I'm trying to find relevant information about this kind of green building materials. I ran over a few producer on the internet...but I want to know opinions from people who actually used it. ty

You'd have to explain what types of concrete you are talking about.

A good way to make concrete more "eco" is to use less of it. For example, post-tensioned concrete delivers greater performance with less material.

Hempcrete , Canobiote, Conosmose
these product are not used for structural elements.

I guess jonr is right. Why do they call it concrete when it's forbidden to use it for any structural elements?