Is there any reason you are using the Epsoms in the bath rather than the mag chloride..?
I guess you're replying to me? Well, mostly because I take many forms of magnesium and because I was having a good experience with epsom before I tried magnesium oil (the liquid chloride). I'm not really trying to supplement mg solely transdermally, I just do the epsom to kind of "direct feed" my skin and muscles, etc., particularly after exercise or when I need to chill out fast before bedtime. I'll also spray the mag oil onto the old injury sites before bed for extra pain relief, and I take the mag chloride tablets every night as well. But epsom is cheap and effective in the tub even if it's not as ideal as mag chloride flakes.
I take different forms for different purposes and because supplementing solely with mag chloride would not be cost-efficient for me over the long term. The mag citrate tablets keep my digestion straight, when I'm out I have to take a lot more mag chloride to get the same effect. I mentioned the magnesium l-threonate which is magnesium bonded to l-threonic acid, enabling it to cross the blood-brain barrier more easily than other forms. It seems to have a strong beneficial action specifically on the hippocampus which appeals to me because I have PTSD, and the hippocampus is typically beaten up in people with anxiety disorders like PTSD. (weed helps that too!) My husband and I both have noticed cognitive improvement since taking it and my memory has certainly improved.
Anyway, I'm getting a LOT of magnesium from different food and supplement sources, including the mag chloride, and I'm pretty happy with it all so far.