Siam Benzoin is the fine, pale grade of benzoin resin harvested from Styrax tonkinensis in Laos and northern Vietnam. Softer and more vanillic than Sumatra benzoin, it gives perfumes a creamy, almond-milk sweetness and is regarded as the premium benzoin for fine fragrance.

What does Siam Benzoin smell like?

Siam benzoin is gentle and rounded: vanilla and warm caramel, with an almond or marzipan softness, a clean balsamic glow and a faint church-candle quality. Where Sumatra benzoin carries cinnamic spice and a darker, more smoky edge, the Siam type is mellow and milky, and it is also gentler and less spicy than balsams such as Peru balsam or styrax. Its absolute and resinoid forms differ mainly in intensity and texture, with the absolute more concentrated and slightly more refined. It should not be confused with Siam wood (Fokienia hodginsii), a smoky conifer wood.

Where Siam Benzoin comes from

Styrax tonkinensis is a fast-growing tree often cultivated by smallholders in upland Laos, particularly around Luang Prabang, as part of rotational farming. Farmers cut the bark and collect the resin as it hardens into pale tears with a milky fracture. The tears are graded by size and colour before being extracted into resinoids or absolutes.

• Also known as: Siam, Benzoin Siam, Laos benzoin, Styrax tonkinensis resin
• Fragrance family: Amber (balsamic)
• Type: Natural
• Main origins: Northern Laos; also Vietnam and Cambodia
• How it's obtained: Tapping of the bark; resin tears extracted with solvents to a resinoid or absolute
• Key aroma molecules: Coniferyl benzoate (the major component), p-coumaryl benzoate, benzoic acid, vanillin

Siam Benzoin in perfume history

The name recalls Siam, the name of Thailand until 1939, through which much of the resin was historically traded even though the trees grew mainly in present-day Laos. Tonkin (northern Vietnam) gave the tree its botanical name. Benzoin was burned in South-East Asian religious ceremonies long before it reached European perfumery, where the finest Siam tears were long considered the benchmark grade for pharmacy and perfumery.

Siam Benzoin in modern perfumery

Production is small compared with Sumatra benzoin, making Siam benzoin the more expensive, sought-after grade. It features in fine vanilla and amber compositions, and several suppliers and fragrance houses run sourcing programmes with Lao farming communities to secure quality and traceability. Some brands list it simply as Siam, a modern shorthand found mostly in niche perfumery and brands with Thai links, such as Bangkok-based Parfums Dusita, whose Cavatina includes it among its notes.

How Siam Benzoin wears and what it pairs with

A soft base note with good longevity, it adds creamy depth and gently fixes a composition. Classic partners include vanilla, tonka, heliotrope, iris, musk, sandalwood and rose, as well as jasmine, frangipani and tuberose.

Safety and regulation

Siam benzoin naturally contains vanillin and benzyl benzoate, both listed EU fragrance allergens that must be declared above set thresholds in cosmetic products.