... am concerned about using so close to the brain. Should I be concerned?
No, I have not seen a problem with contact with the back of your head and problems with the brain. I would surely be concerned with application to the face. Especially dealing with the Nose area to the forehead.
I did find an article that I think you might want to read. Here is a portion of the article.
"Voltaren Gel is the first prescription topical treatment for osteoarthritis that has been approved by the U.S. Food and Drug Administration. Voltaren Gel -- a nonsteroidal anti-inflammatory drug or NSAID -- in topical form, will mostly be used on knees and hands. Voltaren Gel delivers effective pain relief and has a favorable safety profile. The systemic absorption of Voltaren Gel (1 percent diclofenac sodium in topical gel formulation) is 94 percent less than oral diclofenac (generic for Voltaren)."
Hope this helps you in your decision to use or not to use.
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