What is the recommended dosage of Lion's Mane to improve memory?

There are no special dosage recommendations for Lion's mane. More studies need to be conducted. However, from the research so far, it has been reported that dosage should range from 500mg to 3000mg (96% purity extract). If your great aunt is aged, I would advise you to play safe and start with the lowest dose possible. You can also see a doctor for professional advice.