Marula oil didn't irritate skin and significantly improved hydration and moisture in a 20-person clinical study. The oil is mostly oleic acid (69%), a fatty acid that helps skin retain water. Results showed it works as both a moisturizer and a protective barrier on dry skin.

Researchers tested marula oil on 20 healthy adult women using standardized instruments to measure irritation, hydration, moisture, and water loss from skin over time.

Funding not disclosed in abstract