I can attest to its efficacy in treating many stress related issues Maj Kim Patterson
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Someone suggested that fir me once Maj Kim Patterson thanks.

Thank you, my friend Maj Kim Patterson for posting. As long as the nervous system is functioning properly in the area where biofeedback is conducted, I expect this could be beneficial.
For peripheral nerve damage as well as advanced issues with diabetes when nerve are no longer functioning properly I see limited utility.
Thank you my friend Lt Col Charlie Brown for mentioning me.