Skincare Glossary

Carbon processed to be ultra-porous, used to bind oil and impurities and add a dramatic black color. A staple of detox and clarifying bars for oily or congested skin.

A cooling, hydrating succulent gel that soothes and calms the skin. Pairs beautifully with mineral-rich botanicals in a balancing daily bar.

A highly absorbent clay that draws out oil and impurities, giving a satisfying 'slip.' Popular in bars aimed at oily and acne-prone skin.

A soap made entirely (or almost entirely) from olive oil. Famously mild and low-lather, it's a classic choice for babies and reactive skin. Named for the Castile region of Spain.

A hard, fragrant butter pressed from cacao beans. It firms up the bar and leaves a protective, moisturizing film on the skin. Naturally smells faintly of chocolate unless deodorized.

Delivers big, fluffy lather and a hard, cleansing bar. Used in excess it can be drying, so it's balanced with conditioning oils and a generous superfat.

A soap-making method where oils and lye are combined and left to saponify without external heat. It preserves the natural glycerin and gives full control over every ingredient. Cold-process bars then cure for 4–6 weeks to harden and mellow.

Finely milled oats that soothe itch and calm irritation while adding gentle exfoliation. Recognized for comforting eczema-prone and reactive skin.

The 4–6 week resting period after a cold-process bar is cut. Water evaporates (making a harder, longer-lasting bar), the pH mellows toward skin-friendly levels, and the lather becomes creamier. Patience is an ingredient you can't see on the label.

An aromatic oil distilled or pressed directly from a plant. Natural and complex — but 'natural' still means it must be dosed correctly, since some essential oils are potent skin sensitizers at high levels.

A bright, camphorous essential oil with a cooling, decongesting effect — the signature scent of shower steamers and invigorating morning bars.

A blended aroma compound (natural and/or synthetic) formulated for scent. A well-made fragrance oil can be fully skin-safe and IFRA-compliant — the right question isn't 'natural or not,' it's 'is it within safe limits for this product.'

A natural humectant — it draws moisture from the air into your skin — produced during saponification. Handmade soap keeps its glycerin; many commercial bars strip it out to sell separately. It's a big reason real soap feels less drying.

A natural humectant and antioxidant that boosts lather and draws moisture to the skin. Soothing and gently antibacterial — lovely in milk-and-oat bars for sensitive skin.

An ingredient that attracts and holds water against the skin, helping it stay hydrated. Glycerin, honey, and aloe are humectants we lean on.

The International Fragrance Association, which sets global safety standards and maximum usage levels for fragrance ingredients based on how a product is used. Every one of our scent blends is dosed within IFRA limits. See our Fragrance Safety guide.

A mild white cosmetic clay that gently absorbs excess oil and adds silky 'slip' to the lather (great for shaving bars). The most gentle clay — suitable for sensitive and dry skin.

A naturally derived brightening active (from fermented rice/fungi) that helps fade dark spots and even skin tone over time. Best paired with daily SPF, since brightening skin is more sun-sensitive.

A calming floral essential oil prized for its soothing, relaxing aroma. A go-to for bedtime bath products and sensitive-skin blends.

The strong alkali that drives saponification — sodium hydroxide (NaOH) for solid bars, potassium hydroxide (KOH) for liquid soap. It's fully consumed in the reaction, so a properly made, cured bar contains no lye. Without it, there is no real soap.

An essential mineral applied topically (as a spray or soak) to support muscle relaxation and recovery. The active behind our therapeutic magnesium spray.

A gentle, conditioning oil that makes a mild, low-bubble bar prized for sensitive skin. A 100% olive-oil soap is known as Castile. Rich in oleic acid; very skin-loving.

Papain, a fruit enzyme from papaya that provides gentle enzymatic exfoliation — dissolving dull surface cells to reveal brighter skin without harsh scrubbing.

A measure of acidity/alkalinity. Skin sits slightly acidic (~4.5–5.5); true soap is mildly alkaline (~9–10). Your skin's acid mantle rebounds within an hour of washing, so a well-cured bar is gentle despite the higher pH.

The chemical reaction between fats/oils and lye (sodium hydroxide for bar soap, potassium hydroxide for liquid soap) that produces soap and glycerin. This is the ancient process at the heart of all true soap-making — and when it's complete, no lye remains in the finished bar.

A mineral- and antioxidant-rich seaweed that nourishes and conditions while supporting skin balance. Adds a gentle, ocean-derived boost to everyday bars.

A rich plant butter from the African shea tree, loaded with fatty acids and vitamins. Added at trace as a superfat, it brings deep moisture and a soft, conditioned finish — a favorite for dry and mature skin.

A common synthetic detergent surfactant (SLS) used in many 'cleansing bars' and washes. It foams aggressively but can over-strip natural oils and irritate sensitive skin. You won't find it in our bars.

Adding extra oils/fats beyond what the lye can saponify. This leaves a small percentage of unsaponified, conditioning oils in the final bar, making it more moisturizing. Typical superfat: 5–8%.

Short for synthetic detergent — a lab-made surfactant bar engineered to mimic soap. Often pH-adjusted but can strip natural oils and exclude glycerin. By FDA rules these usually can't be labeled 'soap,' so they're sold as 'beauty' or 'cleansing' bars.

Rendered beef fat that produces an exceptionally hard, creamy, long-lasting bar with a gentle, lotion-like lather. A traditional soap fat whose fatty-acid profile is remarkably close to skin's own.

An essential oil with clarifying, blemish-fighting properties, popular in bars for acne-prone skin. Potent, so it's always dosed within safe IFRA limits.