What is low-dose naltrexone (LDN) and should it be used for anything?

On several occasions, Members have asked me to comment on the use of “low-dose naltrexone” in mental health. With low-dose naltrexone being frequently used off-label and with all the hype surrounding it, we should probably know at least a bit about it. And, mental health clinicians do see many patients with chronic pain conditions, including…