🟢 99/100

This product looks safe

  • Vitamin B3: 50mg is 1.4× the Tolerable Upper Intake Level (35mg)
  • 56% of ingredients have research evidence
C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Vitamin B3: 50mg is 1.4× the Tolerable Upper Intake Level (35mg)

Label Data

2 Capsule(s) Serving Size
30 Servings
Other Combinations Product Type
56% Evidence Coverage

Supplement Facts — Evidence Check

Vitamin C
250 mg (278% DV)
Calcium
100 mg (8% DV)
10 mcg (50% DV)
✅ Within RDA (0.7× RDA of 0.015 mg) 📚 604 studies (Tier A: 16, B: 251)
RDA 0.015mg This product: 0.01mg UL 0.1mg
50 mg (313% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 1.4× (UL: 35 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 50mg UL 35mg
20 mg (1176% DV)
📊 15.4× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 20mg UL 100mg
50 mg (12% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 50mg
10 mg (91% DV)
✅ Within RDA (0.9× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 10mg UL 40mg
400 mcg (1143% DV)
📊 11.4× RDA — above typical dose 📚 197 studies (Tier A: 1, B: 55)
RDA 0.035mg This product: 0.4mg
📊 Market median: 500.0mg (193 products) 📚 7 studies — no high-quality reviews
This product: 100mg
Gymnema
100 mg
📊 Market median: 450.0mg (390 products) 📚 155 studies (Tier A: 0, B: 63)
This product: 100mg
Button Mushroom Fruiting Body Extract
100 mg
📊 Market median: 200.0mg (198 products) 📚 6 studies — no high-quality reviews
This product: 50mg
📊 Market median: 450.0mg (254 products) 📚 240 studies (Tier A: 0, B: 100)
This product: 50mg
Cinnamon, Powder
50 mg
Bitter Melon Fruit Extract
50 mg
📊 Market median: 500.0mg (234 products) 📚 95 studies (Tier A: 0, B: 35)
This product: 50mg
📊 Market median: 500.0mg (497 products) 📚 132 studies (Tier A: 0, B: 40)
This product: 50mg
📊 Market median: 250.0mg (562 products) 📚 53 studies (Tier A: 0, B: 19)
This product: 50mg
📊 Market median: 500.0mg (138 products) 📚 2 studies — no high-quality reviews
This product: 50mg
📊 Market median: 167.0mg (311 products) 📚 182 studies (Tier A: 0, B: 65)
This product: 10mg
Bioperine
5 mg
250 mcg
📊 Market median: 0.5mg (6 products) 📚 1 studies (Tier A: 0, B: 1)
This product: 0.25mg UL 1.8mg

Other Ingredients

Cellulose Microcrystalline Cellulose Magnesium Stearate Silicon Dioxide

Label Claims — Verification

All Other
Structure/Function
All Other (99% of products) Structure/Function (83% of products) Nutrient (54% of products)

Target Groups

Vegetarian Adult (18 - 50 Years) Women (not pregnant or lactating) Gluten Free Dairy Free

Product Information

📋 Directions for Use

Directions: Take two (2) capsules daily or as recommended by your health care provider.

⚠️ Warnings & Precautions

Caution: Transient flushing and feeling of warmth might be associated with the ingestion of niacin-containing products.

Warning: Not intended for persons under the age of 18. Keep out of reach of children.

Do not use if pregnant or nursing. Before use, consult healthcare professional, especially if you have a pre-existing condition or take prescription medicines.

Do not use if seal is broken.

🧪 Formulation Notes

Naturally Gluten Free Non GMO Dairy Free Egg Free Soy Free Nut Free Crustacean Free BPA Free

Vegetarian

Blood sugar support formula

Additional Information

Store tightly closed at room temperature (away from heat, light, and moisture).

Doctor Z Formulated

Product Details

UPC / SKU 8 50038 47403 4
DSLD Entry Date 2025-03-25
Product Type Other Combinations
Form Capsule
Brand Zenith Labs
DSLD ID 326179
Data Updated 2026-04-11

Research Evidence

371 Research Sources
54 Avg Quality Score
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
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024
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
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021
View all evidence for Vitamin C →

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