Extra Strength Hair, Skin & Nails
99/100
This product looks safe
- Folate: 334mg is 334.0× the Tolerable Upper Intake Level (1.0mg)
- 65% of ingredients have research evidence
C
Label Compliance Grade
Product Label
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Safety Alerts
⚠️ Folate: 334mg is 334.0× the Tolerable Upper Intake Level (1.0mg)
Label Data
3 Tablet(s)
Serving Size
30
Servings
Other Combinations
Product Type
65%
Evidence Coverage
Supplement Facts — Evidence Check
Vitamin A
1500 mcg
(167% DV)
Vitamin C
60 mg
(67% DV)
25 mcg
(125% DV)
✅ 1.7× RDA — within safe limits
📚 604 studies (Tier A: 16, B: 251)
6.75 mg
(45% DV)
✅ Within RDA (0.5× RDA of 15 mg)
📚 177 studies (Tier A: 3, B: 90)
5 mg
(417% DV)
📊 4.2× RDA — above typical dose
📚 76 studies (Tier A: 0, B: 33)
2 mg
(154% DV)
✅ 1.5× RDA — within safe limits
📚 12 studies (Tier A: 0, B: 1)
25 mg
(156% DV)
✅ 1.8× RDA — within safe limits
📚 193 studies (Tier A: 5, B: 63)
5 mg
(295% DV)
📊 3.8× RDA — above typical dose (UL: 100 mg)
📚 113 studies (Tier A: 3, B: 35)
334 mcg DFE
(83% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 334.0× (UL: 1.0 mg)
📚 225 studies (Tier A: 10, B: 105)
8 mcg
(334% DV)
📊 3.3× RDA — above typical dose
📚 138 studies (Tier A: 1, B: 44)
5000 mcg
(16667% DV)
📊 166.7× RDA — above typical dose
📚 26 studies (Tier A: 0, B: 11)
15 mg
(300% DV)
✅ 3.0× RDA — within safe limits
📚 1 studies — no high-quality reviews
10 mg
(2% DV)
📊 Market median: 125.0mg (294 products)
📚 36 studies (Tier A: 1, B: 7)
Calcium
372 mg
(29% DV)
180 mg
(14% DV)
✅ Within RDA (0.3× RDA of 700 mg)
📚 12 studies (Tier A: 0, B: 3)
50 mg
(12% DV)
📊 Market median: 4002.0mg (1 products)
📚 20 studies (Tier A: 0, B: 2)
7.5 mg
(68% DV)
✅ Within RDA (0.7× RDA of 11 mg)
📚 258 studies (Tier A: 6, B: 134)
2 mg
(87% DV)
✅ Within RDA (0.9× RDA of 2.3 mg)
📚 8 studies — no high-quality reviews
10 mg
📊 Market median: 500.0mg (9 products)
30 mg
📊 Market median: 550.0mg (217 products)
📚 29 studies (Tier A: 0, B: 5)
📊 Market median: 500.0mg (19 products)
Horsetail, Powder
3 mg
50 mg
📊 Market median: 20.0mg (931 products)
📚 233 studies (Tier A: 1, B: 90)
Other Ingredients
Cellulose
Croscarmellose Sodium
Maltodextrin
Stearic Acid
Silicon Dioxide
Magnesium Silicate
Magnesium Stearate
Polyethylene Glycol
Polysorbate
Polyvinyl Alcohol
Label Claims — Verification
❓
Nutrient
❓
All Other
❓
Structure/Function
All Other (99% of products)
Structure/Function (76% of products)
Nutrient (58% of products)
Target Groups
Adult (18 - 50 Years)
Gluten Free
Product Information
📋 Directions for Use
Directions: As a dietary supplement, adults take three (3) tablets daily with any meal or as directed by a healthcare provider.
⚠️ Warnings & Precautions
Do not exceed recommended dosage.
Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.
Stop use and contact a physician if adverse reactions occur.
Keep out of reach of children.
Do not use if product appears to be tampered with or seal is broken.
🧪 Formulation Notes
No added yeast or artificial flavors.
Antioxidants A, C & E Plus B-Complex Vitamins & Minerals 5000 mcg of Biotin per serving
Gluten free
Additional Information
Individual results may vary.
Store at room temperature.
Actual size
Guaranteed Quality Laboratory Tested
Product Details
UPC / SKU
7 40985 27847 5
DSLD Entry Date
2025-03-25
Product Type
Other Combinations
Form
Tablet or Pill
Brand
21st Century
DSLD ID
326326
Data Updated
2026-04-11
Research Evidence
337
Research Sources
54
Avg Quality Score
161
Meta Analysis
68
Systematic Review
51
Rct
48
Clinical Trial
2
Other
2
Regulatory Source
1
Narrative Review
1
Cochrane Review
1
Guideline
1
Openfda Safety
A
Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age
A
Vitamin A supplementation for the prevention of morbidity and mortality in infants six months of age or less
A
Vitamin A supplementation for reducing the risk of mother-to-child transmission of HIV infection
A
Vitamin A supplements for preventing mortality, illness, and blindness in children aged under 5: systematic review and meta-analysis
A
Vitamin A supplementation for the prevention of morbidity and mortality in infants one to six months of age
A
Exercise training-induced changes in exerkine concentrations may be relevant to the metabolic control of type 2 diabetes mellitus patients: A systematic review and meta-analysis of randomized controlled trials
A
Food fortification with multiple micronutrients: impact on health outcomes in general population
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