# NOW Inositol Powder 8 oz review: myo-inositol, serving math and PCOS limits Canonical: https://supplementexplained.com/products/now-inositol-powder-8-oz/ Last modified: 2026-10-15T07:36:49+00:00 Publisher: Supplement Explained Review model: Editorial review; medical review only when explicitly documented on the canonical page. Reviewed pack GTIN12: 733739005281. [Identifier source](https://www.herbspro.com/products/inositol-5), checked 2026-10-15. This identifies the named pack, not the current formula, shipped lot or a testing result. NOW Inositol Powder 8 oz provides 730 mg of myo-inositol per 1/4 level teaspoon, with 311 servings in the 8 oz (227 g) container, according to [NOW's label](https://www.nowfoods.com/products/supplements/inositol-powder). It is a single-ingredient powder, not a 40:1 inositol blend or IP6. The small label serving is not an established PCOS treatment dose. Inositol may cause digestive upset. For PCOS or fertility concerns, [discuss its use with a healthcare professional](https://pmc.ncbi.nlm.nih.gov/articles/10477934/). If you are pregnant, do not start it without your prenatal clinician's guidance or use it to self-treat gestational diabetes. It should not replace prescribed care. [NOW Foods products and brand analysis](https://supplementexplained.com/brands/now-foods/) ![NOW Foods Inositol Powder, 8 oz (227 g), single-ingredient myo-inositol](https://supplementexplained.com/wp-content/uploads/2026/10/se-backlog-r05.webp) ## NOW Foods Inositol Powder Review the exact formula and label limits before ordering. [Check price at HerbsPro](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r05-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Finositol-5) Affiliate link: we may earn a commission if you buy. **On this page** 1. [Ingredients and package size](https://supplementexplained.com/products/now-inositol-powder-8-oz/#ingredients-and-package-size) 2. [How to measure the label serving](https://supplementexplained.com/products/now-inositol-powder-8-oz/#how-to-measure-the-label-serving) 3. [What the PCOS guideline says](https://supplementexplained.com/products/now-inositol-powder-8-oz/#what-the-pcos-guideline-says) 4. [What the price per serving means](https://supplementexplained.com/products/now-inositol-powder-8-oz/#what-the-price-per-serving-means) 5. [Independent testing and brand context](https://supplementexplained.com/products/now-inositol-powder-8-oz/#independent-testing-and-brand-context) ## Ingredients and package size The [manufacturer's ingredient list](https://www.nowfoods.com/products/supplements/inositol-powder) contains myo-inositol, with no other ingredients. This is not a B-vitamin replacement or a substitute for a [multivitamin](https://supplementexplained.com/supplements/multivitamin/). This review covers the 8 oz powder. The 2 oz, 4 oz and 1 lb packages are different sizes; the 311-serving count should not be applied to them. ## How to measure the label serving The teaspoon fraction measures volume; 730 mg measures weight. Use a 1/4-teaspoon measuring spoon and fill it level, as [the label specifies](https://www.nowfoods.com/products/supplements/inositol-powder). A rounded spoonful, an eating spoon or a scoop from another supplement is not the same measure. The container's 311 servings are label-size portions, not a defined supply for a PCOS treatment plan. Do not use amounts from research as instructions to increase the serving. ## What the PCOS guideline says The [2023 international PCOS guideline](https://pmc.ncbi.nlm.nih.gov/articles/10477934/) says inositol could be considered based on individual preferences. It notes limited harms and possible improvements in some metabolic measures, but limited clinical benefit for ovulation, excess hair growth and weight. The guideline says no specific inositol type, dose or combination can currently be recommended because the evidence is not strong enough. It considers inositol for infertility experimental. This guidance concerns inositol generally; it does not establish a fertility benefit for this exact NOW powder. ## What the price per serving means On October 15, 2026, [HerbsPro listed the 8 oz powder](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r05-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Finositol-5) for $20.09 before tax and shipping. Dividing $20.09 by 311 gives about $0.0646, or roughly 6.5 cents, per 730 mg label serving. The price can change. That calculation is not a cost per research dose or prescribed regimen. Larger amounts used in research would change how long the container lasts. A low price per label serving does not establish this powder as a cheaper, effective PCOS treatment. ## Independent testing and brand context No independent test results for a finished batch of this powder have been verified for this review. That limits what can be said about a particular batch; it does not mean the product failed testing. For broader company background, see our [NOW Foods brand review](https://supplementexplained.com/brands/now-foods/). Brand-level information does not confirm the contents of the container you buy. ## Sources - [NOW exact powder label](https://www.nowfoods.com/products/supplements/inositol-powder) - [2023 international PCOS guideline](https://pmc.ncbi.nlm.nih.gov/articles/10477934/) - [HerbsPro product listing (checked October 15, 2026)](https://www.herbspro.com/products/inositol-5) Sources and labels checked October 15, 2026. [How we review](https://supplementexplained.com/how-we-review-evidence/). General information, not personal medical advice. Our editorial assessment ## Supplement Explained Score **64**/100 8 oz (227 g), single-ingredient myo-inositol Five equally weighted criteria. This is an editorial assessment, not customer stars, a clinical ranking or a measure of medical effectiveness. **Label clarity **5/5**** The 8 oz UPC, 730 mg serving, myo-inositol identity and absence of other ingredients are explicit; other package sizes are not mixed into the serving count. **Research relevance **2/5**** PCOS guideline evidence is limited and does not establish a specific type, dose or combination, nor an infertility benefit for this retail powder. **Safety and cautions **3/5**** Measuring a small powder amount and interpreting disease-related claims require care. Pregnancy, medical conditions and gastrointestinal tolerance warrant discussion rather than self-treatment. **Testing and quality checks **2/5**** Manufacturer/GMP information does not supply an independently verified potency and contaminant result for a matched finished lot. **Value for money **4/5**** At $20.09/311, a label serving is about $0.065 with no capsule burden. This is unit-price arithmetic, not a price for an effective PCOS treatment. Based on published information, not personal use or laboratory testing by us. Missing testing documentation is not evidence of contamination. Where label versions remain unresolved, the points reflect that limitation rather than assuming a complete current formula. Reviewed 2026-10-15 · Method v2.0 · [How we assign points](https://supplementexplained.com/quality/supplement-explained-score/) **Sources behind this score** - [www.nowfoods.com](https://www.nowfoods.com/products/supplements/inositol-powder) - [pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/10477934/) - [www.herbspro.com](https://www.herbspro.com/products/inositol-5)