🟢 80/100

This product is generally safe

  • Niacin: 400mg is 11.4× the Tolerable Upper Intake Level (35mg)
  • 100% of ingredients have research evidence
C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Niacin: 400mg is 11.4× the Tolerable Upper Intake Level (35mg)

Label Data

1 Capsule(s) Serving Size
Other Combinations Product Type
100% Evidence Coverage

Supplement Facts — Evidence Check

400 mg (2000% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 11.4× (UL: 35 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 400mg UL 35mg
100 mg
📊 Market median: 550.0mg (217 products) 📚 29 studies (Tier A: 0, B: 5)
This product: 100mg

Other Ingredients

Gelatin Stearic Acid Contains Less Than 2% of

Label Claims — Verification

All Other
Structure/Function
All Other (99% of products) Structure/Function (78% of products) Nutrient (22% of products)

Target Groups

Adult (18 - 50 Years) Gluten Free Dairy Free Sugar Free

Product Information

📋 Directions for Use

DIRECTIONS: For adults, take one (1) capsule one to two times daily, preferably with meals.

⚠️ Warnings & Precautions

NOTICE: Most people should not experience flushing when using this product. However, a few sensitive individuals may experience a temporary skin flushing (hot feeling and skin redness), burning, itching, or rash caused by an increase in blood flow near the skin. Do not take on an empty stomach. Do not take more than the recommended dose unless prescribed by your doctor.

Do not use if seal under cap is broken or missing.

Discontinue use and consult your doctor if any adverse reactions occur.

Keep out of reach of children.

WARNING: Not intended for use by pregnant or nursing women. If you are taking any medications or have any medical condition, consult your doctor before use.

🧪 Formulation Notes

Non-GMO, No Artificial Color, No Artificial Flavor, No Artificial Sweetener, No Preservatives, No Sugar, No Starch, No Milk, No Lactose, No Soy, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.

Additional Information

Supports Nervous System & Energy Production

Made In The USA with select ingredients from around the world

Prod. No. 1660 17R B1660

Over 40 years of trusted quality At Nature’s Bounty, we are committed to your health. For over 40 years we have been making trusted products, backed by science, and made with only the purest ingredients…guaranteed. So you can get the most out of life every day.

~ Niacin provides energy support by aiding in conversion of food into energy.* ~ Guaranteed Quality ~ Laboratory Tested

Niacin, also known as Vitamin B-3, is found in foods such as beef, chicken, tuna, peanuts, avocados and potatoes. Niacin as Inositol Hexanicotinate is also known as Flush Free Niacin, which means that you don't experience an uncomfortable "flush" when taking this product.** Niacin supports nervous system health and provides energy support by aiding in conversion of food into energy.* Niacin also helps maintain healthy functions of the skin.*

Store at room temperature.

Nutrition Questions or Comments? Call 1-800-433-2990 Mon. - Sat. 9 AM - 7 PM ET Join our Loyalty Program at NaturesBountyRewards.com

Product Details

UPC / SKU 0 74312 01660 8
DSLD Entry Date 2016-06-24
Product Type Other Combinations
Form Capsule
DSLD ID 60853
Data Updated 2026-04-11

Research Evidence

32 Research Sources
50 Avg Quality Score
19 Rct
7 Meta Analysis
3 Clinical Trial
2 Other
1 Systematic Review
B Greater Choline-Containing Compounds and Myo-inositol in Treatment-Resistant Versus Responsive Schizophrenia: A 1H-Magnetic Resonance Spectroscopy Meta-analysis
Meta Analysis Biological psychiatry. Cognitive neuroscience and neuroimaging 2024
B Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS Guidelines
Meta Analysis The Journal of clinical endocrinology and metabolism 2024
B Antenatal dietary supplementation with myo-inositol for preventing gestational diabetes
Meta Analysis The Cochrane database of systematic reviews 2023
B Effectiveness of inositol, metformin and their combination in women with PCOS undergoing assisted reproduction: systematic review and meta-analysis
Meta Analysis Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology 2022
B Effects of myo-inositol vs. metformin on hormonal and metabolic parameters in women with PCOS: a meta-analysis
Meta Analysis Irish journal of medical science 2023
B Inositol for subfertile women with polycystic ovary syndrome
Meta Analysis The Cochrane database of systematic reviews 2018
B Treatment of lean PCOS teenagers: a follow-up comparison between Myo-Inositol and oral contraceptives
Rct European review for medical and pharmacological sciences 2021
B The 40:1 myo-inositol/D-chiro-inositol plasma ratio is able to restore ovulation in PCOS patients: comparison with other ratios
Rct European review for medical and pharmacological sciences 2019
C Investigating the effect of combined use of selenium and Myo-inositol supplements on thyroid function and autoimmune characteristics in thyroid disorders: a systematic review and meta-analysis
Meta Analysis Expert review of endocrinology & metabolism 2024
C Myo-inositol supplementation to prevent gestational diabetes in overweight non-obese women: bioelectrical impedance analysis, metabolic aspects, obstetric and neonatal outcomes - a randomized and open-label, placebo-controlled clinical trial.
Rct International journal of food sciences and nutrition
View all evidence for Inositol →

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