Home/ Supplements/ Vitamin C/ Ultra-C

Ultra-C

product on market Capsule Douglas Laboratories Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 33% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

Vitamin C is supported by strong evidence for its role in immune function and antioxidant protection. Lemon bioflavonoids and rutin provide moderate evidence for supporting vascular health and enhancing vitamin C absorption. These ingredients are generally recognized as safe for consumption.

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

Label

Product Label

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

Label Data

1 Capsule(s)
Serving Size
90
Servings
Other Combinations
Product Type
33%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Vitamin C
300 mg (500% DV)
Market median: 500.0mg (283 products) 174 studies (A:0, B:62)
50 mg
Market median: 500.0mg (19 products)

Other Ingredients

Gelatin Cellulose Vegetable Stearate
Claims

Label Claims — Verification

Unverified All Other
Info

Product Information

Directions for Use

Suggested Usage: As a dietary supplement, adults take 1 capsule 2 times daily or as directed by physician.

Warnings & Precautions

Tamper resistant package, do not use if outer seal is missing.

KEEP OUT OF REACH OF CHILDREN.

Formulation Notes

This product contains NO yeast, wheat gluten, soy protein, milk/dairy, corn, sodium, sugar, starch, artificial coloring, preservatives or flavoring.

Additional Information

Formula #7923

For optimal storage conditions, store in a cool, dry place. (59(0)-77(0)F/15(0)-25(0)C) (35-65% relative humidity)

Vitamin C is from rose hips and other natural sources.

Metadata

Product Details

UPC / SKU3 10539 00315 2
DSLD Entry Date2012-06-01
Product TypeOther Combinations
FormCapsule
BrandDouglas Laboratories
DSLD ID9204
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 →
Compare

Similar Products

Vitamin C Ester Ascorbyl Palmitate
OL Olympian Labs · Capsule
100
Vitamin C 1000 mg
PurHEALTH · Capsule
100
Ultra C Buffered
New Sun · Capsule
100
Black Elderbarry with Liposomal Vitamin C & Zinc
SunVita Health · Capsule
100
Natural Vitamin C
Herbadiet · Capsule
100
View all Vitamin C products →
Vitamin C research Best Vitamin C All Vitamin C products More from Douglas Laboratories View on NIH DSLD →

This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.