How to Make Castile Soap for Sensitive Skin

This Castile soap recipe was the first kind of soap that I ever made. 

Castile Soap is wonderfully gentle.  For many many years people have used it on their baby’s skin, as well as any sensitive skin or skin with acne.  My mother-in-law was having a problem with her skin.  Other soaps had started really irritating it, but when she started using my newly cured castile soap, her skin condition cleared right up!

Why I Chose Castile Soap

I chose a castile soap for my first recipe, because it’s mostly made of olive oil and that happened to be one ingredient that I had on hand. After all, I didn’t want to buy a lot of products for something that I wasn’t sure I would like to do or not (Boy was I wrong in the long run! But it was smart to start slow).

Another reasons that I wanted to start with a castile soap is that I did not have any lard or tallow at the time and did not know where I could find some.  I really wanted to make traditional lard and tallow soaps, but didn’t know where to start. Now I know I could have gotten some animal fat to render from from the grocery store butcher, but I wanted to use wholesome products without any additives, antibiotic or hormone usage.  Now I know a few farmers who provide for me, but those connections take time and effort to build and you have to start somewhere.

Castile Soap Ingredients

Olive oil is something you can usually find at your local grocery store. Grocery store olive oil has become controversial, because some olive oil has been found to be soy or other types of vegetable oil instead being sold as olive oil. So, know your brand before you buy.

This recipe calls for a little bit of coconut oil.  The reason for that is that a Castile bar is very soft.  The little bit of coconut helps it to be more stable, as well as gives the bar a some added lather and cleansing properties.  Coconut is great for bubbles.  Technically, the percentage of olive oil determines whether a soap is castile or bastille, but for simplicity’s sake most people refer to high olive oil content soap as castile.

The recipe calls for essential oils of your choice. If you’re looking for gentle essential oils, try lavender, ylang ylang, geranium, or chamomile. Or try a combination of a few of those with a total of one ounce for the recipe below.

Castile Soap Recipe – 86% olive oil

This recipe makes 3 pounds of soap or twelve 4oz bars.

Ingredients:

• 30 ounces olive oil
• 5 ounces coconut oil
• 11.2 ounces cold water
• 4.5 ounces lye
• 1 ounce essential oil of choice

For Detailed Soap Making Instructions see 7 Easy Steps for Homemade Soap for Beginners

Directions:

1. In a large stainless steel pot (no aluminum), melt the coconut into the olive oil and remove from heat.
2. Carefully, using eyeglasses, face mask, and gloves, pour the lye into the water (never water into the lye) and stir until dissolved.
3. When oil mixture and lye water is between around 90 degrees Fahrenheit, pour the lye water into the oil mixture and blend with a stick blender. You can use a hand mixer if that’s all that you have. Blend on and off until the soap reaches light trace. Castile soap is known to take a long time to come to trace, so don’t get discouraged if it doesn’t thicken like other soaps before having to pour into the mold.
4. When mixture forms a trace, add the essential oil and blend.
5. Pour into a prepared mold and insulate if your home is below 70 degrees Fahrenheit. Let it sit for 24 hours.
6. After 24 hours, remove the soap from the mold and cut. If it’s too soft to remove from the mold, check back after another 24 hours. After cutting, allow to cure for 3-6 weeks to fully harden.

Notice I advised to use essential oils, not fragrance oils.  For more on the difference and dangers of fragrance oils Click Here.

I’ve included a printable version below.SaveSave