NOW Foods Inositol 500 mg (100 Veg Capsules) – Cellular Membrane & Neurotransmitter Support
NOW Foods Inositol 500 mg provides pure Myo-Inositol (chemical formula: C6H12O6), a specialized nutrient that serves as a vital structural building block for every cell membrane in your body. Often grouped with the B-vitamin family, inositol operates inside cells like a microscopic communication wire, helping cells receive chemical instructions from hormones and brain neurotransmitters. Each single vegetable capsule delivers 500 mg of pure, bioavailable myo-inositol to support normal cellular signaling, balanced mood pathways, and healthy glucose metabolism.
Quick Specs Snapshot
✓Active Form & Potency: Delivers 500 mg of pure, verified Myo-Inositol (C6H12O6) per single vegetable capsule.
✓Primary Cellular Target: Builds protective cell membrane phospholipids and powers intracellular second messenger pathways for brain and endocrine signaling.
✓Supply & Value Math: 100 full-potency capsules provide an economical 3-plus month daily supply (100 days at 1 capsule per day), costing just pennies per serving.
✓Formulation Purity: 100% vegetarian and vegan, non-GMO, packaged in a 100% post-consumer recycled (PCR) resin bottle, and made without gluten, soy, dairy, or nuts.
Right-Fit Buyer's Guide & Form Comparison
Why the Form Matters
Not all inositol supplements provide the same biological benefits. In nature, inositol exists in nine different geometric arrangements, but your body primarily relies on Myo-Inositol, which represents over 90% of the total inositol found in human tissue [4]. Many cheap, unbranded vitamins sold at big-box chain stores use low-grade, poorly purified raw powders that lack proper identity testing and can be contaminated with industrial residues. NOW Foods uses pure, authentic myo-inositol that matches the exact molecular shape your cells recognize, ensuring smooth digestive absorption and direct incorporation into cell membranes without irritating your stomach [1, 4].
Ideal For Shoppers Who:
✓Want to support emotional balance, a calm mind, and normal serotonin receptor sensitivity without grogginess [1, 4].
✓Seek to promote healthy cell membrane flexibility and support their body's natural response to insulin [2, 3].
✓Prefer a clean, single-ingredient formula in an easy-to-swallow vegetable capsule without added choline or artificial fillers.
Consider Another Option If:
✗You need high clinical daily doses (such as 2,000 mg to 4,000 mg daily), where an unflavored pure inositol powder is more economical than taking 4 to 8 capsules [2, 3].
✗You are specifically looking for liver fat metabolism support, where a combined Choline & Inositol formula may be preferable [5].
✗You take prescription psychiatric medications (such as lithium) and have not yet consulted your physician [1].
Risk-Free Assurance: Every purchase from VitaNet®, LLC is backed by our unconditional 100% money-back guarantee—we even cover return shipping on opened bottles so you can evaluate personal results completely risk-free.
Biochemical Mechanism & Cellular Pathways
To understand how inositol works, imagine your body's cells like tiny houses. The walls of each house are made of fats and oils that form a protective barrier called the cell membrane. For the house to function smoothly, instructions from the outside world (like hormones and neurotransmitters) must get inside. Inositol acts like the internal telephone system that delivers those messages [1, 4].
Once absorbed into your bloodstream, inositol supports your body through four essential biological steps:
✓Building Flexible Cell Membranes: Inositol binds with fatty acids to form phosphatidylinositol, a core component of the outer cell membrane [4, 5]. This keeps cell walls fluid, soft, and flexible so nutrients can enter and cellular waste can exit easily.
✓The "Second Messenger" Relay System: When an outside signal (the "first messenger"), such as a hormone, docks onto the cell surface, membrane enzymes split inositol compounds into two smaller messengers: inositol trisphosphate (IP3) and diacylglycerol (DAG) [1]. IP3 travels deeper into the cell to release microscopic calcium (chemical symbol: Ca2+) ions, switching on internal cellular machinery so the cell can respond immediately [1, 4].
✓Supporting Insulin Receptor Signaling: In muscle and fat cells, inositol-derived messengers help translate insulin signals [2, 3]. This activation encourages glucose transporter proteins (GLUT4) to move to the cell surface, helping cells absorb sugar from the blood to use for clean energy [2, 3].
✓Tuning Brain Neurotransmitter Pathways: Your brain contains the highest concentration of inositol in your entire body. Inositol maintains healthy receptor sensitivity for key neurotransmitters like serotonin and dopamine, helping your nervous system maintain emotional balance and resilience during everyday stress [1, 4].
