It works anywhere on the body.
My son does his hands. (plays guitar).
I've done it on my knee also. (upNorth where we don't have a bathtub, I made strong epsom salts compresses, and did my swollen knee for an hour, sitting on the dock in the sun.)
There is a limit to how much will go in...as it is an osmosis thing.
You can buy a cream too --Kirkman makes it. Used mostly for children, but anyone can use it.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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