How to Make Beer Soap (Cold Process Recipe and Tips)

Beer soap produces a dense, creamy lather that regular water-based soap can't match. The sugars in beer boost bubbles, the hops add skin-soothing properties, and the grain proteins contribute to a silky feel on skin.

The process is nearly identical to standard cold process soap, with one critical step: you need to properly degas and prepare the beer before adding lye. Skip that step and you'll get a foaming, overheating mess. Get it right and you'll have some of the best-lathering bars you've ever made.

Why Use Beer in Soap?

Beer replaces some or all of the water in a cold process recipe. When you dissolve lye in beer instead of plain water, the sugars and proteins from the brewing process carry over into the finished bar.

More lather. The sugars in beer increase bubble production. Beer soap tends to lather more easily and with a creamier texture than water-based soap.

Skin-conditioning properties. Beer contains B vitamins, amino acids, and antioxidants from hops. These won't survive saponification in large quantities, but the overall effect is a bar that feels gentler on skin.

A unique product. If you sell soap or give it as gifts, beer soap stands out. It pairs well with masculine scents like cedarwood, pine, or sandalwood, and the story behind the bar sells itself.

Beer soap does not contain alcohol in the finished product. The lye reaction and the curing process eliminate all alcohol content.

Choosing the Right Beer

Not all beers produce the same results in soap. The style you choose affects color, scent, and lather quality.

Stouts and porters are the top choice for beer soap. They're high in sugars and proteins, produce a rich brown color naturally, and pair well with earthy or woody scents. Guinness is a popular option, but any quality stout works well.

Pale ales and IPAs produce a lighter-colored bar. The higher hop content means more of those skin-soothing compounds. The finished soap may have a slight golden or amber tone.

Wheat beers add extra protein, which boosts the creamy quality of the lather. They produce a pale bar that works well if you want to add colorants.

Lagers are the most neutral option. They contribute lather-boosting sugars without strongly affecting the color or scent. A good choice if you want the benefits of beer soap without the visual characteristics.

What to avoid: Flavored beers with artificial ingredients, fruit beers (the added sugars can cause overheating), and anything with a very high alcohol content (above 8% ABV). The higher the alcohol, the more volatile the lye reaction.

Can You Use Non-Alcoholic Beer?

Yes. Non-alcoholic beer works fine and is actually easier to work with because there's less alcohol to boil off. You still get the sugars and proteins that improve lather.

How to Prepare Beer for Soap Making

This is the most important step. Beer contains carbonation and alcohol, both of which cause problems when you add lye.

Carbonation + lye = volcano. If you add lye to carbonated beer, the reaction produces massive foaming that can overflow your container. This is dangerous with a caustic lye solution.

Alcohol + lye = extreme heat. Alcohol reacts aggressively with sodium hydroxide, producing much more heat than water does. This can scorch the sugars and turn your lye solution dark brown with a terrible smell.

Degassing Method (Required)

1. Open the beer 24-48 hours in advance. Pour it into a wide, open container and leave it uncovered at room temperature. Stir it occasionally to release more carbonation.

1. Simmer to remove alcohol. Pour the flat beer into a saucepan and bring it to a gentle simmer (not a full boil) for 15-20 minutes. This evaporates the alcohol. Let it cool completely.

1. Freeze into cubes. Pour the prepared beer into ice cube trays and freeze solid. Adding lye to frozen beer cubes gives you the most control over temperature and prevents scorching.

The freeze method is borrowed from milk soap making and works for the same reason: frozen liquid absorbs heat gradually, preventing the sugars from burning.

Beer Soap Recipe

This recipe produces approximately 6 bars of rich, well-lathering beer soap.

Oil Blend

Lye and Liquid

• Superfat: 5%
• Lye (NaOH): Use the Soaply calculator with your exact oil weights
• Liquid: Prepared, degassed, frozen beer (replaces all water)
• Sodium lactate (optional): 1 tsp per pound of oils to help with unmolding

Expected Bar Properties

• Hardness: 41
• Cleansing: 14
• Conditioning: 53
• Bubbly: 21
• Creamy: 40
• INS: 152

The cocoa butter and shea butter together produce a hard bar that unmolds well despite the added sugars. The castor oil at 7% works with the beer sugars to create abundant, creamy lather.

Optional Additions at Trace

• Cedarwood essential oil at 5% fragrance load for a woody, masculine scent
• Colloidal oatmeal (1 tbsp per pound of oils) for extra skin soothing
• Honey (1 tsp per pound of oils) to boost the sugar-enhanced lather even further. Be cautious with honey and beer together as both increase the chance of overheating.