Dosing, Timing & Synergy Protocol
Optimal Timing & Meal Pairing
Take 1 capsule daily with an 8-ounce glass of water (chemical formula: H2O). Because inositol is a water-soluble polyol, your body absorbs it easily across the intestinal lining via specialized sodium-dependent transporters (SMIT1 and SMIT2) [4]. While it can be taken on an empty stomach, pairing your capsule with a light meal or snack ensures smooth digestion and prevents minor stomach sensitivity [4].
Circadian & Split-Dosing Strategy
A single 500 mg capsule taken in the morning supports steady daytime focus, mental clarity, and metabolic function. If you and your healthcare professional decide to take two capsules daily for calming support, take one in the morning with breakfast and one in the evening with dinner. Inositol has a biological half-life of several hours, and an evening serving helps support natural neurotransmitter balance to encourage relaxation before bed [1, 4].
Smart Synergies & Spacing Rules
Inositol pairs exceptionally well with B-complex vitamins, particularly choline and folate, which work alongside inositol to construct healthy cell membranes and support nerve health [5]. It also pairs smoothly with magnesium to support muscular and nervous system relaxation. To maximize absorption, avoid taking inositol at the exact same moment you consume very sugary sodas or candy; glucose uses the same intestinal transport gates and can temporarily reduce inositol uptake [3].
Timeline of Expectations
✓Week 1: Initial intestinal uptake begins. Your cells absorb active myo-inositol to replenish cellular pools with complete digestive comfort and zero drowsiness [4].
✓Months 2–3+: Cumulative cellular maintenance. Nerve cell membranes, neurotransmitter receptors, and metabolic pathways maintain full nutritional support [2, 3].
Physical, Sensory & Clean Excipient Profile
Delivery Format & Swallowability
NOW Foods Inositol 500 mg is encapsulated in a standard two-piece vegetarian capsule (Hypromellose). The capsule has a smooth plant-cellulose exterior that glides down the throat effortlessly when swallowed with a glass of water, making it comfortable even for people who dislike taking pills.
Natural Aroma, Taste & Color Notes
When swallowed whole, the capsule is completely odorless and tasteless. Inside, the powder has a clean, pure white appearance. If you choose to pull the capsule apart, the pure myo-inositol powder has a pleasant, mild natural sweetness (about half as sweet as table sugar) with no chemical odor or bitter aftertaste. Natural color variation may occur from batch to batch because NOW Foods never adds synthetic colors or chemical dyes.
Other Ingredients Demystified
Every non-active ingredient in this formula serves a functional, safe manufacturing role:
✓Rice Flour: A natural, hypoallergenic grain powder used to evenly fill empty space in the capsule so each pill delivers the exact 500 mg dose.
✓Hypromellose (cellulose capsule): A 100% vegetarian capsule shell derived from natural pine fiber, providing a plant-based alternative to bovine gelatin.
✓Stearic Acid (vegetable source): A natural plant-derived fatty acid that lubricates encapsulation machinery so powders flow cleanly without sticking.
✓Silicon Dioxide: A pure food-grade compound made from silica (found in quartz and plants) that absorbs ambient moisture and prevents clumping.
Storage & Sustainability
This bottle is manufactured from 100% PCR (post-consumer recycled) resin, reducing plastic waste. Store the bottle tightly capped in a cool, dry pantry or cabinet after opening. Keep away from excessive stove heat, sink moisture, and direct sunlight to ensure optimal potency through the stamped expiration date.
Supplement Facts & Quality Verification
Supplement Facts
Serving Size: 1 Veg Capsule
Servings Per Container: 100
Description
Amount per Serving
% Daily Value
Inositol
500 mg
†
† Daily Value not established.
Other Ingredients: Rice Flour, Hypromellose (cellulose capsule), Stearic Acid (vegetable source) and Silicon Dioxide.
Allergen Statement: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Caution: For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Keep out of reach of children.
NOW Brand In-House Lab Testing & Strict Contaminant Constraints
Many bargain vitamins sold on discount internet sites and in big-box stores are produced by third-party contract packers who skip basic raw material testing. Independent retail investigations frequently uncover discount-brand supplements that fail potency standards or test positive for heavy metals and industrial impurities.
NOW Foods protects you by operating one of the most advanced analytical testing complexes in North America, with over 100,000 square feet of state-of-the-art laboratory space accredited under ISO/IEC 17025:2017. Their in-house scientists conduct more than 19,000 individual laboratory tests every month to guarantee purity and label honesty:
✓Parts-Per-Billion Heavy Metal Screening (ICP-MS): Using Inductively Coupled Plasma Mass Spectrometry, NOW tests every incoming raw material lot for toxic heavy metals—including lead, arsenic, cadmium, and mercury—enforcing internal purity limits that meet or exceed California Proposition 65 and USP standards.
