Macadamia Acid

Macadamia acid is a fatty acid derived from macadamia nut oil. In skincare formulations, it functions primarily as an emollient—a substance that softens and smooths the skin surface—and as an emulsion stabiliser, helping to keep oil and water-based ingredients mixed together evenly.The ingredient comes from macadamia integrifolia, a tree native to Australia. Extraction methods vary, though research suggests green extraction techniques using water can preserve beneficial compounds from the plant material, including polyphenols with antioxidant properties.

Macadamia acid works by binding to the skin's outer layers, creating an occlusive barrier that reduces transepidermal water loss. This helps skin retain moisture and feel smoother. The ingredient also contains polyphenols—natural compounds that may offer antioxidant benefits by neutralising free radicals, though the extent of this effect in topical skincare requires further investigation.In formulations, it acts as an emulsion stabiliser by helping oil and water components remain blended, which maintains product consistency and allows other actives to work effectively.

Macadamia acid is typically used as a supporting ingredient within moisturisers, serums and emulsified formulations rather than as a standalone treatment. It works alongside other hydrating and conditioning actives. For best results, apply to damp skin to enhance moisture penetration, and use consistently as part of your daily routine. The ingredient requires no special preparation or timing considerations.

Macadamia acid is generally well-tolerated and suitable for most skin types, including sensitive skin. Patch testing is advisable if you have known sensitivities to macadamia nut products.