All I can really give information about is that it is referred to as Marseille soap, although it isn't true Marseille soap. Marseille soap is another term for Castile soap, which traditionally is made of 100% olive oil, as the oil part to make the soap. Many companies label their soaps as being Castile, but use other oils (in this case, coconut oil) in place of olive oil, presumably because it is cheaper.
The ingredients are okay, but you can find even more simple ingredients in Dr Bronner liquid soaps, which I think use coconut, olive, and hemp oils as their base (they also refer to their soaps as "Castile"). These are also extremely inexpensive!
ETA: Although one thing with the Dr Bronner's soaps are that they are considered by some to be a bit harsh, as they don't retain as much of the glycerin by-product in their soaps as some other companies do, so they aren't as moisturising. I did a very lengthy search for pure 100% olive oil liquid Castile soap with nothing else in it and was only able to find a couple of companies on Etsy and eBay.
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