4 Best Inositol Supplements of 2025 [Full Comparison]
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Inositol is a naturally occurring compound, often classified as part of the vitamin B family, that plays a key role in cell signaling, hormone regulation, and fat metabolism. Commonly used as a supplement, it’s known for supporting mental health, improving insulin sensitivity, and managing conditions like PCOS (Polycystic Ovary Syndrome).
Research in The American Journal of Psychiatry (1995) demonstrated that inositol supplementation at a dose of 12 grams per day was effective in reducing symptoms of depression and panic disorder. It is believed to work by enhancing serotonin activity in the brain, offering a potential natural option for managing mental health conditions.
This 2024 study showed that 68% of PCOS patients restored menstrual cycle regularity while taking inositol supplementation, stating “it was observed that myo-inositol led to a statistically significant improvement in the hormonal and metabolic profile of PCOS patients.”
Whether you prioritize the highest-quality supplements that are independently tested, price, or shipping and customer service, we’ve combed through various brands to create what we believe is a comprehensive list that can help you find an option that best aligns with your preferences. We’ll start the list of the best options with our own inositol product at Momentous.
1. Momentous Inositol
Key Things to Know About This Product
Third-Party Tested: Yes, NSF Certified for Sport
Money-Back Guarantee: Yes
Gluten Free: Yes
GMO Free: Yes
Vegan: Yes
Product Details:
Price: $26.95
Number of Servings: 60
Amount of inositol per serving: 900mg
Serving Size: 2 capsules
Subscription: Yes - 25% discount on first order, 10% thereafter
Free shipping: Yes (orders over $75)
Pros:
Third-party certification with NSF Certified for Sport
Strong subscription discount
High dosage per serving
Vegetarian and vegan-friendly
Cons:
Price
As someone who prioritizes both mental and physical well-being, I can confidently say that Momentous Inositol is a supplement well worth adding to your daily stack.
The purity and science-backed formulation of Momentous Inositol sets it apart from other supplements on the market. Knowing that it has the NSF Certified for Sport certification helps give huge peace of mind that what’s on the label is what you’re taking and it’s free from contaminants, heavy metals, and banned substances.
After a few weeks of consistent use, I noticed improvements in the depth and quality of my sleep and overall energy levels, especially when paired with Momentous Magnesium L-Threonate.
It’s also helped with mental clarity and emotional well-being, making it ideal for anyone looking to tackle anxiety or stress. I’ve found that my mood feels more stable, and I’ve experienced fewer brain fog moments throughout the day.
The packaging is sleek and portable, making it easy to take with you on the go, and I love that it packs 900 mg per serving.
If price is your most important factor, you might find some of the other products mentioned below a better alternative. With our standards for quality, Momentous isn't the cheapest option and can be slightly pricier than other brands, but in my opinion it is well worth it for the quality.
Overall, if you’re looking to take control of your hormonal health, improve menstrual cycle regularity, or boost mental clarity, Momentous Inositol is the supplement you’ve been searching for.
2. Jarrow Formulas Inositol
Key Things to Know About This Product
Third-Party Tested: No
Money-Back Guarantee: No
Gluten Free: Yes
GMO Free: Yes
Vegan: Yes
Product Details:
Price: $15.74
Number of Servings: 100
Amount of inositol per serving: 750mg
Serving Size: 1 capsule
Subscription: Yes - 5% discount on subscriptions (via Vitacost)
Free shipping: No
Pros:
Cost effective, low price per serving
Cons:
No third-party certifications
Low/no savings on subscriptions or shipping
If price is an important factor for you then Jarrow Formulas Inositol is a great option. With 100 servings per jar, the cost per serving comes in at 15 cents per capsule, which is highly competitive compared to other brands. That said, there are no testing certifications and little to no information about product sourcing, unlike the Momentous product.
It is gluten free, GMO free, and vegan, and customer reviews and ratings are favorable, citing price as one of the driving factors in their purchase decision.
At 750 mg of inositol per capsule it offers less than the Momentous product but more than the other two products reviewed here.
3. Now Inositol Capsules
Key Things to Know About This Product
Third-Party Tested: Yes, GMP & SSCI
Money-Back Guarantee: Yes
Gluten Free: Yes
GMO Free: Yes
Vegan: Yes
Product Details:
Price: $12.99
Number of Servings: 100
Amount of inositol per serving: 500mg
Serving Size: 1 capsule
Subscription: Yes - 10% discount
Free shipping: Yes (orders over $50)
Pros:
Competitively priced
Some third-party testing
Family-owned company
Cons:
Lower dosage per serving
Now Inositol capsules are a competitively priced option for those looking to add inositol to their daily supplement routine at a lower cost. At $12.99 for 100 capsules, this product is the most affordable of all products reviewed with price per serving at just 13 cents.
Now is a well-known, family-owned brand with a strong reputation for testing and certification. Although this particular product does not carry specific certifications from the likes of the NSF or similar organizations, Now is audited and certified by Intertek as having met the Supplement Safety & Compliance Initiative (SSCI) benchmarks. This ensures uniformity in the manufacturing of dietary supplements and demonstrates continuous improvements in Good Manufacturing Practices (GMP) standards.
With 500mg of inositol per serving, this product carries a lower dosage, which might not be favorable for some, especially women with PCOS and/or those looking to improve fertility or menstrual cycle regularity as research shows higher dosages are needed for this.
4. Pure Encapsulations Inositol Complex
Key Things to Know About This Product
Third-Party Tested: Certified Gluten Free
Money-Back Guarantee: Yes
Gluten Free: Yes
GMO Free: Yes
Vegan: Yes
Product Details:
Price: $51.60
Number of Servings: 60
Amount of inositol per serving: 700mg
Serving Size: 1 capsule
Subscription: Yes - 10% discount
Free shipping: Yes
Pros:
Contains a blend of myo-inositol and D-Chiro inositol
Certified gluten free
Cons:
Price - most expensive on test
The Pure Encapsulations Inositol Complex is the only product reviewed here to combine both myo-inositol and D-Chiro inositol in its capsule. This blend has been shown to help with regulating hormonal balance, improving insulin sensitivity, and supporting ovarian function.
With its gluten-free certification, it does have some third-party testing but not as extensive as the Momentous product. Given the hefty price tag of Pure Encapsulations Inositol, this could make it harder to justify, especially if price and cost per serving are important factors for you.
This product is the most expensive of all products in this review, with price per serving at 86 cents, which is double the price per serving of the Momentous product. That said, given the combination of myo-inositol and D-Chiro inositol, this could be a worthwhile investment for those managing PCOS symptoms or looking to improve fertility.
Emma-Kate Lidbury
Emma-Kate Lidbury is a freelance writer and editor with 20 years of experience working in the health and fitness world.
