Inositol

Mood, insulin & metabolic support

Often called vitamin B8

Popular for PCOS & mood

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your physician before starting any supplement.

Overview

Inositol is a carbohydrate compound that is often grouped with B vitamins (sometimes called vitamin B8), though it is not technically a vitamin. It plays important roles in cell signaling, insulin sensitivity, and neurotransmitter function. The two most common supplemental forms are myo-inositol and D-chiro-inositol.

Inositol has gained significant attention for its potential to support mood, insulin sensitivity, and symptoms of polycystic ovary syndrome (PCOS). It is naturally found in many foods, including fruits, beans, grains, and nuts, but supplemental doses are often much higher than what is obtained from diet alone.

Potential Benefits

Mood Support

May support healthy mood and emotional well-being by influencing serotonin and other neurotransmitters. Often used for mild mood concerns.

Insulin Sensitivity

May help improve insulin sensitivity and support healthy blood sugar metabolism. Particularly beneficial for those with PCOS.

PCOS Support

Multiple studies show inositol (especially myo-inositol) may help support hormonal balance, ovulation, and other symptoms in women with PCOS.

Generally Well Tolerated

Inositol is very safe with an excellent safety profile. Most people tolerate it well even at higher doses (up to 12g+ daily in studies).

Typical Dosage

Daily Dose

2–4g

Often split into 2 doses (myo-inositol form most common)

Best Taken

With or without food

Can be taken morning and evening

Pro Tips

myo-Inositol is the most researched form
Stack with Magnesium and B Vitamins
Effects on mood and insulin are usually noticed within 4–8 weeks
Very safe even at higher doses (up to 12g+ in studies)

Research Snapshot

Inositol (particularly myo-inositol) has been well-studied for PCOS, mood support, and insulin sensitivity. A 2017 meta-analysis of nine randomized controlled trials found that myo-inositol supplementation significantly reduced fasting insulin and improved insulin resistance in women with PCOS, with a modest reduction in elevated androgens. It is considered a safe and well-tolerated option for these applications.

Source: Unfer et al., Endocrine Connections (2017)

How Inositol Compares

Ingredient	Best For	Key Difference
Inositol	Mood, Insulin, PCOS	B-vitamin-like; affects cell signaling
Magnesium	Sleep, Muscle, Energy	Essential mineral; supports 300+ reactions
Berberine	Blood Sugar, Metabolic	Plant alkaloid; potent metabolic effects

Inositol is often stacked with Magnesium and B Vitamins for comprehensive mood and metabolic support.

Popular Stacks with Inositol

PCOS Stack

Inositol + Magnesium + Zinc