Natural Soap Bath Bars – DIY

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These are disintegratable bars that you crumble under running bath water to soak up all of their nourishing benefits. Similar to bath bombs, but without the bomb.

Now, I’m not going to lie, these were originally supposed to be natural bubble bars. I was determined that we could make a solid bubble bath bar without the slsa BUT as most of us know, natural castile soap does not lather into a bubble. I haven’t given up on the idea but as of right now, I don’t have a recipe that works.

I didn’t want to completely throw away this recipe because, let’s face it, they look pretty neat and can still be used in the tub.

They soften the water, balance pH levels, they contain natural soap, which contains lots of amazing oils and the oils are great for the skin!



  • Mixing Bowl
  • Parchment Paper
  • Whisk
  • Knife (or something to slice into bars)


In a large mixing bowl, measure out your corn starch & baking soda.

Pour melted coconut oil, and soap onto dry ingredients. Mix with a whisk until it starts to form a dough. If you’re adding essential oils you can mix them with the coconut oil and pour into the mixture. (Leave the colour out for now)

When a dough starts to form, use your hands to kneed into a consistent dough. (Use gloves if you’re gifting)

Once you have a good dough, separate into 2 equal parts. If it’s too sticky, you can add a bit more dry ingredients or if it’s too dry, add in a bit more soap or oil. You don’t want it so dry that it’s cracking when you try to form it, but not so sticky that you can’t roll it.

Using your natural colourant, colour one or both halves. (different colours) Mix with gloves.

(photos below)

Once you have a equal consistency, flatten your first colour on a baking soda sprinkled sheet of parchment paper.

Try to form in a bit of a rectangle shape if possible.

Next lay on your second colour and do the same thing. you can push the sides in to each other, there is no perfect science here.

Next start rolling your dough, with the parchment paper. Each rotation, release the parchment and start again. This will go slowly.

Once you have a log, you can start moulding it together so all the edges are tucked into a neat little log.

Using a sharp knife, start slicing through your log to form bars. (You can measure and score before you start cutting)

Natural Soap Bath Bar – Instructions

Let dry at least overnight or until they’re solid. (away from humidity) I’ve kept mine out several days.


Natural Soap Bath Bars

Crumble under running water until dissolved. Soak up the nourishing benefits.

I recommend Mountain Rose Herbs & Starwest Botanicals for all of your herbal healing needs!

For my Canadian Friends, you can purchase your oils at Harmonious Mind & check out our post on Canadian Suppliers for Essential Oils

You can purchase any extra supplies over at or Images Edited using PicMonkey & PSCS5. Some of the links here are affiliate sites, meaning if you make a purchase through one of my links, I earn a small commission. Thank you for supporting The Herbal Healing Mama. & Please also see my disclaimer. Thanks Friends.

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Briar Rose

Briar Rose - Canadian Mama to two beautiful boys, blessed wife to the most supportive husband, Positive Parenting, Natural Family Wellness & Motherhood. Saved by Grace, Lover of all things old. Antiques, Old Books and Old Homes. History and Ancestry. Refinishing or Restoring Furniture, Creating Rustic Designs, Ornate Antique, Primitive Decorating. Learning to bake, sharing on Old Recipe Book. Taking a break from Blogging @ Briar Rose Blog, The Herbal Healing Mama, & Rustic Reclaimed Designs. - Profile photo: Reflections of Life Photography.

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3 thoughts on “Natural Soap Bath Bars – DIY

  1. I was reading about lauroyl lactylate Nd looked up to see if it’s carcinogenic it says it’s not it’s a plant derived liquid like bubble for making soap it’s on Amazon I think I may substitute it for the Castile and see if that works.

  2. Are you sure 3/4 cup and2 tbsp of coconut oil is the same thing? I followed this recipe with 3/4 cup coconut oil and my mixture came out like a soup! In the end I had to add about 4 extra cups of baking soda and 2 extra cups of corn starch to absorb the liquid, but then the problem is, it wasn’t nearly bubbly enough ( I was scared to add more soap because then I would have to add more dry ingredients) any suggestions ?
    Thanks 🙂

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