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Systemic C

product on market Capsule Source Naturals Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 44% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · methodology

This formula combines Vitamin C and N-Acetyl Cysteine, both of which have strong evidence for supporting antioxidant defenses and cellular health. Calcium provides essential mineral support for bone and nerve function. Overall, the evidence coverage for this specific ingredient combination is limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Systemic C
Open Full PDF View on NIH DSLD →
Details

Label Data

2 Capsule(s)
Serving Size
60
Servings
Other Combinations
Product Type
44%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Calories
5 Calorie(s)
Total Carbohydrates
1 Gram(s) (1% DV)
Vitamin C
1000 mg (1667% DV)
Calcium
110 mg (11% DV)
Market median: 600.0mg (7 products) 39 studies (A:2, B:13)
Market median: 200.0mg (198 products) 6 studies — no high-quality reviews
50 mg
Market median: 500.0mg (283 products) 174 studies (A:0, B:62)
Market median: 500.0mg (283 products) 174 studies (A:0, B:62)
Market median: 100.0mg (284 products) 10 studies (A:0, B:4)

Other Ingredients

Gelatin Maltodextrin Silica Magnesium Stearate
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: 2 capsules 1 to 2 times daily.

Warnings & Precautions

Warning: Do not use if you are taking any form of prescription nitrate such as nitroglycerin. If you are pregnant, may become pregnant, breastfeeding, or taking any prescription drug, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing.

Keep out of the reach of children.

Formulation Notes

Enhanced non-acidic vitamin C For superior antioxidant protection 500 mg

The unique blend of compounds in Systemic C including alpha-lipoic acid, N-acetyl cysteine, quercetin, and grape seed extract, help to reactivate and recycle vitamin C in the body.

Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

Additional Information

The benefits of vitamin C are energized in this formula, which is designed to make more vitamin C available for immune support and free radical scavenging. After vitamin C carries out its antioxidant function of neutralizing free radicals, it is oxidized and spent.

This provides the body with increased antioxidant activity, an upgraded, robust C for healthy aging, immune health and heart health. Reactivating vitamin C allows this important vitamin to continue its vital functions.

Store in a cool, dry place.

SN2158 REV C172-A

Metadata

Product Details

UPC / SKU0 21078 02158 2
DSLD Entry Date2017-05-24
Product TypeOther Combinations
FormCapsule
DSLD ID73838
Data Updated2026-04-11
Research

Research Evidence

371
Research Sources
54
Avg Quality
148
Meta Analysis
82
Systematic Review
71
Rct
62
Clinical Trial
2
Regulatory Source
1
Cochrane Review
1
Narrative Review
1
Other
1
Openfda Safety
A Vitamin C supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017 PubMed DOI
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013 PubMed DOI
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013 PubMed DOI
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020 PubMed DOI
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021 PubMed DOI
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024 PubMed DOI
A Does Vitamin C Supplementation Provide a Protective Effect in Periodontal Health? A Systematic Review and Meta-Analysis
Meta Analysis International journal of molecular sciences 2024 PubMed DOI
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021 PubMed DOI
View all evidence for Vitamin C →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.