DIY Shea Butter Soap Recipe for Rich, Deep Moisture at Home

Katie Shaw

A nourishing, beginner-friendly cold-process soap that creates a hard, moisturizing bar.

Equipment

• Stick blender
• Safety gear (goggles, gloves, long sleeves)
• Digital scale
• Heatproof glass or stainless steel bowls and a large pot

Ingredients

• 11 ounces coconut oil
• 11 ounces olive oil
• 11 ounces palm oil
• 5 ounces shea butter
• 5.43 ounces lye (sodium hydroxide)
• 10–14 ounces water (I use 12 ounces)
• 3 tablespoons fragrance oil (adjust by scent strength)

Instructions

1. Make the lye water. Using a digital scale, measure lye and water in separate heatproof containers. Slowly add the lye to the water (never pour water into lye). Stir until dissolved. The mixture will heat quickly—place it in a well-ventilated, secure area to cool. Safety: wear gloves and goggles and keep children and pets away.
   
2. Melt the oils and shea butter. Measure coconut oil, olive oil, palm oil, and shea butter. Combine in a large stainless steel pot and melt over low heat until 130–140°F (54–60°C). Remove from heat and allow to cool.
   
3. Check temperatures. After about 2 hours, the lye solution and oils should be around 110°F (43°C). A range of 100–120°F (38–49°C) is acceptable. If too warm, let them cool further until within range.
   
4. Prep mold and mix-ins. Ready your mold and any fragrance or colorants. If using colorants, pre-dilute them in a bit of melted oil for even distribution.
5. Stick blend to trace. Pour the cooled lye solution slowly into the oils. Use a stick blender to mix until a light trace—when a trail of batter briefly stays on the surface—usually about one minute. Add fragrance or color at this point and stir by hand until incorporated.
   
6. Pour into mold. Immediately pour the batter into your prepared mold and smooth the top. Leave uncovered and let the soap sit at room temperature for 24 hours.
   
7. Unmold and cut. After 24 hours, unmold and cut into bars. Cure the bars in a well-ventilated area for at least 3 weeks before use to allow them to harden and mild saponification to finish.
   

Notes

Always wear safety gear when handling lye and soap batter. The lye solution can release fumes and cause burns if spilled—work in a ventilated area and keep it away from children and pets.

Use distilled water for more consistent results; tap water minerals can affect texture. Avoid over-blending to prevent an overly thick batter that is hard to pour. Aim for a light trace.

Don’t leave soap in the mold more than 24 hours or it may be difficult to cut. After cutting, allow bars to cure in a cool, dry place away from direct sunlight.

If using multiple fragrance oils, blend them together first for an even scent. Silicone molds are beginner-friendly because soap releases cleanly.

Can I skip the lye and still make soap?

No—lye is essential for cold-process soap. If you don’t want to handle lye, use a melt-and-pour soap base that’s already saponified.

What happens if I don’t let the soap cure for the full 3 weeks?

Using soap too soon results in a softer bar that won’t last as long. Curing allows excess water to evaporate and the bar to harden, improving longevity and mildness.

Can I use a different butter instead of shea butter?

Yes—mango or cocoa butter can substitute, but they will alter the soap’s texture and moisturizing qualities.

How do I know when the soap has reached trace?

Trace is reached when the batter thickens enough that a drizzled line briefly remains on the surface before sinking. With a stick blender it often takes about a minute—avoid over-blending.

Can I add exfoliants like oatmeal or coffee grounds?

Yes—add them after reaching trace and before pouring. Use finely ground exfoliants so they’re gentle on skin.