@frking LDN is low dose naltrexone. It has really helped me with my symptoms. The original drug, naltrexone, is used to prevent addicts from getting high but in low doses is helps regulate the immune system. It is helping people with long covid, chronic fatigue syndrome, arthritis, etc. It needs to be started at a low dose - some start at .5 and others start at 1.5 milligrams and increase every 30 days or so up 1.5 mg. I found my sweet spot at 5mg...some only need a much lower dose and other have gone higher. For me, it initially made me sleepy and then it gave me insomnia. I take it now first thing in the morning with no insomnia/sleepiness and it give me a burst of energy about 3-4 hours later.