Has anyone had a hydrolyzed keratin treatment? What is the difference between it and a regular keratin treatment, and what are the pros and cons?

I'm sort of toying with the idea, but I'm not 100% sure I want to lose my natural curls. A big reason why I don't like my hair straight is that it loses all of the volume and looks very flat, though I hear the hydrolyzed keratin retains a fuller look. I really like the idea that it is said to help the hair grow longer, as I really struggle to get mine past bra strap length, despite not really doing anything that bad to it.

For anyone who has had this done, what are the pros and cons? Does it leave hair super flat, or can you still have volume and fullness? Does it actually help hair grow by making it less fragile?

Has anyone had a hydrolyzed keratin treatment? What is the difference between it and a regular keratin treatment, and what are the pros and cons?
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