40:1 Inositol Supplements: Compare Labels and Daily Routines

Compare 40:1 inositol products by their actual amounts, daily instructions, added nutrients and pack duration. The ratio alone does not establish the best PCOS product.

How this shortlist was selected

These four examples have documented 40:1 labels and illustrate powder, capsules and added-nutrient combinations. This is not an exhaustive market ranking or a comparison of proven treatment effectiveness. We assess ingredient amounts, daily instructions, pack duration and additions; we have not personally tested the products.

These are manufacturer-described routines, not personal dosing advice. A matched ratio does not make daily amounts identical. Compare the same market and exact version; an Optify powder listing or Ovasitol Plus is a separate product.

What the ratio leaves out

A formula containing 2,000 mg myo-inositol and 50 mg D-chiro-inositol has a 40:1 ratio, but so does one containing 400 mg and 10 mg. The total amount, number of servings and added ingredients still need comparison.

The guideline does not identify 40:1 as a universally recommended regimen. A small ratio trial cannot establish the best retail brand or a dose for an individual.

Ovasitol: powder with two daily servings

The compared canister contains 180 servings. Each supplies 2,000 mg myo-inositol and 50 mg D-chiro-inositol; the manufacturer directs two servings daily, making a 90-day canister. Only the two inositols are listed. The manufacturer names NSF contents certification, which concerns product quality rather than fertility efficacy.

Wholesome Story: two inositols without added active nutrients

The 120-capsule pack has 30 four-capsule servings. Each serving contains 2,000 mg myo-inositol and 50 mg D-chiro-inositol. Manufacturer instructions allow one or two servings daily, so that pack lasts 15–30 days. Check which routine your clinician has agreed with you; do not assume every four-capsule bottle lasts the same time.

Fairhaven: four capsules without added active nutrients

The compared 120-capsule bottle supplies 30 daily four-capsule servings, each with 2,000 mg myo-inositol and 50 mg D-chiro-inositol. Unlike some combination products, this version does not add folate or vitamin D. Fertility-focused branding does not establish superior pregnancy outcomes.

Optify: capsules with folate and vitamin D

The compared capsule version has 120 capsules and directs four once daily with food and water. It supplies 2,000 mg myo-inositol and 50 mg D-chiro-inositol, plus folate and vitamin D. Count those nutrients alongside a prenatal or separate supplements. Powder is a separate version; do not transfer its directions to this bottle.

Quality and cost are separate checks

Look for a named certification and the actual product it covers. Compare dated one-time prices for the same market and pack. Neither certification nor a lower daily cost establishes greater clinical benefit.

What the clinical evidence can establish

The 2023 international PCOS guideline describes limited clinical benefits from inositol and insufficient evidence to recommend a particular type, dose or combination. A 40:1 label is a formulation detail, not a clinical endorsement or proof that one brand works better.

Read the international PCOS guideline.

Product labels to compare

These reviews compare published ingredients and routines. Their inclusion does not establish that a product treats the symptoms discussed above. Check the exact bottle, market and formulation before using a retailer link.

Choose the comparison that answers your question

For a powder routine without added active vitamins, compare original Ovasitol with the plain capsule options. For capsules without extra active nutrients, compare Wholesome Story and Fairhaven while accounting for their different daily instructions. Consider Optify only after reviewing whether its added nutrients fit your existing supplements.

For dated prices and cost per equivalent serving, use our main buying guide. A bottle lasting longer because its directions supply less each day is not automatically better value at an equivalent amount.

See the main inositol buying comparison.