Could it be this product, called Peptide+, described as a salmon protein product developed at Haukland hospital?
https://peptid.se/om-peptid/ . I just came across an advertisement after having read your post today. I hope I didn´t get it all wrong. Maybe we could get some help from a Norwegian to translate the most interesting parts from the homepage?
Edit: Could the following be a clue to why the product possibly could help PWME:
"I kroppen kan laxpeptiderna bland annat öppna GLUT4-porten som bidrar till att glukos omvandlas till energi i muskelcellerna (glykogenlager) istället för fett i fettcellerna."
Google translate:
"In the body, the salmon peptides can open the GLUT4 port, which helps to transform glucose into energy in the muscle cells (glycogen stock) instead of fat in the fat cells."