Making your own shampoo bar is straightforward once you understand what each ingredient actually does. The names can look intimidating at first — SCI, CAPB, cetyl alcohol — but behind every unfamiliar term is a well-researched cosmetic ingredient with a specific job in the formula.
This is the part of Batch and Bubble I find most satisfying to write. Not just what goes into the recipe, but why. What each ingredient contributes, how it behaves during making, where to source it in Australia, and what happens to the finished bar if you adjust it. That kind of understanding is what turns a recipe follower into a confident formulator.
The guides below cover every ingredient in the current Batch and Bubble syndet shampoo bar recipe — one article per ingredient, written from real making experience rather than generic ingredient databases.
Not sure where to start?
If you’re new to syndet bar making, the beginner shampoo bar recipe is the place to begin. It introduces all six ingredients in context before you dive into the individual guides.
If you’re troubleshooting a bar that isn’t performing as expected, the free troubleshooting guide covers the most common problems and exactly how to fix each one.
Clay is the ingredient that does the most visible work in a syndet bar. It determines the colour, contributes to the cleansing profile, and tells you quite a lot about which hair or skin type the formula is built for. It also generates the most questions, because the options are genuinely different from each other…
Fractionated coconut oil in body bars: what makes it different from regular coconut oil, what it does for skin, and when to use it versus other conditioning fats.
Cocoa butter in body bars: what it does for bar hardness and skin feel, its pore-clogging rating honestly addressed, and how it differs from fractionated coconut oil and shea butter.
Jojoba oil appears in almost every natural skin care product. What it actually does: the real science, the marketing claims worth questioning, and why it earns its place.
Bentonite in a syndet shampoo bar: what it does differently from kaolin, my honest two-cents about the result, and who this formula actually suits.
Green Clay VS Kaolin. Both clays clean and absorb, but they’re not interchangeable. Here’s what makes them different and how to choose the right one for your formula.
French green clay is a stronger, more mineral-rich clay than kaolin — and that difference matters in a shampoo bar formula. Here’s what it is, what it does, and how it behaves in a tested recipe for oily hair.
Not all essential oils work in a shampoo bar. Some don’t survive heat, some aren’t skin-safe, and some don’t exist at all. Here’s what to know before you buy.
Shea butter adds deep moisture to conditioner bars without silicones. Here’s what it does, how it behaves in the melt phase, and why refined is the right choice.
Panthenol penetrates the hair shaft and improves moisture retention from the inside. Here’s what it actually does, why it’s in conditioner bars, and how to use it.