Castor Oil Refill
4 fl oz118 mL · Fills the 2 oz roll-on twice.
View detailsIntroducing Greymill
Thoughtfully sourced castor oil in beautifully simple formats — made for the small rituals that fill your day.
Our belief
We believe the most meaningful routines are often the simplest. That’s why we focus on thoughtful ingredients, practical formats, and everyday care that feels effortless.
Read our storyConcept render — final packaging in development.
The first Greymill essential
A thoughtfully designed glass roll-on that makes incorporating castor oil into your routine beautifully simple.
Discover a simpler way to make botanical care part of your day.
Why Greymill
Focused formulas built around ingredients with a clear purpose.
Easy-to-use formats designed for real everyday routines.
Carefully selected producers and an emphasis on consistency.
Less unnecessary complexity. More attention to what matters.
The Ritual
Refills
Your daily essentials should be easy to return to. Two refill sizes, made for ongoing care.
2 fl oz roll-on4 or 8 fl oz refill
From the ingredients we choose to the way our products fit into your day, Greymill is built around a simple idea: self-care should feel good to use.
The Greymill Journal
Ingredient notesComing soon
Where castor oil comes from, how it's pressed, and how it fits a cosmetic routine.
Everyday ritualsComing soon
Fewer steps, chosen with care — and why consistency matters more than complexity.
Behind GreymillComing soon
Why we designed the roll-on to be topped up rather than replaced.