One of the best kept secrets in skincare is how little of what you apply actually makes it through your skin. Your skin has a threshold, a size limit for molecules, and most of what you put on stays right on the surface.
And that includes most oils. Argan, rosehip, coconut. They soften your skin and lock in moisture, but they don't go much further.
Castor oil is different. Not just in how much gets absorbed, but in how it behaves once it hits your skin.
Here's why.
Fatty acids are the building blocks of oils, the individual molecules that make up what you put on your skin, and most are straight chains. When those straight chains meet your skin, they line up, stack on top of each other, and stay flat on the surface.¹
Nearly 90% of castor oil is one fatty acid called ricinoleic acid,¹ and ricinoleic acid has a secret. A kink in its chain.
That kink means it can't line up and stack like the others, so instead of stopping at the surface it moves more fluidly within the skin barrier, into the layers where circulation and fluid buildup begin to shape what you see on the surface.²
Once ricinoleic acid gets past that threshold, it works with a receptor in your body called EP3, one of your body's own regulators of blood flow and fluid movement.³ Your body does the rest.
And circulation is where all castor oil rituals begin.