Step-by-Step Instructions

1. Prepare Your Beer (Day Before)

Open the beer and pour into a wide container. Let it sit uncovered for 24 hours, stirring a few times. Then simmer for 15-20 minutes to remove alcohol. Cool completely and freeze into cubes.

2. Make the Lye Solution

Place your frozen beer cubes in a heat-safe container. Slowly sprinkle measured lye over the cubes, stirring gently. The lye will melt the cubes gradually.

Go slowly. Add a tablespoon of lye at a time and stir. The solution will turn amber or brown as the sugars react. This is normal. If you dump all the lye at once, the temperature spike can scorch the sugars badly.

The finished lye-beer solution will be darker than a standard lye-water solution. It may smell unusual during mixing, but this doesn't affect the finished soap.

3. Prepare the Oils

Melt the coconut oil, shea butter, and cocoa butter over low heat. Remove from heat and add the liquid oils (olive, almond, avocado, castor, rice bran). Stir to combine and let cool to 90-100F (32-38C).

4. Combine and Blend

When both the lye solution and oils are around 90-100F, pour the lye solution through a fine strainer into the oils. Strain out any scorched sugar particles.

Stick blend to light trace. Beer soap can accelerate faster than water-based soap due to the sugars. Work at a cooler temperature and use shorter blender bursts to keep control.

5. Add Fragrance and Pour

Add any essential oils or fragrance at light trace and stir by hand. Pour into your mold quickly if the batter is thickening.

6. Manage the Temperature

Beer soap runs hot. The sugars in the beer generate extra heat during saponification. Do not insulate the mold. In fact, consider placing the mold in the refrigerator or freezer for the first 24 hours to prevent overheating.

If beer soap gets too hot, it can crack, develop a glycerin river pattern, or go through a partial gel that looks uneven. Keeping it cool produces a smoother, more uniform bar.

7. Unmold and Cure

Unmold after 48-72 hours. If the bars feel sticky (common with sugar-containing soaps), give them an extra day. Cut into bars and cure for 4-6 weeks on a drying rack with good airflow.

Troubleshooting Beer Soap

The lye solution turned very dark brown or black

You added lye too quickly and the heat scorched the sugars. The soap may still be usable, but the bar will be darker than intended and may have a slight caramel scent. Next time, use frozen cubes and add lye more gradually.

The soap overheated and cracked

Beer soap generates more heat than water soap. Place the filled mold in the refrigerator next time. If the crack is only on the surface, the soap is still safe to use, just cosmetically imperfect.

The batter seized or traced too fast

Sugars accelerate trace. Work at a lower temperature (85-90F instead of 100-110F), use a slower-tracing oil blend (more olive oil), and blend in very short bursts. Avoid fragrance oils known to accelerate, as the beer is already speeding things up.

The soap smells bad during the first week

Normal. The combination of saponifying beer and lye produces strong odors that fade entirely during the cure. Judge the scent after 4 weeks, not 4 days.

Glycerin rivers appeared in the bar

These translucent streaks happen when the soap partially gels unevenly, which is common in sugar-rich soap. They're purely cosmetic and don't affect performance. Prevent them by keeping the temperature low and avoiding gel phase entirely.

💬 Frequently Asked Questions

Does beer soap smell like beer?

No. The alcohol evaporates during prep, and saponification transforms the remaining sugars and proteins. The finished bar smells like whatever fragrance you add, or neutral if you leave it unscented. There's no beer scent in the cured bar.

Does beer soap contain alcohol?

No. Between the simmering step (which evaporates alcohol), the lye reaction (which destroys organic compounds), and the 4-6 week cure, zero alcohol remains in the finished soap.

How much beer do I need per batch?

Use beer as a 1:1 replacement for water. Whatever amount of water the Soaply calculator calls for, use that same weight in prepared, degassed beer.

Can I use homebrew?

Absolutely. Homebrew works great and adds a personal touch, especially if you're giving the soap as gifts. Just make sure it's fully fermented and follow the same degassing process.

Can I combine beer with milk soap?

You can, but it gets tricky. Both beer and milk contain sugars that generate extra heat. If you want to try it, use half beer and half milk (both frozen into cubes), and definitely refrigerate the mold. See our milk soap guide for milk-handling tips.

Start Your Beer Soap Batch

Beer soap is one of those recipes that sounds gimmicky but genuinely produces a better bar. The sugar-boosted lather is noticeable, and bars made with stout have a beautiful natural brown color that doesn't need any added colorant.

Grab your favorite brew, degas and freeze it, then plug your oil weights into the Soaply calculator for exact lye amounts. For more unique recipe ideas, explore our coffee soap guide, goat milk soap recipe, or the honey oatmeal soap tutorial.