Inositol
A supplement (different forms mentioned) that significantly helps increase insulin sensitivity, thereby improving PCOS symptoms and fertility outcomes.
Videos Mentioning Inositol

Erasing Fears & Traumas Based on the Modern Neuroscience of Fear
Andrew Huberman
A supplement shown to notable decrease anxiety symptoms at high doses (12-18 grams for a full month), with potency comparable to prescription antidepressants, also having some evidence for obsessive-compulsive disorder.

The Science & Treatment of Bipolar Disorder
Andrew Huberman
A compound, specifically myo-inositol, used for improving sleep and reducing anxiety, also explored for bipolar disorder and OCD.

Supplements for Longevity & Their Efficacy | Dr. Peter Attia
Andrew Huberman
Occasionally taken by Andrew Huberman (900mg) before sleep.

Female Hormone Health, PCOS, Endometriosis, Fertility & Breast Cancer | Dr. Thaïs Aliabadi
Andrew Huberman
A supplement (different forms mentioned) that significantly helps increase insulin sensitivity, thereby improving PCOS symptoms and fertility outcomes.

Dr. Matt Walker: The Science of Dreams, Nightmares & Lucid Dreaming | Huberman Lab Guest Series
Andrew Huberman
Used by Andrew Huberman to help fall back asleep after waking in the middle of the night, particularly on low-carbohydrate regimens.