Guaiac wood is one of the few perfume woods you cannot legally ship without a government permit.
It is distilled from Bulnesia sarmientoi, a slow-growing tree of the Gran Chaco, the dry forest that runs across Paraguay and northern Argentina. Wood and sawdust are steam-distilled into a thick, semi-solid oil that melts with a little warmth. The tree grows slowly and only in that one belt of South America, so there is no quick way to make more of it.
In South America the tree is often called palo santo. That causes confusion, because the palo santo sold as incense sticks is a different tree, Bursera graveolens. Same nickname, different wood, different smell.
On skin it opens smoky and dry, then softens into something sweet and rosy, almost like warm black tea. It is creamy rather than sharp. That mix of smoke and rose is why perfumers reach for it: it can carry fire and still sit next to flowers. It has long served as a fixative in soaps and woody blends, and it pairs naturally with rose and oud.
Here is the part the marketing leaves out. Since March 2010, Bulnesia sarmientoi has been listed on CITES Appendix II, the treaty that controls trade in at-risk species. Every shipment of the wood or its oil needs an export permit. Supply is capped, so real guaiac wood oil is not cheap, and plenty of budget scents fake the effect with woody-amber synthetics instead.
Guaiac wood is a base note. It is heavy and slow to fade, so it anchors a fragrance and helps the lighter notes above it last.
Want that smoky, rose-tea wood without the paperwork? Our Altair (our take on Althair by Parfums de Marly) and Invicto (our take on Invictus by Paco Rabanne) both use guaiac wood in the blend, UK-made sprays at 35% concentration.