Church incense is made primarily from frankincense, a natural resin harvested from Boswellia trees. This single ingredient forms the base of nearly all liturgical incense, but most blends add secondary resins, wood powders, and aromatic oils to create the rich, layered scent you recognize from a worship service.
Frankincense: The Core Ingredient
Frankincense, also called olibanum, is the dried sap of Boswellia trees. Harvesters make small cuts in the bark, and the tree bleeds a milky resin that hardens into pale, amber-colored lumps called “tears.” These tears are what get placed on hot charcoal inside a censer (the swinging metal container you see in church).
Several Boswellia species supply the global incense market. Boswellia sacra grows in the rugged mountains of southern Oman’s Dhofar region and produces one of the most prized varieties. Boswellia papyrifera thrives in the highlands of Ethiopia, particularly in the Tigray, Benishangul, and Amhara regions. Other species grow across Somalia, Eritrea, Yemen, Sudan, and India. These regions sit along the ancient frankincense trade routes that supplied temples and churches for thousands of years.
When burned, frankincense produces a warm, slightly sweet, balsamic smoke. On its own, it has a clean resinous quality. Most church incense blends start here and build outward.
Secondary Resins and Aromatics
Pure frankincense is common in simpler liturgical settings, but most church incense is a blend. The additional ingredients vary by tradition and manufacturer, but a few appear regularly:
- Myrrh: Another tree resin, darker and more bitter than frankincense. It adds depth and a slightly medicinal, earthy tone.
- Benzoin: A resin with a warm, vanilla-like sweetness. It’s especially common in pontifical incense, the blend used at major Catholic celebrations.
- Styrax (storax): A balsamic resin that contributes a rich, honey-like note.
- Copal: A lighter resin, often sourced from India, that burns cleanly and adds a bright, citrusy quality.
- Dammar: A pale, hard resin that helps other ingredients burn more evenly.
- Sandalwood: A powdered wood that gives incense a creamy, woody base note.
Some blends also incorporate flower and spice extracts like lavender, jasmine, rose, rosemary, violet, and vanilla. These are typically added as essential oils or absolutes, infused into the resin base before burning.
The Biblical Recipe
The tradition of burning incense in worship stretches back to the Old Testament. Exodus 30:34 gives a specific recipe, instructing Moses to combine four ingredients in equal parts: gum resin (likely a form of frankincense or similar tree sap), onycha (possibly derived from a mollusk shell or a plant resin), galbanum (a sharp, green-smelling resin from a plant in the carrot family), and pure frankincense.
Modern church incense doesn’t follow this recipe literally. Onycha in particular remains a mystery, with scholars still debating what it actually was. But the passage established the theological importance of incense in Judeo-Christian worship, and frankincense has remained the central ingredient for over two millennia.
How Catholic and Orthodox Incense Differ
Catholic and Eastern Orthodox churches both burn incense, but their blends have distinctly different characters. Catholic incense tends toward a balanced, moderate fragrance. The Church favors natural resins, particularly frankincense and benzoin, producing balsamic notes with a subtle vanilla undertone. The goal is a scent that supports prayer without overwhelming the space.
Orthodox incense is noticeably more intense. Blends are typically enriched with essential oils, often featuring pronounced floral notes like rose, jasmine, and lavender. The fragrance is meant to be enveloping. This makes sense given how extensively Orthodox services use incense: it appears at every stage of the liturgy, censing the icons, the sanctuary, and the congregation throughout the service. Catholic use, while significant, tends to be more selective, reserved for particular moments within the Mass.
If you’ve attended both types of services, you likely noticed this difference immediately. Orthodox incense tends to linger on clothing and hair for hours, while Catholic blends are generally lighter.
How It Burns
Liturgical incense typically comes in one of two forms: loose resin granules or pre-blended chunks. Unlike the stick or cone incense you might use at home, church incense doesn’t burn on its own. It needs an external heat source.
A server places a lit charcoal disc inside the censer, waits for it to glow, then spoons incense granules on top. The charcoal heats the resin to the point where it melts and releases fragrant smoke without fully combusting. This is why church incense produces thick, white, billowing clouds rather than the thin wisp of a burning stick. The smoke carries vaporized resin compounds into the air, creating the distinctive scent that fills the building.
Health Effects of Incense Smoke
The same aromatic compounds that make church incense smell distinctive also produce fine particulate matter when burned. This smoke contains volatile organic compounds that can irritate the eyes, nose, and throat. For most people attending a weekly service, exposure is brief and unlikely to cause problems. But the effects are measurable in people with prolonged or frequent exposure.
Research on temple workers who spend hours around burning incense daily found they were roughly 4.5 times more likely to report throat irritation and about 4 times more likely to experience nose irritation compared to workers in buildings without incense. Chronic cough was also significantly more common in this group. The smoke can trigger asthma flare-ups and has been linked to allergic skin reactions, particularly from synthetic perfume additives in lower-quality blends.
If you’re sensitive to incense smoke, sitting farther from the altar and closer to doors or windows helps reduce your exposure. The particulate concentration drops significantly with distance and ventilation. Churches with high ceilings and good airflow tend to disperse the smoke more effectively than small, enclosed chapels.