What are the main recommendations of Dr Jack Kruse?

Dr. Jack Kruse mainly recommends Magnesium for its potential benefits on cognition and sleep quality, according to discussions in the Huberman Lab. He notes that while the impact on cognition is variable, many people report better quality sleep after taking magnesium. However, he advises caution as some individuals may experience gastrointestinal side effects, such as diarrhea, with certain forms of magnesium 1.