Shampoo: Strengthening shampoos

I am noticing a real trend in advertising shampoos as “strengthening” your hair. (I’m looking at you L’Oreal and Herbal Essences). What exactly does this mean?How does a shampoo strengthen? Well, it doesn’t. (I kinda of covered this topic in my post on L’Oreal’s EverStrong shampoo…) Using the right kinds of surfactants in the right proportions…...

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