palo santo

What is palo santo?

Palo santo is the fragrant wood of Bursera graveolens, a small tree of the dry forests of Latin America. The name is Spanish for "holy wood". Sticks of the dead, fallen wood are burned as incense.

The smoke smells sweet and resin-like. People burn it to scent a room, to open a ritual, or to settle the mood before rest or prayer. An essential oil is also steam-distilled from the wood.

Here is the honest verdict. There are almost no human studies on palo santo for any health claim. Long traditional use tells you people valued it; it does not prove that it works, and it does not prove that it is safe.

Watch the name on the label. A different tree, Bulnesia sarmientoi, is also sold as palo santo. Look for the words Bursera graveolens if you want this wood.

How does palo santo work?

No one has shown how palo santo acts in the human body. What follows is laboratory work, not proof of a health effect.

Lab analysis shows the wood oil is rich in limonene, a citrus-smelling plant compound. In test tubes, limonene-rich oils slow the growth of some bacteria and fungi. Whether burning the wood in a room does anything similar is not established.

Cell and animal studies on limonene suggest it may lower some markers of inflammation. Those tests used doses and settings far removed from smelling incense.

A simpler explanation covers much of what people report. Smell is tied closely to memory and mood. A familiar ritual scent can help you feel calmer, and that is real, but it is not special to this wood.

One part is well documented, and it is not a benefit. Burning wood makes smoke, and smoke carries fine particles and carbon monoxide. Indoor incense smoke is known to irritate the eyes and airways.

What forms does palo santo come in?

Palo santo reaches buyers in a few forms.

- Sticks or chips of wood, lit and then blown out so they smoulder.

- Resin or wood powder, burned on a charcoal disc.

- Steam-distilled essential oil, used in diffusers or diluted for skin.

- Cones and blended incense sticks, which hold other gums and binders.

- Hydrosol, the scented water left over from distilling.

Most traditional use is the burned wood. The oil and the cosmetic products are newer and aimed at export markets.

Source matters here. Careful suppliers use wood from trees that died naturally and lay on the ground for years. Cutting live trees is restricted in parts of Peru and Ecuador.

Blended products often hide what else is in them. Check the label for the botanical name and for added fragrance.

Where it comes from:

Palo santo has been burned in the dry coastal forests of Ecuador and Peru for centuries. Spanish writers recorded the name "holy wood" soon after contact. Healers used the smoke in cleansing rites called limpias.

The smoke also had plain household uses. Rural families burned it to drive off mosquitoes and other insects. That use continues today.

In Andean and Amazonian ceremony, the wood opened a session or marked a space as set apart. Folk healers paired it with prayer, tobacco and other plants. The role was as much ritual as medical.

Wellness shops outside the region took it up from the 2000s on. Demand rose, and so did worry about cutting living trees. Several countries now limit harvest and export.

What does palo santo help with?

• Scenting a room as incense: This is the one thing palo santo plainly does. The smouldering wood gives a strong sweet scent within seconds. That is a fragrance effect, not a health effect.
• Ritual and ceremonial cleansing: Healers in Ecuador and Peru burned the wood to mark a space as set apart. This is a cultural practice with deep roots. It is not something science can test as a medical treatment, and it has not been.
• Relaxation and winding down: Many users say the smell helps them settle. A familiar scent used at a set time can work as a cue to relax. No trial has tested palo santo smoke for stress or anxiety in people. Any calming you feel may owe as much to the pause as to the wood.
• Sleep support (traditional claim, untested): Some people burn it before bed as part of a wind-down routine. There is no human study on palo santo and sleep. Smoke in a bedroom also irritates airways in some people, which can work against sleep.
• Repelling mosquitoes and other insects: This is the oldest practical use of the wood, and it is widespread in rural Ecuador and Peru. Lab work shows limonene-rich oils repel some insects. Field evidence for palo santo smoke itself is thin. Any smoke moves insects along to some degree, so the wood may not be doing anything special.
• Diluted oil rubbed on sore muscles (traditional claim): Folk use includes rubbing the diluted oil on aching joints and muscles. In cell and animal work, limonene lowers some inflammation markers. That has not been shown to help pain in people. The oil can also cause an allergic rash, especially once it has aged.

What are the side effects of palo santo?

• Coughing and throat irritation from the smoke
• Stinging or watering eyes
• Headache from a strong scent
• Wheeze or chest tightness in people with asthma
• Worse symptoms in anyone with a long-term lung problem
• Nausea in people sensitive to smoke
• Skin rash or itching from the oil, especially older oil
• Burns, scorch marks and fire risk from the lit wood

Good to know:

Mild irritation is the common problem, and it usually settles once the room is aired.

The risks that matter are breathing-related. Smoke can set off an asthma attack, and that can be serious. Fine particles from any indoor burning are a known irritant.

Skin reactions to the oil are less common but can be stubborn. Once you react to oxidised limonene, the rash tends to come back each time you use it.

How much palo santo should you take?

• Recommended daily: Palo santo is not a supplement, so there is no daily amount backed by evidence. Stick labels usually describe lighting one stick, letting it flame for a few seconds, then blowing it out to smoulder. Essential oil labels usually give a dilution of about 1 to 2 percent in a carrier oil for skin. Diffuser labels tend to suggest a few drops in water. These are label conventions, not advice for you. The oil is not for swallowing. Keep any burning wood in a well-aired room.
• Best time of day: Time of day makes no difference to any physical effect, because none is established. People tend to burn it in the evening or at the start of a ritual. If you burn it indoors, pick a time when you can open a window.
• With or without food: Food is not relevant. Palo santo is burned or applied to skin, not eaten. Never swallow the essential oil, with food or without it.
• Time to effect: The smell arrives within seconds. Any sense of calm that follows tends to come quickly too, and it fades with the scent. For any health claim, the honest answer is different. There is no proven effect to wait for, and it may do nothing at all.
• How long to take it: Keep it short. Most ritual use lasts a few minutes, not hours. Smoke builds up in a closed room. The longer the wood burns, the more particles you breathe. No study tells you a safe number of sessions per week. Daily indoor burning is a much larger exposure than the odd session. Treat it with the care you would give any indoor smoke.