What's Actually in Most Store-Bought Soap (And Why It Matters for Your Skin)
Here's a fun little experiment: go pick up the bar of "soap" sitting in your shower right now and flip it over.
If it says anything like beauty bar, cleansing bar, moisturizing bar, or body bar — but nowhere does it say the word soap— there's a reason for that.
It's legally not allowed to.
Wait, It's Not Soap?
Yep. Most of what gets sold in the soap aisle isn't actually soap by the FDA's definition. Real soap is made from a chemical reaction between fats or oils and an alkali (like lye). That reaction — called saponification — creates something that cleans skin gently and leaves behind natural glycerin.
What most big brands sell instead is a synthetic detergent bar — a product formulated with surfactants, foaming agents, and petroleum-derived ingredients that mimic what soap does, but not in the same way. They're classified as cosmetics, not soap, which is why the label language has to be very careful.
This isn't just a technicality. It matters for your skin.
The Ingredient List Nobody Reads
Let's walk through what's commonly hiding in a standard commercial bar:
Sodium Lauryl Sulfate (SLS) or Sodium Laureth Sulfate (SLES) These are the heavy-duty foaming agents responsible for that satisfying lather. They're also known skin irritants — especially for people with sensitive or dry skin — because they strip the skin's natural oils along with the dirt.
Fragrance (the undisclosed kind) Let's be clear here: fragrance itself isn't the villain. People love a great-smelling bar of soap, and there's nothing wrong with that. The issue is undisclosed fragrance — the kind where "fragrance" on an ingredient list is a legal catch-all that can represent dozens (sometimes hundreds) of individual chemical compounds, including phthalates, which are plasticizing chemicals used to make scent last longer on skin. Brands aren't required to tell you what's actually in their fragrance blend.
At Hemlock Springs Soaps, we use fragrance too — because a bar that smells amazing is a bar people actually use. The difference is we use phthalate-free fragrance oils. You get the scent, without the stuff that shouldn't be in there. It's not about being fragrance-free. It's about being honest about what's in the bottle.
Parabens and Preservatives These extend shelf life — helpful for a product that needs to sit on a store shelf for two years. Whether they're harmful is still debated, but many people prefer to avoid them, especially in something used daily.
Sodium Tallowate or Sodium Palmate These are the actual cleansing agents in many bars — derived from beef tallow or palm oil. Palm oil itself isn't a bad ingredient (we actually use it in our bars — sustainably harvested). The problem in commercial processing is twofold: sourcing is rarely transparent or sustainable, and the glycerin is stripped out during processing and sold separately. So you lose the skin-softening benefit that should naturally be there.
Glycerin — or the Lack of It This is the big one. Glycerin is a natural byproduct of the soapmaking process and it's a humectant — it draws moisture to your skin. In real handcrafted soap, glycerin stays in the bar. In commercial processing, it's removed and sold separately (ever notice how many lotions have glycerin as a main ingredient?). So you wash with a bar that strips moisture, then reach for lotion to put it back.
Convenient for the companies selling both. Not so great for your skin.
So What's in Real Soap?
Handcrafted cold process soap — the kind made in small batches by people who actually care about what goes on your skin — has a much shorter and more recognizable ingredient list.
At Hemlock Springs Soaps, a typical bar contains things like:
- Goat milk (loaded with lactic acid and natural fats that are gentle and nourishing)
- Olive oil (moisturizing, gentle, suitable for sensitive skin)
- Coconut oil (creates a conditioning lather)
- Sustainably harvested palm oil (adds hardness and a stable, creamy lather)
- Castor oil (boosts lather and helps other oils bind together)
- Shea butter (extra moisture and skin-softening)
- Essential oils or phthalate-free fragrance oils for scent (because your soap should smell good — we just do it without the sketchy stuff)
- Lye (sodium hydroxide) — which sounds scary but fully reacts during saponification; there's none left in the finished bar
That's it. You can actually look up every ingredient and know what it does.
Why Does This Matter?
If your skin feels tight, dry, or irritated after showering — and you've been blaming your skin type — it might be worth taking a closer look at your soap first.
The skin is the largest organ in the body and it absorbs what you put on it. Using a product every single day that strips natural oils and leaves synthetic residue adds up over time. Switching to a real soap — especially one formulated for dry or sensitive skin — is one of the smallest changes that can make a noticeable difference.
Not sure which bar is right for your skin? Grab the free Dry Skin Soap Guide → It's a quick, practical download that walks you through what to look for in a soap if you deal with dryness, sensitivity, or that dreaded tight-after-showering feeling.
Your skin has been dealing with that drugstore bar long enough. Let's do better.
Hemlock Springs Soaps are handcrafted in small batches in New Hampshire using real ingredients you can actually pronounce. Shop the collection →