Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets supplement bottle
Source Naturals

Mega-One™ Multi-Vitamin Iron Free, 90 Tablets

What We Researched
29 active ingredients analyzed · 3 inactive ingredients decoded · 1 brand certification checked · 1 retailer compared · Last updated: Mar 2026
84
Product Score Good
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin A (as palmitate 10,000 IU & beta-carotene 2,000 IU) 12000 IU 240%
Vitamin C (from calcium, zinc & manganese ascorbates) 250 mg 417%
Calcium (as calcium ascorbate & citrate) 39 mg 4%
Vitamin D3 (as cholecalciferol) 400 IU 100%
Vitamin E (as vitamine E succinate) 100 IU 333%
Thiamin (vitamin B1) 85 mg 5,667%
Riboflavin (vitamin B2) 85 mg 5,000%
Niacinamide 85 mg 425%
Vitamin B6 (as pyridoxine HCI) 85 mg 4,250%
Folate (as folic acid) 420 mcg 105%
Vitamin B12 (as cyanocobalamin) 85 mcg 1,417%
Biotin 85 mcg 28%
Pantothenic Acid (as calcium D-pantothenate) 85 mg 850%
Iodine (as potassium iodide) 150 mcg 100%
Magnesium (as magnesium citrate & oxide) 20 mg 5%
Zinc (as zinc ascorbate) 15 mg 100%
Selenium (as amino acid chelate) 50 mcg 71%
Copper (as copper sebacate) 1 mg 50%
Manganese (as manganese ascorbate) 6 mg 300%
Chromium (as amino acid chelate) 100 mcg 83%
Molybdenum (as amino acid chelate) 100 mcg 133%
Potassium (as potassium citrate) 10 mg <2%
Choline Bitartrate 85 mg *
PABA (para-aminobenzoic acid) 85 mg *
Inositol 85 mg *
Bioflavonoid Complex 25 mg *
Rutin 21 mg *
Hesperidin 5 mg *
Boron (as amino acid chelate) 1 mg *
Bioavailability Very Good

Absorption Rating

  • Vitamin A (as palmitate 10,000 IU & beta-carotene 2,000 IU) Fair
  • Vitamin C (from calcium, zinc & manganese ascorbates) Fair
  • Calcium (as calcium ascorbate & citrate) Good
  • Vitamin D3 (as cholecalciferol) Good
  • Vitamin E (as vitamine E succinate) Good
  • Thiamin (vitamin B1) Good
  • Riboflavin (vitamin B2) Good
  • Niacinamide Good
  • Vitamin B6 (as pyridoxine HCI) Fair
  • Folate (as folic acid) Fair
  • Vitamin B12 (as cyanocobalamin) Fair
  • Biotin Good
  • Pantothenic Acid (as calcium D-pantothenate) Good
  • Iodine (as potassium iodide) Good
  • Magnesium (as magnesium citrate & oxide) Good
  • Zinc (as zinc ascorbate) Fair
  • Selenium (as amino acid chelate) Good
  • Copper (as copper sebacate) Fair
  • Manganese (as manganese ascorbate) Good
  • Chromium (as amino acid chelate) Good
  • Molybdenum (as amino acid chelate) Good
  • Potassium (as potassium citrate) Good
  • Choline Bitartrate Poor
  • PABA (para-aminobenzoic acid) Good
  • Inositol Good
  • Rutin Fair
  • Hesperidin Good
  • Boron (as amino acid chelate) Fair
Other Ingredients Excellent

Fillers & Additives

  • Stearic Acid
  • Modified Cellulose Gum
  • Colloidal Silicon Dioxide
Efficacy Fair

