Shampoo is detergent. It's not soap. Real soap has few ingredients (basically lye and fat) and works well at cleaning.
If it doesn't say, "soap", it's a detergent with a ton of chemicals designed to protect the detergent, not you. Many of the preservatives and surfacants are absorbed through the skin. Especially in pits and scalp. They are a slow toxins administered over your lifetime.
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