Inositol
Inositol is a sugar alcohol that plays important roles in cell signaling, particularly in the brain. Huberman discusses its use for anxiety, sleep, and metabolic health—it’s one of the more interesting lesser-known supplements.
What Inositol Does
| Function | Mechanism |
|---|---|
| Cell signaling | Second messenger in many pathways |
| Serotonin sensitivity | Enhances serotonin receptor function |
| Insulin signaling | Improves insulin sensitivity |
| Mood regulation | Affects multiple neurotransmitter systems |
| Sleep | May improve sleep quality at low doses |
Inositol and Anxiety/OCD
Research shows benefit for anxiety-related conditions:
Mechanism
- Enhances serotonin receptor sensitivity
- Doesn’t increase serotonin, improves response to it
- Similar pathway to SSRIs but different mechanism
Evidence
- Studies show benefit for panic disorder
- May help with OCD symptoms
- Some evidence for generalized anxiety
- Doses in studies: 12-18g daily (high)
Inositol and Sleep
At lower doses, may help with sleep:
Protocol
- 900mg before bed
- May promote relaxation
- Works through serotonin pathways
- Less dramatic than sleep cocktail components
Some people find it helpful for rumination that prevents sleep.
Metabolic Benefits
Myo-inositol affects metabolic health:
| Condition | Evidence |
|---|---|
| PCOS | Strong evidence for hormone regulation |
| Insulin resistance | May improve sensitivity |
| Gestational diabetes | Some supportive evidence |
| Metabolic syndrome | Under investigation |
Often used in reproductive medicine for PCOS.
Dosing
| Use | Dose | Notes |
|---|---|---|
| Sleep/mild anxiety | 500-900mg | Before bed |
| Moderate anxiety | 2-6g | Often divided doses |
| OCD/panic (clinical) | 12-18g | High dose, research context |
| PCOS | 2-4g | Often combined with D-chiro-inositol |
Higher doses for anxiety/OCD require clinical guidance.
Forms
| Form | Notes |
|---|---|
| Myo-inositol | Most common, best studied |
| D-chiro-inositol | Often combined for PCOS |
| Inositol hexanicotinate | Different compound (niacin form) |
Myo-inositol is what’s typically discussed for mood/sleep.
Safety
Generally well-tolerated:
- Naturally occurring substance
- High doses may cause GI upset
- May interact with psychiatric medications
- Consult provider if on SSRIs or mood medications
Why It’s Not More Popular
Despite good evidence:
- Inexpensive, not patentable
- Less marketing
- High doses required for some effects
- Mechanism less understood than other options
Related Pages
“Inositol is one of those substances that’s been shown to be effective for anxiety and OCD in studies but isn’t widely known. It enhances serotonin receptor sensitivity rather than serotonin levels.” — Andrew Huberman