Sodium Coco-Sulfate
In plain terms
A coconut-based foaming detergent often marketed as a gentle, natural alternative to sodium lauryl sulfate. The label is the catch: it is made the same way and is roughly two-thirds sodium lauryl sulfate, so it strips and irritates skin much like SLS does.
What the evidence shows
Sodium coco sulfate is an anionic detergent made by sulfating the mix of fatty alcohols from coconut oil. It is sold as the natural or gentle stand-in for sodium lauryl sulfate, but that framing does not survive a look at what it is: the same reaction, run on a broad coconut cut instead of a single alcohol, leaves a blend that is roughly two-thirds sodium lauryl sulfate by content. On skin the difference is small. A published comparison found sodium coco sulfate slightly less directly irritating than SLS by one measure, yet stronger at pulling lipids out of the skin, which is the barrier damage that makes these detergents drying. As with SLS, the real story is irritation and barrier stripping, not a cancer or hormone concern, and gentler cleansers exist, from the amphoteric coconut surfactants to sugar-based ones. Because it acts like SLS and the coco name invites people to think otherwise, it lands where SLS does: better to avoid when a milder option is available, especially in anything left on the skin or used on children.
On the label
Listed as sodium coco sulfate, sometimes spelled sulphate, near the top of a shampoo or bar-cleanser list since it is a main detergent. The coco and natural cues do not make it milder than sodium lauryl sulfate; if your skin or scalp dries out, a sulfate-free or amphoteric cleanser is the gentler swap.