Is inositol useful?

Yes—myо-inositol may be useful, though the evidence described here varies by purpose and some reported benefits are personal observations rather than established treatment effects.

• 900 mg for sleep and anxiety: Huberman described using 900 mg of myo-inositol for sleep and anxiety, especially finding it easier to fall back asleep after waking during the night. 1
• Fertility: Myo-inositol has been suggested to support egg and sperm quality, potentially through improved insulin sensitivity, including in the context of fertility. 2
• OCD and high-dose tolerance: Higher doses have been studied for possible partial relief of OCD symptoms; doses around 10–18 g can cause gastric discomfort, and some participants stopped because of it. 3
• Other conditions explored: Inositol has also been explored for bipolar disorder, migraine, and ADHD. 4