No I never added baking soda, though I have heard about it.

I always LOVE how I feel after an epsom bath soak. Once in awhile I still take one, I just put my feet on edge of tub with a little battery fan on them while I enjoy the hot tub but not often anymore. I use to take one every single night in the winter when I was cold. It helped bring my blood pressure down when it was high and it always makes me sleep better.