Santalum Spicatum (Sandalwood) Oil, derived from the heartwood of the Australian sandalwood tree, is a sesquiterpene-rich essential oil primarily composed of α-santalol and β-santalol, compounds known for their anti-inflammatory, soothing, and skin-conditioning properties. In skincare formulations, this oil is valued not only for its distinctive aromatic profile but also for its biological activity on irritated and stressed skin. Research indicates that sandalwood oil can help modulate inflammatory mediators and support epidermal comfort, making it relevant for formulations targeting redness, sensitivity, and barrier disruption. Its lipophilic nature allows it to integrate efficiently into emollient systems, contributing to improved skin feel and enhanced delivery of complementary actives.

In haircare and scalp applications, Santalum spicatum oil is used more selectively, typically in scalp serums, leave-in treatments, and calming hair products. Its role is primarily supportive, helping to maintain scalp comfort and reduce sensations associated with dryness or imbalance. While it does not directly stimulate hair growth, its ability to support a balanced scalp environment may indirectly benefit hair quality over time. Compared to East Indian sandalwood (Santalum album), Australian sandalwood oil is often favored in modern cosmetic formulations due to its more sustainable sourcing profile and consistent chemical composition, which improves formulation predictability and regulatory acceptance.