A warning about Long COVID research: Any long-term trials that don't have a control group are virtually useless. When large Long COVID patient groups are studied without any treatment, the number of people reporting Long COVID symptoms declines over the course of the study.

The takeaway is that for many (but not all!) Long COVID symptoms naturally get better over time. This is a huge problem for Long COVID treatment studies that don't include a control group because there's no way to tell if the treatment made the patients better any faster than they would have normally healed.