How to Make Bath Bombs with Coconut MCT Oil

Bath bombs are a fun, customizable project for makers looking to experiment with bath and body products. With a handful of ingredients and a simple starting ratio, you can create your own bath bombs and adjust the formulation as you experiment with different fragrances and ingredients.

For this recipe, we used Coconut MCT Oil from Soaper’s Choice as our carrier oil.

Ingredients

For the dry ingredients, start with a simple 2:1:1:1 ratio:

  • 2 part baking soda
  • 1 part citric acid
  • 1 part bath salts
  • 1 part corn starch
  • Coconut MCT Oil, approximately 5–10% of the mixture
  • Essential oil or fragrance oil of your choice (We used lemon and orange)

You’ll Also Need

  • Large mixing bowl
  • Measuring cups
  • Mixing spoon or spatula
  • Bath bomb molds
  • A dry, well-ventilated area for the finished bath bombs to harden

How to Make Bath Bombs

1. Combine the Dry Ingredients

Add the baking soda, citric acid, bath salts, and corn starch to a large mixing bowl.

Mix thoroughly until all of the dry ingredients are evenly combined.

2. Add Your Fragrance

Add your chosen essential oil or fragrance oil to the dry mixture and mix thoroughly to distribute the fragrance throughout the batch.

3. Add the Coconut MCT Oil

Slowly add Coconut MCT Oil, mixing continuously as you go.

Start with a smaller amount and gradually incorporate more as needed, working within the approximately 5–10% range.

Adding the oil gradually gives you more control over the consistency and helps distribute it evenly throughout the dry ingredients.

4. Fill the Molds

Once the ingredients are thoroughly combined, firmly pack the mixture into your bath bomb molds.

If you're using a two-piece bath bomb mold, fill both halves and press them together firmly. Packing the mixture tightly can help the bath bombs hold their shape once removed.

5. Remove From the Molds

Carefully remove each bath bomb from the mold.

If the mixture isn't holding together as expected, make adjustments to your formulation before continuing with the rest of the batch.

6. Let the Bath Bombs Harden

Place the finished bath bombs in a dry, well-ventilated area for at least 24 hours.

Once completely hardened, they're ready to use or package.

Why We Used Coconut MCT Oil

For this batch, we chose Coconut MCT Oil from Soaper’s Choice. Its lightweight, liquid consistency makes it especially easy to incorporate into a dry bath bomb mixture.

Here are a few reasons makers may want to experiment with Coconut MCT Oil in bath bomb formulations:

Easy to Mix Into Dry Ingredients

Because MCT oil stays liquid at room temperature, it can be incorporated gradually into dry ingredients such as baking soda and citric acid. This makes it easier to distribute the oil throughout the mixture without creating the heavy, sticky clumps that can make molding more difficult.

Helps Create a Cleaner Bath Experience

Heavy oils can sometimes leave an oily residue behind in the tub. MCT oil's lightweight consistency can make it a useful option when developing bath bomb formulations.

Keeps the Formulation Visually Neutral

Coconut MCT Oil has a neutral appearance, making it useful when you don't want the added oil to noticeably alter the appearance of your bath bomb mixture. This can be especially helpful for makers who want greater control over the finished look of their products.

 

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