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Natural Flex

product on market Capsule DaVinci Laboratories 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 are commonly used to support joint health, though research evidence for their efficacy remains mixed. Vitamin C and manganese serve as essential cofactors for connective tissue synthesis. Overall, clinical evidence for this specific combination is limited.

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
90
Servings
Other Combinations
Product Type
50%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Vitamin C
20 mg (22% DV)
4 mg (174% 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

Hypromellose Leucine 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 healthcare practitioner.

Warnings & Precautions

Warning: If pregnant or nursing, consult your healthcare practitioner before taking this product.

Keep out of reach of children.

Contains: Shrimp and crab.

To obtain product information or report a serious adverse event, call 1-800-325-1776.

Formulation Notes

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

A Glucosamine and Chondroitin Sulfate Supplement to Support Connective Tissue and Joint Functions

Gluten Free

Additional Information

Truth We Pledge total truth in labeling. Our family of products contains only the purest and most potent ingredients. Guaranteed.

Store in a cool, dry place.

Metadata

Product Details

UPC / SKU0 26664 24449 9
DSLD Entry Date2023-12-14
Product TypeOther Combinations
FormCapsule
DSLD ID304020
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
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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.