Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules, Made with Iodine supplement bottle
Best Naturals

Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules, Made with Iodine

What We Researched
9 active ingredients analyzed · 4 inactive ingredients decoded · 1 brand certification checked · 1 retailer compared · Last updated: Mar 2026
91
Product Score Excellent
67
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin B12 (as Methylcobalamin) 1000.0 mcg 41667%
Iodine (As Potassium Iodide) 300.0 mcg 200%
Zinc (as Zinc Citrate) 20.0 mg 182%
Selenium (as Sodium Selenite) 200.0 mcg 364%
Copper (As Cupric Sulfate Pentahydrate) 400.0 mcg 44%
Manganese (As Manganese Sulfate Monohydrate) 4.0 mg 174%
Molybdenum (As Sodium Molybdate Dihydrate) 100.0 mcg 222%
Day To Day Thyroid Support Blend 800.0 mg
BioPerine® Black Pepper Extract (Piper Nigrum) (Fruit) 10.0 mg
Bioavailability Very Good

Absorption Rating

  • Vitamin B12 (as Methylcobalamin) Good
  • Iodine (As Potassium Iodide) Good
  • Zinc (as Zinc Citrate) Good
  • Selenium (as Sodium Selenite) Fair
  • Copper (As Cupric Sulfate Pentahydrate) Fair
  • Manganese (As Manganese Sulfate Monohydrate) Good
  • Molybdenum (As Sodium Molybdate Dihydrate) Good
  • Day To Day Thyroid Support Blend Fair
  • BioPerine® Black Pepper Extract (Piper Nigrum) (Fruit) Good
Other Ingredients Excellent

Fillers & Additives

  • Vegetable Cellulose (Capsule)
  • Microcrystalline Cellulose
  • Silicon Dioxide
  • Vegetable Magnesium Stearate
Efficacy Very Good

Dosage Analysis

  • Vitamin B12 (as Methylcobalamin) 1000.0 mcg Effective
  • Iodine (As Potassium Iodide) 300.0 mcg High
  • Zinc (as Zinc Citrate) 20.0 mg Effective
  • Selenium (as Sodium Selenite) 200.0 mcg Effective
  • Copper (As Cupric Sulfate Pentahydrate) 400.0 mcg Under-dosed
  • Manganese (As Manganese Sulfate Monohydrate) 4.0 mg Effective
  • Molybdenum (As Sodium Molybdate Dihydrate) 100.0 mcg Effective
  • Day To Day Thyroid Support Blend 800.0 mg High
  • BioPerine® Black Pepper Extract (Piper Nigrum) (Fruit) 10.0 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin B12 (as Methylcobalamin) 1000.0 mcg 41667%
Iodine (As Potassium Iodide) 300.0 mcg 200%
Zinc (as Zinc Citrate) 20.0 mg 182%
Selenium (as Sodium Selenite) 200.0 mcg 364%
Copper (As Cupric Sulfate Pentahydrate) 400.0 mcg 44%
Manganese (As Manganese Sulfate Monohydrate) 4.0 mg 174%
Molybdenum (As Sodium Molybdate Dihydrate) 100.0 mcg 222%
Day To Day Thyroid Support Blend 800.0 mg
BioPerine® Black Pepper Extract (Piper Nigrum) (Fruit) 10.0 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetable Cellulose (Capsule) Safe

It is used as a material for making vegetarian capsules.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Vegetable Magnesium Stearate Safe

Prevents ingredients from sticking to equipment. Derived from vegetable sources.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$30$29$28$27$26 $27.99
Target

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Best Naturals

Founded 2012 · Piscataway, New Jersey, USA · 129 products · shopbestnaturals.com

Certifications

1 certification
Consumerlab Verified Source

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source

Violation History

2 incidents
Prop 65 Lead and lead compounds2021-12-29Source
Lawsuit Falsely advertising krill oil supplements that allegedly contain no krill.2021Source
Related Supplements
Frequently Asked Questions
Is Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules a good supplement?

Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules, Made with Iodine received a product quality score of 91/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 9 active ingredients with 45 servings per container. All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Best Naturals, holds a brand trust score of 67/100 with 1 verified certifications including Consumerlab.

What are the ingredients in Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules?

Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules contains 9 active ingredients: Vitamin B12 (as Methylcobalamin) (1000.0 mcg), Iodine (As Potassium Iodide) (300.0 mcg), Zinc (as Zinc Citrate) (20.0 mg), Selenium (as Sodium Selenite) (200.0 mcg), Copper (As Cupric Sulfate Pentahydrate) (400.0 mcg), Manganese (As Manganese Sulfate Monohydrate) (4.0 mg), and 3 more. Notable high-dose ingredients include Vitamin B12 at 41667% DV, Selenium at 364% DV, Molybdenum at 222% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules safe to take?

Best Naturals Day-To-Day Thyroid Support Supplement, 90 Vegetable Capsules, Made with Iodine has been analyzed for ingredient safety across all its components. All 4 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Best Naturals a trustworthy supplement brand?

Best Naturals receives a brand trust score of 67/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2012 and headquartered in Piscataway, New Jersey, USA, the company offers 129 products in their lineup. They hold 1 verified certifications including Consumerlab. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Best Naturals has 2 historical regulatory incidents on record, which are factored into the trust score.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.