Dosage Analysis

  • Vitamin A (as palmitate 10,000 IU & beta-carotene 2,000 IU) 12000 IU Under-dosed
  • Vitamin C (from calcium, zinc & manganese ascorbates) 250 mg Effective
  • Calcium (as calcium ascorbate & citrate) 39 mg Under-dosed
  • Vitamin D3 (as cholecalciferol) 400 IU Under-dosed
  • Vitamin E (as vitamine E succinate) 100 IU Effective
  • Thiamin (vitamin B1) 85 mg Effective
  • Riboflavin (vitamin B2) 85 mg Effective
  • Niacinamide 85 mg High
  • Vitamin B6 (as pyridoxine HCI) 85 mg Effective
  • Folate (as folic acid) 420 mcg Effective
  • Vitamin B12 (as cyanocobalamin) 85 mcg Effective
  • Biotin 85 mcg Effective
  • Pantothenic Acid (as calcium D-pantothenate) 85 mg Effective
  • Iodine (as potassium iodide) 150 mcg Effective
  • Magnesium (as magnesium citrate & oxide) 20 mg Under-dosed
  • Zinc (as zinc ascorbate) 15 mg Effective
  • Selenium (as amino acid chelate) 50 mcg Effective
  • Copper (as copper sebacate) 1 mg Effective
  • Manganese (as manganese ascorbate) 6 mg High
  • Chromium (as amino acid chelate) 100 mcg Effective
  • Molybdenum (as amino acid chelate) 100 mcg Effective
  • Potassium (as potassium citrate) 10 mg Under-dosed
  • Choline Bitartrate 85 mg Under-dosed
  • PABA (para-aminobenzoic acid) 85 mg Under-dosed
  • Inositol 85 mg Under-dosed
  • Rutin 21 mg Under-dosed
  • Hesperidin 5 mg Under-dosed
  • Boron (as amino acid chelate) 1 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin A (as palmitate 10,000 IU & beta-carotene 2,000 IU) 12000 IU 240%
Vitamin C (from calcium, zinc & manganese ascorbates) 250 mg 417%
Calcium (as calcium ascorbate & citrate) 39 mg 4%
Vitamin D3 (as cholecalciferol) 400 IU 100%
Vitamin E (as vitamine E succinate) 100 IU 333%
Thiamin (vitamin B1) 85 mg 5,667%
Riboflavin (vitamin B2) 85 mg 5,000%
Niacinamide 85 mg 425%
Vitamin B6 (as pyridoxine HCI) 85 mg 4,250%
Folate (as folic acid) 420 mcg 105%
Vitamin B12 (as cyanocobalamin) 85 mcg 1,417%
Biotin 85 mcg 28%
Pantothenic Acid (as calcium D-pantothenate) 85 mg 850%
Iodine (as potassium iodide) 150 mcg 100%
Magnesium (as magnesium citrate & oxide) 20 mg 5%
Zinc (as zinc ascorbate) 15 mg 100%
Selenium (as amino acid chelate) 50 mcg 71%
Copper (as copper sebacate) 1 mg 50%
Manganese (as manganese ascorbate) 6 mg 300%
Chromium (as amino acid chelate) 100 mcg 83%
Molybdenum (as amino acid chelate) 100 mcg 133%
Potassium (as potassium citrate) 10 mg <2%
Choline Bitartrate 85 mg *
PABA (para-aminobenzoic acid) 85 mg *
Inositol 85 mg *
Bioflavonoid Complex 25 mg *
Rutin 21 mg *
Hesperidin 5 mg *
Boron (as amino acid chelate) 1 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Modified Cellulose Gum Generally_safe

It is used to improve the texture and stability of products.

Colloidal Silicon Dioxide Generally_safe

It prevents clumping and improves powder flow.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$23$22$21$20$19 Mar 12 $21.44
Vitacost

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

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 837 products · sourcenaturals.com/

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
Related Supplements
Frequently Asked Questions
Is Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets a good supplement?

Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets received a product quality score of 84/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 29 active ingredients with 90 servings per container. Of the 3 inactive ingredients, 1 are rated safe and 0 are flagged for review. The manufacturer, Source Naturals, holds a brand trust score of 66/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets?

Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets contains 29 active ingredients: Vitamin A (as palmitate 10,000 IU & beta-carotene 2,000 IU) (12000 IU), Vitamin C (from calcium, zinc & manganese ascorbates) (250 mg), Calcium (as calcium ascorbate & citrate) (39 mg), Vitamin D3 (as cholecalciferol) (400 IU), Vitamin E (as vitamine E succinate) (100 IU), Thiamin (vitamin B1) (85 mg), and 23 more. Notable high-dose ingredients include Vitamin A at 240% DV, Vitamin C at 417% DV, Vitamin E at 333% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets safe to take?

Source Naturals Mega-One™ Multi-Vitamin Iron Free, 90 Tablets has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 837 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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.

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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.