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DIY Herbal Soap Making From Scratch + Recipe

Fresh homemade bars of soap laying out with fresh herbs as a garnish

Besides being a practical skill to know, making your own soap from scratch is a fun way to express yourself creatively while producing something that's useful and great for your skin. By following this simple recipe, you can make basic unscented bars of soap, or customize them by adding organic herbs, flowers, essential oils, and other skin-loving ingredients.

In times past, our foremothers made their own soap using animal fat and a wood ash solution deemed ready when it was caustic enough to dissolve a chicken feather. These days, the modern soap maker uses a standardized lye, called sodium hydroxide, to ensure consistent and reliable results.

You may wonder, as I did too, how a strong substance such as lye can produce soaps gentle enough to use on even the most sensitive skin types.

While it doesn’t seem to make sense at first thought, from a chemistry standpoint it’s absolutely necessary. You must use a highly alkaline solution, such as sodium hydroxide, in order to transform oils into soap. In the presence of heat and water, the fatty acids and glycerol in oils bond with the sodium and hydroxide portions of lye to form brand new substancessoap, plus glycerinwhich are great for your skin. No lye remains in the final soap.

Natural homemade soap made laying with fresh herbs on bricks

DIY Herbal Soap Recipe

Equipment

  • Digital scale: ingredients are measured by weight, not volume
  • Thermometer: to monitor temperatures
  • Immersion blender: for easier mixing
  • Container for lye solution: stainless steel or heavy-duty plastic (recycle #5)
  • Container for mixing soap: stainless steel, heavy-duty plastic, or heatproof glass
  • Gloves & goggles: to protect hands and eyes
  • Safety mask or respirator: to protect respiratory system
  • Spatulas & spoons: silicone or heatproof plastic
  • Soap mold: 2.5 lbs. soap mold, empty milk carton, or silicone molds

Important: Don’t use aluminum or non-stick equipment since those substances react negatively with lye.

Ingredients

This recipe yields around 2.5 lbs. of soap, or about 7 to 8 bars when using a loaf mold. 

Directions

If you’re a new to soap making, be sure to review the tips and tricks below before you get started.

  1. Put on your goggles, gloves, and mask.
  2. Weigh water (or herbal infusion) into stainless steel or heavy-duty plastic container.
  3. Weigh lye into a small cup.
  4. Slowly sprinkle lye into the water.
  5. Stir well until lye completely dissolves.
  6. Place lye solution in safe area and cool for 30 to 40 minutes, or until it's about 100 to 115 degrees F.
  7. Melt coconut oil and butter over low heat, then combine with other oils.
  8. Cool combined oils until they’re around 95 to 115 degrees F.
  9. Pour cooled lye solution into warm oils.
  10. Use combination of hand stirring and short bursts of the immersion blender to mix oils and lye solution.
  11. Mix until soap reaches trace.
  12. Pour soap into mold.
  13. If you’d like, use spoon to texture the top of soap then decorate with flower petals such as cornflower, calendula, or rose.
  14. Cover soap lightly with piece of wax paper or parchment paper.
  15. Cover with towel or blanket to insulate.
  16. Allow to set for one to two days before removing from mold.
  17. Turn out soap on a piece of wax paper.
  18. Cut soap into bars.
  19. Space bars out on wax paper or coated cooling rack ensuring plenty of airflow between them.
  20. Rotate every few days allowing for an even cure.
  21. Cure in open air for 4 to 6 weeks before use.

Fresh homemade soap with herbs on top sitting in mold waiting to dry

Tips & Tricks

  • When mixing, your lye solution will get hot quickly, so be sure to handle with care.
  • Work outside, in front of an open window, or under an exhaust fan and avoid breathing in the momentarily strong fumes.
  • When combining your warmed oils and lye solution, don’t overuse the immersion blender or you’ll create excess air bubbles, and the soap will thicken too quickly.
  • When you’ve reached trace, the soap batter will have a consistency similar to thin pudding or warm custard. You can test for “trace” by drizzling a spoonful of the soap batter across its surface in the mixing bowl. It should leave a brief but noticeable mark, or tracing, before sinking back in. Trace usually takes anywhere from 3 to 10 minutes to reach, depending on ingredient temperatures and how often you use the immersion blender.
  • If you’re making soap when your house is cold, cover it with a few extra layers.
  • It’s okay to briefly peek at your soap every now and then. If you see a crack developing, that means it’s getting too hot and should be uncovered and moved to a cooler area.
  • After an hour or two after mixing, you'll notice that the soap is getting darker in the middle and might look jelly-like in spots. This stage is called gel phase and is perfectly normal.
  • If your soap is still a bit soft when you turn it out of your mold wait a few days before cutting it into bars.

Glass bowls filled with cornflowers and other colorful herbs

Customizing Your Recipe

There are several ways to incorporate herbs, flowers, and other nourishing ingredients into soap recipes. While some herbal constituents won’t survive the soap making process, others are surprisingly resistant to the alkaline conditions and heat.

Instead of plain distilled water, try using a chilled herbal tea in its place. It can be as simple as chamomile tea or hydrosol, or a complex blend of your favorite herbs. Take note that a strong dark tea will often yield soap with a brown hue, while some herbs, such as organic chlorella and wheatgrass, act as natural colorants.

Another way to enrich your soaps is to infuse all or part of the oils with skin soothing herbs, including organic calendula, organic chamomile, or organic plantain. Some herbs and flowers will add a subtle hint of color to your soap as well.

A third way to incorporate ingredients such as oatmeal, honey, essential oils, clay, or organic herbal powders is to blend them into the soap batter when you reach trace.

Sealed bags filled with Mountain Rose Herbs chamomile flower powder and chickweed powder

3 Ways to Customize

The following examples show how easy it is to create unique variations using the same simple soap recipe above, with the addition of just a few additives.

Chamomile & Honey Soap

Make the soap as directed, adding 1 1/2 tsp. organic chamomile flower powder and 1 1/2 tsp. honey at trace.

Tip: Dilute the honey with an equal amount of warm water first to help it mix into the soap batter more readily.

French Green Clay & Peppermint

Make the soap as directed, adding 1 Tbsp. french green clay and 24 grams organic peppermint essential oil at trace.

Tip: Dilute clay with 2 to 3 times the amount of water first to make sure it blends into the soap evenly.

Chickweed & Oatmeal

Make the soap as directed, adding 1 1/2 tsp. organic chickweed powder and 1 Tbsp. ground oatmeal at trace.

Tip: Process rolled oats from the grocery store in a coffee grinder to form a fine oatmeal powder that’s perfect for soap making. Avoid using larger pieces as they can mold.

Making your own soap from scratch is an enjoyable pastime that will reward you with lovely bars of soap containing ingredients that you can feel good about using. Once you make that first successful batch, you’re likely to be hooked. There’s a world of ingredient options to explore and virtually unlimited ways to combine them!

 Bar of homemade herbal soap laying on a pile of dried herbs, leaves, flowers

Looking for more soapy Herbal Fun?

Try Our DIY Hand Soap Recipe!


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This blog was originally published in 2015. Because it's so popular, we decided to update it for you. Enjoy! 

Topics: Natural Body Care, Recipes, Green Living

Jan

Written by Jan on March 12, 2018

Jan Berry is the soapmaker and herbalist behind The Nerdy Farm Wife. She’s also the author of Simple & Natural Soapmaking and 101 Easy Homemade Products for Your Skin, Health & Home. Jan lives on a small farm in the Blue Ridge Mountains with her husband and two teenagers, where she enjoys gardening, crafting pretty herbal concoctions, caring for a menagerie of animals and, of course, soapmaking.