You have to list it.
If people don't like it they won't buy your soap.
If they are not concerned by it they will buy your soap.
In the United States, you actually do not have to list it. Unless the soap makes a cosmetic claim, it is just soap and requires no ingredient listing. As a personal preference, I list all of my soap ingredients, by inci, on my packages. I know I don't have to, but I do anyhow because I want my customers to have the benefit of full disclosure of all of the ingredients.
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