Short answer: “sandalwood oil” can come from several species. Indian sandalwood is Santalum album, while Australian sandalwood is usually Santalum spicatum; amyris is not a true sandalwood. Most medical claims rest on laboratory, animal or preliminary product research rather than robust clinical trials.
The species matters
Kew records Santalum album, a slow-growing, root-hemiparasitic tree valued for its aromatic heartwood. Other Santalum species produce oils with different compositions. “West Indian sandalwood” often refers to Amyris balsamifera, which is botanically unrelated and should be labelled as amyris.
True sandalwood oil is distilled from heartwood and roots rather than leaves. Species, age, growing conditions, heartwood content and distillation influence yield and composition. High value and limited supply make transparent sourcing especially important.
Chemistry and authenticity
Alpha-santalol and beta-santalol are major fragrance compounds in Santalum album oil. Other sandalwood species can have different santalol proportions. A scientific review discusses the experimental medicinal research on alpha-santalol, much of which involves cells or animals rather than patients.
Synthetic sandalwood aroma chemicals are legitimate perfume ingredients when declared accurately, but they are not the same as the natural oil. A batch chromatogram, species declaration and traceable origin are more meaningful than “therapeutic grade”.
Human research is preliminary
A small human experiment measured physiological and self-rated responses to East Indian sandalwood odour and alpha-santalol. Such short exposures can explore alertness or arousal, but they do not establish treatment for anxiety, depression or insomnia.
Topical sandalwood formulations have also been explored for skin conditions, including acne. These are product-specific investigations, often involving multiple ingredients or uncontrolled designs. They should not be translated into a claim that neat sandalwood oil treats acne, eczema, psoriasis or infection.
Antimicrobial, anti-inflammatory and anticancer findings in experimental systems are hypotheses for further study. They do not justify swallowing the oil, applying it to lesions or using it instead of oncology or dermatology care.
Sourcing and conservation
Sandalwood’s value and long maturation create risks of illegal harvest, species substitution and poorly documented supply chains. Conservation status and trade rules can change, so buyers should look for current, species-specific sourcing information rather than relying on a general “sustainable” badge.
A credible supplier should be able to name the plantation or region, describe traceability and explain whether the oil is Indian, Australian, New Caledonian or another sandalwood. Low price is a reason to scrutinise identity, not proof of adulteration by itself.
How to assess the evidence
Studies of alpha-santalol are constituent research, not necessarily tests of a complete commercial oil. Animal tumour models and cell experiments can identify biological pathways but cannot show that topical or inhaled sandalwood prevents cancer in people. A short physiological response to an odour is likewise not treatment of a psychiatric condition.
For a skin claim, check whether the trial used one ingredient or a multi-product regimen, whether it had a control group and whether assessors were blinded. Also check the species: evidence about Australian sandalwood should not be silently transferred to Indian sandalwood, or the reverse.
Safety
Natural origin does not prevent irritation or allergy. Essential oils are recognised causes of allergic contact dermatitis. Safety findings for one formulated cosmetic cannot be applied to undiluted oil.
- Do not swallow sandalwood essential oil.
- Do not apply it neat, to broken skin or near the eyes.
- Prefer a finished, safety-assessed cosmetic for topical use.
- Diffuse sparingly and ventilate the room.
- Keep concentrated products away from children and pets.
Buying checklist
- The full species and heartwood or root plant part are stated.
- Natural oil, amyris and synthetic fragrance are clearly distinguished.
- Origin and traceability information are current and specific.
- A batch chromatogram and lot number are available.
- Preclinical findings are not advertised as proof of treating disease.
My assessment
Sandalwood is an important fragrance material with complex sourcing and authenticity questions. Human evidence for health effects is preliminary and product-specific. The most useful profile begins with exact species and traceability, then keeps laboratory mechanisms separate from clinical effectiveness.