Formulating for sensitive skin: what baby care taught me about adult products
Rahmita Paramita Sudirman
Start milder than you think you need to
When people describe their skin as sensitive, they usually mean one of three things: it stings with fragrance, it tightens after washing, or it reddens in the first minutes of applying anything new. A formulation that handles all three rarely comes from softening an adult formula — it comes from starting at baby-level mildness and adding performance back carefully.
In practice that means choosing surfactants the way I do for Herbikids: replacing a heavy sodium-laurel base with amphoteric and glucoside-type cleansers that leave the barrier intact, and keeping the pH close to the skin's natural 5.5 instead of chasing a stronger feel of clean. Those two decisions alone prevent a large part of the complaints I used to see in adult cleansers.
Preservation is a formulation decision, not an afterthought
Sensitive-skin products are usually the ones marketed as 'free from', and free-from thinking often pushes preservatives out too. But an unpreserved cream is a risk to the very people it claims to help, so I treat preservation as part of the core chemistry: low-water systems, chelating helpers, and preservative systems proven for the exact water activity of the product — never a leftover system imported from a rougher formula.
The same discipline applies to fragrance. A baby care project I worked on uses no added fragrance at all; the adult version of that thinking is not adding a light fragrance, it is asking whether the product needs one to feel finished. Nearly always the answer is no — the texture should finish the job the scent was pretending to do.
Testing with real users beats a clean INCI list
The best formula I have ever released for reactive skin did not come from an ingredient audit — it came from a panel of twenty people who reacted to everything in their bathroom. Watching what they felt in the first five minutes of use taught me more than any claim could, and taught me that comfort after absorption matters more than the draw of a silky application.
That is why every gentle product I develop now finishes with a wear test, not only a stability test. Stability tells you the product is safe to sell; the wear test tells you whether sensitive skin will actually come back for the second bottle.