I've tried to find phosphate-free soaps, which is better on the skin. But it's not easy. Grandpa Soap Company has several phosphate-free products, but you pay for them.
https://www.amazon.com/Kirks-Natural-Original-Fragrance-Packaging/dp/B001ESE2FG?th=1
Ingredients
Sodium Cocoate, Water, Glycerin, Sodium Chloride, Sodium Gluconate
I get it at WalMart.