Is a higher dose always better?

No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.

What does the Value score mean?

The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.

Why is the cheapest product not #1?

Cost is only one input. The cheapest pick here is a citrate form with weaker absorption and a stock-risk flag, so it leads on Value-for-cost but trails on the composite that also weighs evidence, dose fit and availability.

Are these affiliate links?

Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.

Is this medical advice?

No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.

Improve menstrual regularity

What this outcome means

Menstrual regularity is how predictable your cycle is from month to month, including how consistently periods arrive and how steady their timing feels. On DoseRank it maps to a defined health outcome built from human studies on cycle length variability, days between periods, and ovulatory consistency – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Unpredictable cyclesPeriods that arrive early, late, or skip months with no clear pattern.

Cycle trackersPeople charting their cycles who want steadier, more forecastable timing.

Perimenopausal shiftsMid-life changes that throw a once-steady cycle off its rhythm.

Stack buildersAlready taking supplements such as Myo-Inositol or D-Chiro-Inositol and want the dose right.

Evidence level

92Strong

Myo-Inositol and D-Chiro-Inositol – have strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 67 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best ingredients

Myo-Inositol and D-Chiro-Inositol are the best supported ingredient signals for this outcome.

Dose partly matchedDoseFit 67

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Myo-Inositol 2000 mg vs 2000-4000 mg, D-Chiro-Inositol 50 mg vs 50-1200 mg.

Processed

1.2k

Available

1.2k

Ingredients

Brands

188

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

Not sure which is right for you?

Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.

Take 60-sec quiz

Get a personal report

A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.

Questions

Frequently asked

Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Improve menstrual regularity

What this outcome means

Who it's for

Unpredictable cyclesPeriods that arrive early, late, or skip months with no clear pattern.

Cycle trackersPeople charting their cycles who want steadier, more forecastable timing.

Perimenopausal shiftsMid-life changes that throw a once-steady cycle off its rhythm.

Stack buildersAlready taking supplements such as Myo-Inositol or D-Chiro-Inositol and want the dose right.

Evidence level

92Strong

Best ingredients

Myo-Inositol and D-Chiro-Inositol are the best supported ingredient signals for this outcome.

Dose partly matchedDoseFit 67

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Myo-Inositol 2000 mg vs 2000-4000 mg, D-Chiro-Inositol 50 mg vs 50-1200 mg.

Processed

1.2k

Available

1.2k

Ingredients

Brands

188

Coverage

100%

Relevant ingredients

Which ingredient types matter for menstrual regularityOpen to see which ingredient types matter for menstrual regularity

1.1k products across 3 ingredient types — open to filter the ranking.

Use types to filter ranked products

Botanicals/Herbal Extracts

158 products

Concentrated plant and herbal extracts standardized to actives. Potency depends on the extract ratio and marker content, not raw weight.

Typical:

Antioxidants & Bioactive Compounds

125 products

Molecules that neutralize free radicals and tune cell signaling. Helpful in balance; mega-doses can blunt the body's own adaptive defenses.

Typical:

Sweeteners & Functional Sugars

859 products

Sugars and sugar-like compounds that sweeten or feed gut microbes. Ranges from table sugar to functional prebiotic sugars with little blood-sugar impact.

Typical: ,

Top decision cards

Best products for menstrual regularity

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for menstrual regularity

Micro Ingredients, Myo & D-Chiro Inositol Powder, 1 lb (454 g)

Micro Ingredients$0.14 / serving4.9 · 221Available now

Also helps with

PCOS symptom burden

Fasting insulin

Pregnancy rate

Why this ranks here

Evidence fitMyo-Inositol and D-Chiro-Inositol are the strongest evidence signals for this outcome.
Dose fit2 of 2 dosed ingredients land in the studied range. Myo-Inositol at 2000 mg lands inside the studied 2000-4000 mg window.
Price / serving$0.14 per serving — low price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustMixed trust signals — ratings are positive but the base is limited.

The numbers

2000 mgIn rangeinside the studied 2000-4000 mg window

50 mgIn rangeinside the studied 50-1200 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Nutricost, Women, Myo & D-Chiro Inositol, 120 Capsules

NutricostClinical97Dose fit67Popularity100$0.48/ serving

Natural Factors, Womensense®, OvaSense™, 4.55 oz (129 g)

Natural FactorsClinical97Dose fit67Popularity84$0.43/ serving

Micro Ingredients, Myo & D-Chiro Inositol, 240 Vegetarian Capsules

Micro IngredientsClinical97Dose fit67Popularity91$0.40/ serving

Fairhaven Health, Myo + D-Chiro Inositol, 240 Capsules

Fairhaven HealthClinical97Dose fit67Popularity96$0.67/ serving

SMNutrition, Myo & D-Chiro Inositol , 240 Capsules

SMNutritionClinical97Dose fit67Popularity91$0.49/ serving

Theralogix, Ovasitol®, Inositol Powder Supplement , 14.12 oz (400 g)

TheralogixClinical97Dose fit67Popularity91$0.46/ serving

Wholesome Story, Myo & D-Chiro Inositol, 360 Vegetarian Capsules

Wholesome StoryClinical97Dose fit67Popularity91$0.70/ serving

Theralogix, Ovasitol, 180 Packets, 2.22 g Each

TheralogixClinical97Dose fit67Popularity84$0.54/ serving

Wellah, Myo + D-Chiro Inositol, 120 Capsules

WellahClinical97Dose fit67Popularity89$0.33/ serving