwood, benzoin and more

Japanese incense is built from a working set of six to eight raw materials, layered by scent and burn behavior rather than used alone: agarwood (jinkō), sandalwood (byakudan), clove (chōji), benzoin (ansokukō), frankincense (nyūkō) and storax (sokugō), bound with charcoal powder, saltpeter and a plant gum into sticks, or kneaded with honey and dried plum pulp into nerikō pellets. None of these plants grows natively in Japan in commercial quantity. Agarwood has arrived from Vietnam, Cambodia and Indonesia since at least the sixth century; sandalwood chiefly from India and later Indonesia; benzoin from Sumatra and Laos by way of Chinese trade routes that gave it the name ansokukō, after Anxi, the old name for Parthia. The blend, not any single ingredient, defines a maker’s house style, and benzoin’s job within it is mostly structural: holding the more volatile top notes in place over months of shelf life.

Jinkō: agarwood as the backbone

Agarwood is not a wood species but a resin-saturated defense response inside Aquilaria trees, triggered by wounding or fungal infection. Unaffected wood is pale and nearly odorless; resin-laden wood is dark, dense and sinks in water, and it is this fraction that Japanese incense makers prize. The Muromachi-period kōdō (“way of incense”) tradition classified agarwood into six loosely origin-linked grades known as rikkoku, with kyara as the rarest and most expensive. Historically the best material moved through Vietnam and Cambodia, and Nihon Shoki, Japan’s eighth-century chronicle, records a log of fragrant wood washing ashore on Awaji Island in 595 CE — the country’s first recorded encounter with agarwood. Trade routes through Vietnam remain central to supply today, though wild Aquilaria stocks are now protected under international trade controls.

Byakudan: sandalwood as the everyday base

Sandalwood, Santalum album, supplies a softer, creamier, longer-lasting note than agarwood and is far more affordable, making it the base of most everyday Japanese incense rather than the ceremonial grades. The heartwood is ground to a fine powder and its scent comes largely from santalol sesquiterpenes locked in the wood’s oil. Mysore sandalwood from India was the historic reference standard for centuries, prized enough that the Indian government eventually restricted its export; Indonesian and, more recently, Australian sandalwood have filled much of the resulting gap, though Japanese makers generally regard them as a different, thinner scent rather than a direct substitute.

What does ansokukō, the Japanese name for benzoin, contribute?

Ansokukō is written with characters borrowed from the Chinese anxixiang, a name referencing Anxi, the old Chinese term for Parthia, an early node on the trade routes that carried benzoin eastward. The material itself comes from wounded Styrax benzoin trees in Sumatra and Styrax tonkinensis in Laos and northern Vietnam, tapped for a balsamic resin rich in benzoic and cinnamic acid esters. In a Japanese blend, benzoin rarely reads as a distinct note the way agarwood or clove do; instead it acts as a fixative, thickening a nerikō paste and slowing evaporation of the lighter, more volatile aromatics around it. Chinese materia medica had already absorbed the material under the anxixiang name centuries before it reached Japan, a history covered in more depth in our piece on benzoin in Chinese materia medica.

Frankincense and storax: the resins in the cabinet

Nyūkō, frankincense, is Boswellia resin tapped in Oman, Somalia and Yemen, and appears in Japanese blends for its clean, slightly citrus-resinous lift, though it plays a smaller role than in Chinese temple incense or Arabian bakhoor. Sokugō, usually translated as storax, has a more tangled history: in older Japanese and Chinese pharmacopoeias the term pointed to resin from Liquidambar orientalis in Anatolia, a material related to but botanically distinct from the styrax-tree benzoin discussed above, and the two are still regularly confused under overlapping English names. The distinction is worth keeping straight when reading old incense manuals, and we untangle it in benzoin versus styrax/storax and describe the Anatolian material itself at storax.

Clove, cinnamon and the rest of the spice rack

Beyond the woods and resins, Japanese incense recipes lean on a small spice cabinet: chōji (clove buds, from Syzygium aromaticum, historically sourced from the Moluccas), keihi (cinnamon or cassia bark), and smaller amounts of star anise, patchouli or valerian-family roots in some regional formulas. These ingredients are used in gram quantities relative to the woods and resins, functioning as accents rather than structural material, and their proportions are usually the most closely guarded part of a maker’s formula.

What does Japanese incense smell like compared with Chinese or Arabian incense?

Japanese stick incense tends to read drier and more restrained than Arabian bakhoor, which layers agarwood chips directly with resins and sometimes musk or oud oil for a denser, sweeter smoke described in our guide to bakhoor. It is also generally less resin-forward than church incense built around frankincense and myrrh. The Japanese preference runs toward agarwood and sandalwood as the dominant register, with clove and benzoin used sparingly to round rather than sweeten the blend — an aesthetic that favors clarity of the wood note over an enveloping sweetness.

How nerikō brings the ingredients together

Nerikō, kneaded incense, is where benzoin’s binding role is most visible. Powdered agarwood, sandalwood, clove and other spices are mixed with charcoal ash, honey and dried, pitted ume (plum) pulp, then rolled into small pellets and aged for weeks or months in sealed ceramic jars before use, a maturation step that mellows sharp top notes and lets the fixative resins integrate. Because nerikō is warmed on a small mica or metal plate over charcoal rather than burned directly, the blend releases its aroma without the smoke and ash of a stick, a distinction covered in detail in our piece on nerikō and benzoin’s role in it.

Core ingredients at a glance

Where these materials come from today

Every major ingredient in Japanese incense is imported, and supply pressure has grown on the two most valuable ones. Wild Aquilaria populations have been reduced by centuries of harvesting, pushing much of today’s agarwood trade toward plantation-grown, artificially inoculated trees rather than wild-collected wood, and toward CITES permitting for cross-border shipments. Indian sandalwood export controls have similarly reshaped sourcing toward Indonesian and Australian material. Benzoin has fared better: tapping Styrax trees for resin does not require felling them, and cooperative farming structures in Laos have kept small-scale, renewable supply flowing to incense and perfumery markets even as agarwood and sandalwood face tightening restrictions.

• japanese incense
• agarwood
• sandalwood
• benzoin
• nerikō