It’s soap. Like, traditional, no frills soap. Vegetable oil reacted with potassium hydroxide. It’s a very effective way to make oils mix with water so as to rinse them off of stuff. So if you just want a substance that removes excess oil from your body, it works.
Basically no other major cosmetic company sells a product like that anymore and if you don’t trust those companies, that’s what Dr. Bronners is for. Just gotta deal with the ranting on the bottles.