What's Actually in Your Soap? The Chemistry Case for Going Handcrafted

Walk down any drugstore aisle and you'll find dozens of soap options stacked floor to ceiling. They're cheap, they smell nice, and they've been around forever. So why are more and more Americans ditching those familiar bars for handcrafted alternatives? Turns out, the answer has less to do with trends and a whole lot more to do with chemistry.

At Alada Soap, we're pretty passionate about what goes into every bar we make — and equally passionate about what doesn't. So let's break down the real science behind cold process soap-making and why it matters for your skin.

First, What Even Is Soap?

At its most basic level, soap is the result of a chemical reaction called saponification. When fats or oils combine with an alkali (usually sodium hydroxide, also known as lye), they transform into soap and — here's the key part — glycerin.

Glycerin is a naturally occurring humectant, which means it pulls moisture from the air and holds it against your skin. It's genuinely good stuff. Dermatologists frequently recommend glycerin-based products for people with dry, sensitive, or eczema-prone skin because it supports the skin's natural moisture barrier without clogging pores.

Here's where it gets interesting: in cold process handcrafted soap, that glycerin stays right in the bar. It's part of the finished product, doing its job every time you lather up.

What Happens in Mass Production

Commercial soap manufacturers — we're talking the big household names — follow a fundamentally different process. They use high heat to speed things up (this is often called the "hot process" or continuous manufacturing method), and then they extract the glycerin before the soap ever hits store shelves.

Why would they do that? Because glycerin is worth more as a standalone ingredient. It gets sold separately for use in lotions, cosmetics, and pharmaceuticals. What you're left with is a bar that's been stripped of one of its most skin-friendly components.

To compensate, manufacturers add synthetic detergents, artificial fragrances, preservatives, and a cocktail of other additives. Many commercial "soaps" aren't even technically soap by FDA standards — they're classified as synthetic detergent bars (syndet bars) or cosmetics, which is why you'll sometimes see "beauty bar" or "cleansing bar" on the packaging instead of the word soap.

Cold Process: The Slow, Intentional Alternative

Cold process soap-making works differently, and the name tells you a lot. Oils and lye are combined at relatively low temperatures — usually below 110°F — and the saponification reaction happens slowly over 24 to 48 hours as the soap sets in the mold. After that, the bars cure for four to six weeks.

That timeline isn't inefficiency — it's intentional. The slow cure allows:

• Excess water to evaporate, creating a harder, longer-lasting bar
• Full saponification to occur, ensuring no active lye remains
• Beneficial compounds in the oils to remain largely intact
• Glycerin to stay naturally distributed throughout the bar

Because cold process soapmakers have full control over their oil blends, they can choose ingredients specifically for their skin benefits. At Alada Soap, for example, we carefully select oils like olive, coconut, and shea butter based on their unique fatty acid profiles — each one contributing something specific to how the bar performs on skin.

The Skin Barrier Connection

Dermatologists have been increasingly vocal about the importance of the skin barrier — that outermost layer of skin that keeps moisture in and irritants out. Harsh surfactants found in many commercial bars (sodium lauryl sulfate is a common one) can disrupt this barrier over time, leaving skin feeling tight, dry, and reactive.

Dr. Hadley King, a board-certified dermatologist frequently cited in publications like Allure and Healthline, has noted that for people with sensitive or dry skin, choosing gentler, glycerin-rich cleansers can make a meaningful difference. While she's not specifically endorsing any brand, the broader dermatological consensus points toward milder cleansers as a better fit for skin health.

Cold process soap, with its retained glycerin and carefully selected oils, aligns with that guidance in a way that most commercial bars simply don't.

But What About the Lye?

This is probably the most common question we get, and it's a fair one. Yes, lye (sodium hydroxide) is used in cold process soap-making. No, it does not remain in the finished bar.

This is saponification doing its job. The lye is completely consumed in the chemical reaction with the oils. What you end up with is soap and glycerin — no active lye whatsoever. A properly made cold process bar is gentle, pH-balanced for cleansing, and safe for everyday use.

The key phrase there is properly made. This is why sourcing your handcrafted soap from a trusted maker matters. At Alada Soap, every batch is formulated with a built-in superfat — meaning we use slightly more oil than the lye can react with. That excess oil remains free in the bar, adding extra moisturizing properties and providing an additional safety buffer.

Reading Labels Like a Pro

Next time you pick up a bar — at the store or online — flip it over and look at the ingredients. On a well-made cold process soap, you'll typically see things like:

• Saponified [oil name] (e.g., saponified olive oil, saponified coconut oil)
• Shea butter or other botanical butters
• Essential oils for fragrance
• Natural colorants like clays, botanicals, or oxides

On a commercial bar, you're more likely to see sodium tallowate (rendered beef fat), sodium lauryl sulfate, tetrasodium EDTA, titanium dioxide, and a string of fragrance compounds that can be derived from hundreds of undisclosed chemicals.

Neither list is inherently evil — but knowing what you're looking at helps you make an informed choice for your skin.

The Bottom Line

Choosing a cold process handcrafted soap isn't about being trendy or buying into a lifestyle aesthetic (though we won't pretend our bars don't look beautiful). It's about understanding what's happening at a chemical level and deciding that your skin deserves ingredients that were chosen with intention.

The science is pretty clear: glycerin matters, harsh surfactants can cause problems, and the slow, careful process of cold process soap-making produces a genuinely different product than what rolls off an industrial line.

At Alada Soap, every bar we craft is a direct reflection of that belief — pure ingredients, handled with care, made to actually work with your skin rather than against it. Once you make the switch, it's pretty hard to go back.