✓Chromatographic Potency Verification (HPLC): High-Performance Liquid Chromatography verifies that every single capsule yields the full 500 mg of active inositol through its stamped expiration date.
✓Molecular Fingerprinting (FTIR): Fourier-Transform Infrared Spectroscopy confirms the exact molecular identity of incoming myo-inositol against certified scientific standards, ensuring zero synthetic dilution or adulteration.
✓Automated Microbiological Pathogen Screening: Comprehensive microbial assays verify the complete absence of harmful pathogens, including Salmonella, Escherichia coli, Staphylococcus aureus, coliforms, yeast, and molds.
Curator's Quality Note from VitaNet®, LLC
Founded in 1995 as an independent, family-owned business in Hartville, Ohio, VitaNet®, LLC brings over 31 years of direct nutritional science curation and retailer trust. We source fresh inventory directly from certified cGMP manufacturers like NOW Foods and store all products in our climate-regulated fulfillment warehouse. Our knowledgeable team provides direct telephone support at (330) 877-8786, and we back every single purchase with an unconditional 100% money-back guarantee that even covers return shipping on opened bottles.
Scientific References:
Berridge, M. J. (1984). Inositol trisphosphate and diacylglycerol as second messengers. Biochemical Journal, 220(2), 345–360.
Croze, M. L., & Soulage, C. O. (2013). Potential role and therapeutic interests of myo-inositol in metabolic diseases. Biochimie, 95(10), 1811–1827.
DiNicolantonio, J. J., & O'Keefe, J. H. (2022). Myo-inositol for insulin resistance, metabolic syndrome, polycystic ovary syndrome and gestational diabetes. Open Heart, 9(1), e001989.
Bizzarri, M., Fuso, A., Dinicola, S., Cucina, A., & Bevilacqua, A. (2016). Pharmacodynamics and pharmacokinetics of inositol(s) in health and disease. Expert Opinion on Drug Metabolism & Toxicology, 12(10), 1181–1196.
Holub, B. J. (1986). Metabolism and function of myo-inositol and inositol phospholipids. Annual Review of Nutrition, 6, 563–597.
*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.
Frequently Asked Questions
Can I open the vegetarian capsule and mix the powder into a drink or food?
Yes, you can easily pull the two-piece vegetable capsule apart and stir the powder directly into water, juice, applesauce, or a smoothie. Pure myo-inositol is 100% water-soluble and naturally dissolves smoothly with a gentle stir. It has a pleasant, mild natural sweetness with no bitter chemical aftertaste.
How does standalone Inositol 500 mg differ from Choline & Inositol combinations?
NOW Inositol 500 mg delivers a full 500 mg of pure myo-inositol per capsule, specifically targeted for cell membrane architecture, brain neurotransmitter sensitivity, and intracellular communication. Combination formulas (such as Choline & Inositol 250 mg / 250 mg) split the capsule volume to emphasize liver fat metabolism and bile export. If your primary goal is brain signaling, mood balance, or insulin receptor support, standalone inositol gives you twice the active inositol per pill.
Will taking NOW Inositol 500 mg break an intermittent fast?
A single capsule contains virtually zero calories, zero grams of protein, and zero fat, meaning it will not break a fasting state or trigger an insulin spike. However, if you have a sensitive stomach, taking your capsule with your first meal when opening your eating window is recommended for the best digestive comfort.
How is Inositol different from regular table sugar?
Even though inositol is chemically classified as a carbocyclic polyol (a sugar alcohol) and has a mild sweet taste, it does not act like table sugar (sucrose) or high-fructose corn syrup. It does not cause tooth decay, nor does it spike your blood sugar. Instead of being burned as quick sugary fuel, inositol is incorporated into the fatty membrane walls of your cells and used to create cellular communication signals.
How does NOW Foods test for heavy metals and purity compared to big box store brands?
Unlike big-box retail brands that often rely on contract packers without verified testing, NOW Foods conducts comprehensive testing inside its own ISO/IEC 17025 accredited analytical laboratories. Using Inductively Coupled Plasma Mass Spectrometry (ICP-MS), NOW tests raw materials and finished capsules for toxic heavy metals (lead, arsenic, cadmium, and mercury) down to parts per billion (ppb), adhering to standards that meet or exceed California Proposition 65 and USP safety limits. Every batch is also tested via HPLC for exact 500 mg potency and screened for microbial contamination.
