Home/ Supplements/ Vitamin A/ Extra Strength Hair, Skin & Nails

Extra Strength Hair, Skin & Nails

product on market Tablet or Pill 21st Century Safety: 99/100
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

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

This formula contains vitamins A, C, D3, E, and thiamine, which support cellular protection and skin integrity. There is strong evidence for the roles of these vitamins in maintaining dermatological and systemic health. However, the overall evidence coverage for this specific ingredient profile is very limited.

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

Alerts

Safety Alerts

Folate: 334mg is 334.0× the Tolerable Upper Intake Level (1.0mg)

Label

Product Label

Label for Extra Strength Hair, Skin & Nails
Open Full PDF View on NIH DSLD →
Details

Label Data

3 Tablet(s)
Serving Size
30
Servings
Other Combinations
Product Type
65%
Evidence Coverage
Ingredients

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 608 studies (A:16, B:251)
6.75 mg (45% DV)
Within RDA (0.5× RDA) 179 studies (A:3, B:90)
5 mg (417% DV)
4.2× RDA — above typical dose 76 studies (A:0, B:33)
2 mg (154% DV)
1.5× RDA — within safe limits 13 studies (A:0, B:1)
25 mg (156% DV)
1.8× RDA — within safe limits 196 studies (A:5, B:63)
5 mg (295% DV)
3.8× RDA — above typical dose (UL: 100 mg) 114 studies (A:3, B:35)
334 mcg DFE (83% DV)
Exceeds UL by 334.0× (UL: 1.0 mg) 226 studies (A:10, B:105)
8 mcg (334% DV)
3.3× RDA — above typical dose 139 studies (A:1, B:44)
5000 mcg (16667% DV)
166.7× RDA — above typical dose 27 studies (A:0, B:11)
15 mg (300% DV)
3.0× RDA — within safe limits 2 studies — no high-quality reviews
10 mg (2% DV)
Market median: 125.0mg (294 products) 38 studies (A:1, B:7)
Calcium
372 mg (29% DV)
180 mg (14% DV)
Within RDA (0.3× RDA) 13 studies (A:0, B:3)
50 mg (12% DV)
Within RDA (0.1× RDA) 316 studies (A:8, B:159)
7.5 mg (68% DV)
Within RDA (0.7× RDA) 263 studies (A:6, B:134)
2 mg (87% DV)
Within RDA (0.9× RDA) 9 studies — no high-quality reviews
Market median: 500.0mg (9 products) 7 studies — no high-quality reviews
30 mg
Market median: 550.0mg (217 products) 29 studies (A:0, B:5)
Market median: 500.0mg (19 products)
Horsetail, Powder
3 mg
50 mg
Market median: 20.0mg (931 products) 234 studies (A:1, B:90)

Other Ingredients

Cellulose Croscarmellose Sodium Maltodextrin Stearic Acid Silicon Dioxide Magnesium Silicate Magnesium Stearate Polyethylene Glycol Polysorbate Polyvinyl Alcohol
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

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

Metadata

Product Details

UPC / SKU7 40985 27847 5
DSLD Entry Date2025-03-25
Product TypeOther Combinations
FormTablet or Pill
Brand21st Century
DSLD ID326326
Data Updated2026-04-11
Research

Research Evidence

337
Research Sources
54
Avg Quality
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
Meta Analysis The Cochrane database of systematic reviews 2017 PubMed DOI
A Vitamin A supplementation for the prevention of morbidity and mortality in infants six months of age or less
Meta Analysis The Cochrane database of systematic reviews 2011 PubMed DOI
A Vitamin A supplementation for reducing the risk of mother-to-child transmission of HIV infection
Meta Analysis The Cochrane database of systematic reviews 2011 PubMed DOI
A Vitamin A supplements for preventing mortality, illness, and blindness in children aged under 5: systematic review and meta-analysis
Meta Analysis BMJ (Clinical research ed.) 2011 PubMed DOI
A Fortification of staple foods with vitamin A for vitamin A deficiency
Systematic Review The Cochrane database of systematic reviews 2019 PubMed DOI
A Vitamin A supplementation for the prevention of morbidity and mortality in infants one to six months of age
Narrative Review The Cochrane database of systematic reviews 2016 PubMed DOI
A Vitamin A and fish oils for preventing the progression of retinitis pigmentosa
Meta Analysis The Cochrane database of systematic reviews 2020 PubMed DOI
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
Meta Analysis Journal of sport and health science 2023 PubMed DOI
A Food fortification with multiple micronutrients: impact on health outcomes in general population
Meta Analysis The Cochrane database of systematic reviews 2019 PubMed DOI
A Oral vitamin A supplements to prevent acute upper respiratory tract infections in children up to seven years of age
Meta Analysis The Cochrane database of systematic reviews 2024 PubMed DOI
View all evidence for Vitamin A →
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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.