How to Dilute Essential Oils the Right Way
Essential oils are not decoration. They are active ingredients, and the difference between a blend that soothes and one that burns often comes down to how much you use.
That might sound intimidating, but it really is not. Once you understand the basic ratios, diluting essential oils correctly becomes second nature. And those ratios are not arbitrary rules someone made up. They exist because your skin actually absorbs what you put on it. More is not better when it comes to concentrated plant extracts. More is just more, and that is not always a good thing.
Here is where to start.
Start with Your Face
If you are making a facial recipe, the percentages come first, and they come in small. Stay between 0.5% and 1% and treat that range with respect. It may sound like almost nothing, but on your face, it is plenty.
Here is what that looks like in real life. At 0.5%, you are working with about 1 drop per tablespoon of total recipe volume. At 1%, you are at about 3 drops per tablespoon. That is not a lot, and that is the point. The face is delicate, and it absorbs everything you put on it. Start at the lower end, pay attention to how your skin responds, and only work your way up if you feel like you need to. Your skin will let you know pretty quickly if you have overdone it, and trust me, that is not a conversation you want to have with your face. The complete face dilution chart is in Section 3.2 of Castor Oil for Life.
Moving to the Body
For body recipes, you have a little more room, but you still start low. Begin at 1%, which works out to roughly 3 drops per tablespoon of total recipe volume. For most body blends, 1% to 2% is the sweet spot, and 2% lands around 5 drops per tablespoon. You may see other sources say more, and technically, that math works too. The difference comes down to drop size, which is not perfectly standardized. A small drop and a generous drop are not the same thing, and that matters when you are working in small volumes. At larger volumes, it all evens out, which is why the recipes in Castor Oil for Life are measured by the cup rather than the tablespoon. For those, start around 40 drops per cup of total recipe volume, which is right at 1%, and do not exceed 96 drops per cup, which is the outer limit of 2%. More is not better. It is just stronger. The complete body dilution chart is in Section 2.13 of Castor Oil for Life.
The Math Is Easier Than You Think
To figure out the total volume of your recipe, just add everything together. If you are using a quarter cup of castor oil, a quarter cup of shea butter, and a half cup of green tea, that gives you 1 cup total. From there, your dilution math is simple, and the numbers we just talked about do the rest of the work for you.
A Few Things Worth Knowing
Add your essential oils last or before your mixture cools completely. This helps the scent and the therapeutic properties blend in evenly rather than just sitting on top. And please, take notes. It does not have to be fancy. Even a quick scratch on a sticky note telling you what you used and how much can save you a lot of guesswork later when something works beautifully, and you want to make it again.
As for which oils to reach for, lavender and chamomile are calming and gentle. Citrus oils feel fresh and uplifting. Every essential oil brings its own personality to a blend, and part of the real pleasure of making your own recipes is discovering which ones feel right for you.
About That Temptation to Add More
First, please do experiment. Try different carrier oils, mix in a little yogurt, mash up some avocado or banana. That kind of creativity is exactly what making your own recipes is all about, and the dilution math stays the same no matter what you add. Just keep your total volume in mind, and your drop count will always be right.
Here is the one place where going rogue will get you into trouble, though. Essential oils are not perfume. When you spray on a store-bought fragrance and cannot smell it strongly enough, you just spray more. That logic does not work here. Some essential oils have a naturally light scent, and that lightness can be tempting. It feels like it is not doing anything. It is. Your skin is absorbing every drop you put on it, and adding more does not make the blend work better. It just makes it stronger than your skin bargained for. Too much can mean irritation, redness, or burning, and once your skin has a bad reaction, it can become more sensitive to that oil going forward. That is called sensitization, and it is worth avoiding.
Start with the recipe as written at first. Your skin will thank you.
Come Back Often, There Is More Coming
Every recipe in Castor Oil for Life is written out completely, drops and all, so you never have to calculate a thing. The dilution is already done for you. You just measure, mix, and go.
Sign up for the newsletter so you do not miss a thing. Be the first to know when the book drops. New blogs are added here regularly, and honestly, we are just getting started. There is so much good stuff ahead, and I am really glad you are here for it.
With warmth and wellness,
Nora Hale
A note from Nora: Castor Oil for Life is anticipated to launch in mid to late June 2026, and things are coming together beautifully. The blogs are beginning to take shape, each one drawing from the book to give you a glimpse of what's inside. They're meant to spark ideas and curiosity, though you may find there's still plenty to explore in each one. The full depth and detail, however, live within the pages of the book itself.
Edited 5-1-2026: The newsletter signup on the Connect page is up and running, and that's where the real conversation begins. Fresh recipes, ones not found in the book, along with the latest research and everything new, will land right in your inbox. It wouldn't feel right to simply repeat the recipes already in the book for those who've invested in it, so the newsletter will always bring you something new.
Because this is more than a book. It's an ongoing journey, and I'd love for you to be part of it.