Source Naturals Systemic C™, 1000 mg, 200 Tablets supplement bottle
Source Naturals

Systemic C™, 1000 mg, 200 Tablets

What We Researched
8 active ingredients analyzed · 5 inactive ingredients decoded · 1 brand certification checked · 1 retailer compared · Last updated: Mar 2026
71
Product Score Fair
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total Carbohydrates 1 g <1%
Vitamin C (as calcium ascorbate) 1000 mg 1667%
Calcium (as calcium ascorbate and dibasic calcium phosphate) 138 mg 14%
Alpha-Lipoic Acid 70 mg *
N-Acetyl Cysteine 65 mg *
Quercetin 25 mg *
Grape Seed Extract (Proanthodyn) 20 mg *
Bioavailability Good

Absorption Rating

  • Total Carbohydrates Fair
  • Vitamin C (as calcium ascorbate) Good
  • Calcium (as calcium ascorbate and dibasic calcium phosphate) Fair
  • Alpha-Lipoic Acid Fair
  • N-Acetyl Cysteine Good
  • Quercetin Fair
  • Grape Seed Extract (Proanthodyn) Good
Other Ingredients Excellent

Fillers & Additives

  • Silicified Microcrystalline Cellulose
  • Dibasic Calcium Phosphate
  • Stearic Acid
  • Modified Cellulose Gum
  • Colloidal Silicon Dioxide
Efficacy Very Poor

Dosage Analysis

  • Vitamin C (as calcium ascorbate) 1000 mg Effective
  • Calcium (as calcium ascorbate and dibasic calcium phosphate) 138 mg Under-dosed
  • Alpha-Lipoic Acid 70 mg Under-dosed
  • N-Acetyl Cysteine 65 mg Under-dosed
  • Quercetin 25 mg Under-dosed
  • Grape Seed Extract (Proanthodyn) 20 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 5
Total Carbohydrates 1 g <1%
Vitamin C (as calcium ascorbate) 1000 mg 1667%
Calcium (as calcium ascorbate and dibasic calcium phosphate) 138 mg 14%
Alpha-Lipoic Acid 70 mg *
N-Acetyl Cysteine 65 mg *
Quercetin 25 mg *
Grape Seed Extract (Proanthodyn) 20 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Silicified Microcrystalline Cellulose Generally_safe

It is used as a filler and flow agent in supplements.

Dibasic Calcium Phosphate Generally_safe

It is used as a filler and to improve tablet hardness.

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.

$32$31$30$29$28 Mar 12 $29.89
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 Systemic C™, 1000 mg a good supplement?

Source Naturals Systemic C™, 1000 mg, 200 Tablets received a product quality score of 71/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 8 active ingredients with 200 servings per container. Of the 5 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 Systemic C™, 1000 mg?

Source Naturals Systemic C™, 1000 mg contains 8 active ingredients: Calories (5), Total Carbohydrates (1 g), Vitamin C (as calcium ascorbate) (1000 mg), Calcium (as calcium ascorbate and dibasic calcium phosphate) (138 mg), Alpha-Lipoic Acid (70 mg), N-Acetyl Cysteine (65 mg), and 2 more. Notable high-dose ingredients include Vitamin C at 1667% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

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

Source Naturals Systemic C™, 1000 mg, 200 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.