A reader forwarded me this link,
A Randomized Controlled Trial of the Efficacy of Systemic Enzymes and Probiotics in the Resolution of Post-COVID Fatigue
The study concludes:
This study demonstrates that a 14 days supplementation of ImmunoSEB + ProbioSEB CSC3 resolves post-COVID-19 fatigue. The proposed supplement regimen significantly reduces the burden of both, physical and mental fatigue and is effective as an early intervention in the recovery of COVID-19 patients, many of whom continue to experience severe fatigue including muscle weakness and “brain fog” several months after initial infection.
The substances used are very familiar to readers of my CFS Remission blog. They are:
- Bacillus coagulans LBSC (DSM 17654)
- Bacillus subtilis PLSSC (ATCC SD 7280)
- Bacillus clausii 088AE (MCC 0538)
Some quick notes with citations for new readers:
- “Serratiopeptidase is a proteolytic enzyme that has been used for reducing inflammation, it has antiedemic, analgesic, fibrinolytic and caesinolytic properties.” 
- Bromelain influences blood coagulation by increasing the serum fibrinolytic ability and by inhibiting the synthesis of fibrin, a protein involved in blood clotting 
- Many strains of Bacillus are fibrinolytic
This points back to the research and demonstration done by Dave Berg at Hemex Labs . “Berg and Joseph Brewer studied coagulation in CFS patients and concluded that approximately 85% of chronic fatigue syndrome patients had hypercoagulation, “[src].
My personal experience with the Hemex approach is good and put me into remission in 2000. Objective measurements showed coagulation in some parts of the coagulation cascade with piracetam and heparin being my favorite cocktail (both taken sublingual).
The study ended at two weeks with no ongoing tracking of patients. My observations of ME/CFS people over several decades has been that short term remission is common with a slow regression back to fatigue. An excellent examples are ME/CFS in Australia doing Fecal Matter Transplants with remission within 48 hours and relapse in 4-8 weeks. Just as some bacteria (bacillus cited above) reduces coagulation, other bacteria triggers coagulation. If those triggering bacteria are not adequately suppressed then the fatigue and brain fog will return over time. Think of a leaking dike, you bring in the pumps and remove the water behind the dike, 3 weeks later the water is back — you need to fix the leak in the dike also.
A reader pointed out that the product is available on Amazon US for $40. So a cheap experiment to try! If you do try it– please add your experience as a comment on this post.