Here is the soap I bought: https://www.amazon.com/dp/B08QKRQN26/ref=cm_sw_r_awdo_GBY5B5MD9HKK1XZ4FXK3

I moisturize with vanicreme in the morning and at night so I haven't found the sulfur to be overly drying. But I believe it is drying if you're not moisturizing.

https://www.amazon.com/dp/B08QKRQN26/ref=cm_sw_r_apan_i_B4DRVPE74SND1WTYM96F
This is the soap I bought. I don't feel qualified to answer your question about using it on very dry skin; sorry! My skin isn't particularly dry, so I'm not sure on that.