Sandalwood Oil: Benefits, Uses and Precautions

Sandalwood essential oil is obtained by distilling the wood of Santalum album, the tree already introduced in our article sandalwood, which focuses on the traditional use of the powder made into a paste for the skin. The oil, by contrast, is mainly intended for room diffusion and heavily diluted massage, valued for a woody scent linked for millennia to meditation and mental calm.

But the image of a purely "relaxing" oil deserves some nuance: a study published in 2006 measured rather stimulating effects on certain physiological markers. Here is what the research actually shows, how to use this oil in practice, and how to choose it without contributing to the overexploitation of the tree.

Traditional uses of sandalwood oil

• Room diffusion: a few drops in a diffuser, to set a mood suited to meditation or evening reading — the most common and safest use;
• Heavily diluted massage: applied to the temples or nape, always diluted in a carrier oil, for a soothing sensory effect;
• Personal fragrance: a few diluted drops on the wrists, in the tradition of Indian natural perfumes.

Unlike sandalwood powder, the essential oil is never applied undiluted to the skin or taken orally without professional supervision: its concentration of active compounds is far higher than that of the powdered wood.

What does the research actually show about this oil?

A study by Heuberger, Hongratanaworakit and Buchbauer, published in 2006 in the journal Planta Medica (vol. 72, pp. 792-800), measured in healthy volunteers the effects of inhaling East Indian sandalwood oil and its major component, alpha-santalol, on objective physiological markers — pulse, skin conductance, blood pressure — as well as subjective self-rated alertness. The result is unexpected: compared with an odorless placebo, inhaling sandalwood raised pulse, skin conductance and systolic blood pressure — markers more associated with physiological activation than relaxation. This is an honest finding worth knowing: it nuances the scent's traditional "calming" reputation without necessarily invalidating the subjective sense of well-being many people associate with it — the two are not necessarily contradictory, since a scent can produce a perceived sense of calm while slightly activating the body.

This nuance illustrates a useful principle for reading any essential-oil study: a reported subjective effect ("I feel calm") and a measured physiological effect (pulse, blood pressure) do not always tell the same story.

How to use sandalwood oil in practice

Use	Dilution	Note
Room diffusion	3 to 5 drops in a diffuser	Ventilated room, 15 to 20 minutes maximum
Temple or nape massage	1 drop diluted in 1 teaspoon of carrier oil	Never undiluted on the skin
Fragrance on the wrists	1 drop diluted in a neutral carrier oil	Patch test on the inner elbow beforehand

How to choose a responsibly sourced sandalwood oil?

Indian white sandalwood (Santalum album) is a rare essence, classified as vulnerable after decades of overexploitation, and its trade is strictly regulated in India — an issue already detailed in our article sandalwood. An authentic essential oil is therefore expensive: an unusually low price almost always signals an oil that is cut, diluted in a solvent, or sourced from another wood. Two more sustainably cultivated alternatives exist: Australian sandalwood (Santalum spicatum) and, to a lesser extent, New Caledonian sandalwood. Our guide how to choose sandalwood details traceability criteria that apply to any format, powder or oil.

Sandalwood or vetiver: which oil to choose?

For a need centered on physical cooling rather than mental calm — difficult summer nights, a diffuse sensation of heat — vetiver is often preferred. Our comparison sandalwood vs vetiver details both profiles, complementary rather than competing in a summer evening routine.

Precautions

• Never undiluted on the skin: always dilute in a carrier oil, whatever the intended use;
• Oral use excluded: no sandalwood essential oil should be taken internally without supervision from a trained professional;
• Pregnancy, breastfeeding and young children: discouraged as a precaution, like most concentrated essential oils;
• Skin allergies: patch test on the inner elbow before any diluted application;
• Diffusion: short sessions in a ventilated room, to avoid around people sensitive to asthma.

General precautions for essential oils and sensitive populations are in our safety and precautions guide.

How long it takes and how long to use it

The scent effect of sandalwood oil is immediate, within the first few minutes of diffusion. The practical recommendation is to keep each session to 15 to 20 minutes, in a ventilated room, rather than aiming for continuous diffusion in the hope of strengthening a relaxing effect.

Recommended diffusion time

Use	Duration	Note
Room diffusion	15 to 20 minutes	Ventilated room, not repeated continuously all day
Massage on temples or neck	One-off application, not repeated during the day	Always diluted
Scent on the wrists	Noticeable for several hours	Diluted in a neutral carrier oil

Why a short exposure rather than a continuous one?

The Heuberger, Hongratanaworakit and Buchbauer study, published in 2006 in Planta Medica, measured detectable physiological effects (pulse, skin conductance, blood pressure) after a single exposure to inhaled sandalwood in healthy volunteers. This short exposure protocol is therefore enough to produce a measurable physiological effect: nothing indicates that a longer or continuous diffusion would add any benefit, while it does increase unnecessary exposure to aromatic compounds, particularly for sensitive people.

Immediate effect on atmosphere, uncertain effect on relaxation

As detailed in the feedback gathered in our sandalwood oil reviews article, the olfactory pleasure and the atmosphere sandalwood creates are felt within the first few minutes. A measurable and lasting relaxing effect, on the other hand, remains uncertain: the reference study actually observed a slight physiological activation rather than an objective calming effect, whatever the tested exposure length.

Precautions

These benchmarks concern diffusion and diluted massage. Full precautions, notably for pregnancy, breastfeeding and people with sensitive airways, are detailed in our sandalwood oil dangers article. For general precautions, see our safety and precautions guide.