According to this at least 5k to 50k daily appears to be safe: https://pubmed.ncbi.nlm.nih.gov/30611908/#:~:text=In%20summary%2C%20long%2Dterm%20supplementatio

According to this at least 5k to 50k daily appears to be safe: https://pubmed.ncbi.nlm.nih.gov/30611908/#:~:text=In%20summary%2C%20long%2Dterm%20supplementation,day%20appears%20to%20be%20safe https://pubmed.ncbi.nlm.nih.gov/30611908/#:~:text=In%20summa.... Not sure what happens if you eat 10 mushrooms though