BMC Ingredients has published a paper in Applied Microbiology reporting that third-party testing of dried Rhiza mycoprotein found 60.4mg of ergothioneine and 20.3mg of spermidine per 100g. Rhiza is made from the fungus Neurospora crassa by submerged fermentation, and the measurements came from a single production lot. The author states that the results do not establish bioavailability or health benefits, and proposes a four-stage research programme to test whether the compoun