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Effer-C

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

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 75% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

Vitamin C, calcium, magnesium, and potassium are supported by strong evidence for their roles in immune function and electrolyte balance. These ingredients contribute to bone health and neuromuscular signaling. However, the overall evidence coverage for this specific formulation is limited.

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

Label

Product Label

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

Label Data

0.5 tsp
Serving Size
96
Servings
Other Combinations
Product Type
75%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

1175 mg (1306% DV)
13.1× RDA — above typical dose (UL: 2000 mg) 250 studies (A:6, B:97)
Calcium
225 mg (17% DV)
125 mg (30% DV)
Within RDA (0.3× RDA) 316 studies (A:8, B:159)
49.5 mg (1% DV)
Market median: 4002.0mg (1 products) 21 studies (A:0, B:2)

Other Ingredients

Citric Acid Rose Hips
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Usage: As a dietary supplement, adults mix 1/2 teaspoon with water or juice daily, or as directed by your health professional. Makes an effervescent drink when mixed in liquid.

Warnings & Precautions

Warning: If you are pregnant, nursing, have any health condition or taking any medication, consult your health professional before using this product.

Keep out of the reach of children.

Use only if safety seal is intact.

Formulation Notes

Gluten-free, Non-GMO

Vitamin C with Calcium, Magnesium and Potassium

Antioxidant support

Additional Information

Store in a cool, dry place.

Scan to learn about our manufacturing excellence Packaged by weight, not volume. Settling may occur.

Metadata

Product Details

UPC / SKU3 10539 01208 6
DSLD Entry Date2020-08-23
Product TypeOther Combinations
FormPowder
BrandDouglas Laboratories
DSLD ID232254
Data Updated2026-04-11
Research

Research Evidence

849
Research Sources
56
Avg Quality
450
Meta Analysis
152
Rct
137
Systematic Review
73
Clinical Trial
11
Regulatory Source
7
Other
7
Guideline
3
Openfda Safety
2
Cochrane Review
2
Observational
A Phosphate binders for preventing and treating chronic kidney disease-mineral and bone disorder (CKD-MBD)
Meta Analysis The Cochrane database of systematic reviews 2018 PubMed DOI
A Calcium supplementation (other than for preventing or treating hypertension) for improving pregnancy and infant outcomes
Meta Analysis The Cochrane database of systematic reviews 2024 PubMed DOI
A Calcium supplementation (other than for preventing or treating hypertension) for improving pregnancy and infant outcomes
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin and mineral supplementation for maintaining cognitive function in cognitively healthy people in mid and late life
Meta Analysis The Cochrane database of systematic reviews 2018 PubMed DOI
A Calcium supplementation during pregnancy for preventing hypertensive disorders and related problems
Meta Analysis The Cochrane database of systematic reviews 2025 PubMed DOI
A Dietary calcium supplementation for preventing colorectal cancer and adenomatous polyps
Systematic Review The Cochrane database of systematic reviews 2008 PubMed DOI
A Calcium and vitamin D for increasing bone mineral density in premenopausal women
Systematic Review The Cochrane database of systematic reviews 2023 PubMed DOI
A Dietary sodium, sodium-to-potassium ratio, and risk of stroke: A systematic review and nonlinear dose-response meta-analysis
Meta Analysis Clinical nutrition (Edinburgh, Scotland) 2019 PubMed DOI
A The association between circulating magnesium and clinically relevant outcomes in patients with chronic kidney disease: A systematic review and meta-analysis
Meta Analysis Clinical nutrition (Edinburgh, Scotland) 2021 PubMed DOI
A Calcium channel blockers versus other classes of drugs for hypertension
Systematic Review The Cochrane database of systematic reviews 2021 PubMed DOI
View all evidence for Electrolytes →
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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.