Source Naturals Ultimate Ascorbate C™, 1000 mg, 100 Tablets supplement bottle
Source Naturals

Ultimate Ascorbate C™, 1000 mg, 100 Tablets

What We Researched
13 active ingredients analyzed · 1 inactive ingredient decoded · 1 brand certification checked · 2 retailers compared · Last updated: Mar 2026
77
Product Score Fair
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total Carbohydrates 1 g <1%
Vitamin C (as magnesium, calcium, potassium, zinc & manganese ascorbates) 2000 mg 3,333%
Vitamin D3 (as Cholecalciferol) 90 IU 20%
Calcium (as calcium ascorbates, citrate, & carbonate) 105 mg 11%
Magnesium (as magnesium ascorbates, citrate, & oxide) 100 mg 25%
Zinc (as zinc ascorbate) 20 mg 133%
Copper (as copper sebacate) 500 mcg 25%
Manganese (as manganese ascorbate) 5 mg 250%
Potassium (as potassium ascorbate & potassium citrate) 99 mg 3%
Bioflavonoids 250 mg *
Hesperidin 30 mg *
Rutin 30 mg *
Bioavailability Very Good

Absorption Rating

  • Total Carbohydrates Fair
  • Vitamin C (as magnesium, calcium, potassium, zinc & manganese ascorbates) Fair
  • Vitamin D3 (as Cholecalciferol) Good
  • Calcium (as calcium ascorbates, citrate, & carbonate) Good
  • Magnesium (as magnesium ascorbates, citrate, & oxide) Good
  • Zinc (as zinc ascorbate) Fair
  • Copper (as copper sebacate) Fair
  • Manganese (as manganese ascorbate) Good
  • Potassium (as potassium ascorbate & potassium citrate) Good
  • Bioflavonoids Fair
  • Hesperidin Good
  • Rutin Fair
Other Ingredients Excellent

Fillers & Additives

  • Stearic acid and modified cellulose gum
Efficacy Poor

Dosage Analysis

  • Vitamin C (as magnesium, calcium, potassium, zinc & manganese ascorbates) 2000 mg Effective
  • Vitamin D3 (as Cholecalciferol) 90 IU Under-dosed
  • Calcium (as calcium ascorbates, citrate, & carbonate) 105 mg Under-dosed
  • Magnesium (as magnesium ascorbates, citrate, & oxide) 100 mg Under-dosed
  • Zinc (as zinc ascorbate) 20 mg Effective
  • Copper (as copper sebacate) 500 mcg Effective
  • Manganese (as manganese ascorbate) 5 mg Effective
  • Potassium (as potassium ascorbate & potassium citrate) 99 mg Under-dosed
  • Bioflavonoids 250 mg Under-dosed
  • Hesperidin 30 mg Under-dosed
  • Rutin 30 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 10
Total Carbohydrates 1 g <1%
Vitamin C (as magnesium, calcium, potassium, zinc & manganese ascorbates) 2000 mg 3,333%
Vitamin D3 (as Cholecalciferol) 90 IU 20%
Calcium (as calcium ascorbates, citrate, & carbonate) 105 mg 11%
Magnesium (as magnesium ascorbates, citrate, & oxide) 100 mg 25%
Zinc (as zinc ascorbate) 20 mg 133%
Copper (as copper sebacate) 500 mcg 25%
Manganese (as manganese ascorbate) 5 mg 250%
Potassium (as potassium ascorbate & potassium citrate) 99 mg 3%
Bioflavonoids 250 mg *
Hesperidin 30 mg *
Rutin 30 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$17$16$15$14$13 Mar 12 $14.63
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
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Frequently Asked Questions
Is Source Naturals Ultimate Ascorbate C™, 1000 mg a good supplement?

Source Naturals Ultimate Ascorbate C™, 1000 mg, 100 Tablets received a product quality score of 77/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 13 active ingredients with 50 servings per container. Of the 1 inactive ingredients, 0 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 Ultimate Ascorbate C™, 1000 mg?

Source Naturals Ultimate Ascorbate C™, 1000 mg contains 13 active ingredients: Calories (10), Total Carbohydrates (1 g), Vitamin C (as magnesium, calcium, potassium, zinc & manganese ascorbates) (2000 mg), Vitamin D3 (as Cholecalciferol) (90 IU), Calcium (as calcium ascorbates, citrate, & carbonate) (105 mg), Magnesium (as magnesium ascorbates, citrate, & oxide) (100 mg), and 7 more. Notable high-dose ingredients include Vitamin C at 3,333% DV, Manganese at 250% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals Ultimate Ascorbate C™, 1000 mg safe to take?

Source Naturals Ultimate Ascorbate C™, 1000 mg, 100 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.

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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.