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Natural Flex

product on market Capsule DaVinci Laboratories Of Vermont Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 50% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · methodology

Glucosamine and chondroitin sulfate are commonly used to support joint health, though research evidence for their efficacy remains limited and mixed. Vitamin C and manganese serve as essential cofactors for connective tissue synthesis. Overall, these ingredients have a well-established safety profile for most users.

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

Label

Product Label

Label for Natural Flex
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Capsule(s)
Serving Size
120
Servings
Other Combinations
Product Type
50%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Vitamin C
20 mg (33% DV)
4 mg (200% DV)
1.7× RDA — within safe limits 9 studies — no high-quality reviews
Market median: 1000.0mg (1115 products) 24 studies (A:0, B:9)
Market median: 600.0mg (79 products) 25 studies (A:0, B:6)

Other Ingredients

Gelatin Vegetable Stearate Silicon Dioxide
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: As a dietary supplement, take 1 capsule three times daily with a meal or as directed by your health care practitioner.

Warnings & Precautions

Warning: If you are pregnant or nursing, consult your health care practitioner before taking this product.

Keep out of reach of children.

Contains: Shrimp and crab.

Formulation Notes

This product is free of citrus, corn, gluten, rice and yeast.

Contains: Shrimp and crab.

Additional Information

TRUTH We pledge total truth in labeling. Our family of products contain only the purest and most potent ingredients. Guaranteed.

Color of this product may vary due to color variations of the natural ingredients.

Store in a cool, dry place.

0200444.120 0810A

10422100 0713

Metadata

Product Details

UPC / SKU0 26664 24441 3
DSLD Entry Date2013-10-25
Product TypeOther Combinations
FormCapsule
DSLD ID23229
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.