Spirulina Matcha Bath Bombs recipe
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5 from 4 votes

Dried Spirulina & Matcha Bath Bombs


  • 2 cups baking soda
  • 1 cup powdered buttermilk
  • 1/4 cup arrowroot
  • 1/4 cup kaolin clay
  • 1/4 cup dead seal salts
  • 1/3 cup coconut oil
  • 1 tablespoon cupuacu butter
  • 10-20 drops of clary sage essential oil
  • 1-2 tablespoons spirulina powder
  • 1-2 tablespoons green tea Matcha powder
  • Stainless steel bath bomb molds
  • Spray bottle filled with rubbing alcohol
  • 1 large mixing bowl
  • 2 smaller mixing bowls


  • Steps 1-6: In a large mixing bowl, add the baking soda, buttermilk, arrowroot powder (this is an organic and eco-friendly starch), kaolin clay and dead sea salts. Whisk dry ingredients together.
  • Step 7: Add the coconut oil. This binds all the ingredients together, so you don’t have bath bombs that crumble. You can also use 90% isopropyl alcohol, but I feel the coconut oil holds the mixture together more effectively.
  • Step 8: Add the cupuacu butter. This gives your bath bombs more stability and hardens them, so you bath bombs don’t crumble when you touch them. It also is excellent for moisturizing your skin.
  • Steps 9-11: Add the clary sage essential oil. Mix ingredients thoroughly. You may need to use your hands to break down any lumps and make sure everything is mixed in. The mixture is perfect when it holds together when you press it into your hands and feels like wet sand. Separate mixture into two smaller bowls.
  • Steps 12-13: Mix in the spirulina powder in one bowl and the green tea Matcha powder in the other until completely incorporated into the mixture.
  • Step 14: Fill one side of the mold with the spirulina mixture and the other side with the green tea Matcha. You can also layer them in each side. Press molds together and grind to remove excess mixture. Gently tap each side of the mold to release the bombs.
  • Step 15: Allow to dry a minimum of 24 hours. If your climate is wet or cold, allow an additional 24 hours. My rule of thumb is that when it is hard to the touch, they are ready for the tub! Store in an airtight container until ready for use.


The number of bath bombs this recipe will make completely depends on which size bath bomb mold you use. For me, it made 1 large, 2 medium and 2 small.