What it is
This is a fatty oil obtained from the kernels of the macadamia nut, notable for a high content of monounsaturated fatty acids including oleic and palmitoleic acid. In formulas it acts as an emollient, leaving a soft, smooth feel and helping reduce the sensation of dryness. In sunscreens it is part of the oil phase that improves spreadability and skin feel rather than contributing to UV protection.
Safety & warnings
Macadamia seed oil is generally well tolerated and widely used in leave-on products. As a rich, fatty plant oil it is reported to have moderate comedogenic potential, so people highly prone to clogged pores or acne may want to monitor how their skin responds.
Origin & sourcing
Natural; a fixed (non-volatile) oil cold-pressed or expeller-pressed from the seeds (nuts) of the macadamia tree.
Questions everyone asks
What does macadamia oil do in a sunscreen?
It works as an emollient, softening the skin and improving how smoothly the product spreads and feels. It is not a UV filter.
Is macadamia oil likely to clog pores?
It is a rich plant oil with moderate comedogenic potential. Most people tolerate it well, but those very prone to breakouts may want to watch their skin's reaction.