ok then what does it do for sensitive skin?
is it soothing?
does it help the razor glide?
does it stabilize the lather?
Yes, those are good questions. I can only tell you what it does for me and why I put it into my shaving soap.
I have horribly sensitive skin. Whenever I shave my legs, I get a rash. I added it to my base when I stumbled upon a soap recipe from a supplier. (I cannot remember where.) I never thought to add something like this to base. I have only used it in powders. Anyway, I sifted the arrowroot powder into my base. This is the same base that I have always used. No more rashes of any kind happened to me. I tried without it again to see if it was a fluke and it was not. I have used the same brand of razors too. I cannot explain why it helped me. It just did. My guess is that it is soothing, the same way that it is in a powder I guess. Perhaps it is just me, but I love the feel and the fact that for whatever reason, I have no rashes on my legs. Oatmeal never worked for me or other soothing agents for that matter.
I noticed no difference in the lather or the razor glide. It is all about the apparent soothing affect that it has on my skin.