Myo-inositol
Uses it900 mg on alternate nights (as stated in the Sleep Toolkit episode)
Huberman mentions taking inositol as part of his pre-sleep routine in both his sleep and supplementation episodes.
“I happen to take magnesium threonate, theanine, and apigenin. I also take inositol.”Andrew Huberman
Source: Developing a Rational Approach to Supplementation for Health & Performance (podcast, 9 Jan 2023)