For nerve pain, ARA-290 at about 4 mg daily under the skin for at least 28 days is the usual choice, though it tends to form a gel even when pre-buffered. That makes some people picky about where they get it or they add something when mixing to adjust the pH.
My wife has ongoing pain and nerve problems that doctors have not figured out after years. She has heard everything from fibromyalgia to Parkinson's, yet tests keep coming back negative. After looking around here and checking standard medical sources I brought up BPC-157 and TB-500. She was open to it until I mentioned daily shots for the first one and several times a week for the second. Is there anything else that might give comparable help but only needs weekly shots? She has already been on GLP-1 shots for more than a year with good weight loss, but I have to give them because she hates doing injections herself.