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Longer, Stronger Hair and Nails

product on market Softgel Capsule Irwin Naturals Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 25% of ingredients have research evidence
B Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · methodology

Biotin and Vitamin C are commonly used to support the structural integrity of hair and nails. Research provides moderate evidence for biotin's role in improving nail thickness, though evidence for general hair growth is more limited. The overall evidence coverage for this specific ingredient profile is very low.

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

Label

Product Label

Label for Longer, Stronger Hair and Nails
Open Full PDF View on NIH DSLD →
Details

Label Data

2 Liquid Softgel(s)
Serving Size
60
Servings
Botanical with Nutrients
Product Type
25%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Calories
20 Calorie(s)
Total Fat
1 Gram(s) (1% DV)
Protein
1 Gram(s)
Vitamin C
200 mg (222% DV)
2600 mcg (8667% DV)
86.7× RDA — above typical dose 27 studies (A:0, B:11)
Calcium
30 mg (2% DV)
10 mg (91% DV)
Within RDA (0.9× RDA) 263 studies (A:6, B:134)
1 mg (111% DV)
1.1× RDA — within safe limits 37 studies (A:0, B:11)
5 mg (217% DV)
2.2× RDA — within safe limits 9 studies — no high-quality reviews
1058 mg
Market median: 1000.0mg (212 products) 12 studies (A:0, B:3)
Gotu Kola herb extract
180 mg
Horsetail Herb Extract
160 mg
Citrus Fruit Extract
100 mg
80 mg
Market median: 500.0mg (159 products)
Proline
80 mg
BioPerine Complex
12 mg

Other Ingredients

Gelatin Water, Purified Glycerin Beeswax Soy Lecithin Titanium Dioxide Dextrin Caramel Red Cabbage extract Maltodextrin
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Directions: (Adult) Take two (2) Liquid Soft-Gels daily with meals and a full glass (8oz) of water.

Warnings & Precautions

Usage Warnings: Do not use if safety seal is broken.

Check with your doctor before using this product if you are using medication or have any medical conditions. Do not use if you may become pregnant, are pregnant or nursing.

Do not exceed recommended daily intake.

Not intended for use by persons under 18. Keep out of reach of children.

Contains: Soy

Formulation Notes

Healthy skin, hair and nails are important not only to appearance, but are also indicators of internal health status. Taking steps to improve skin, hair and nail health can not only improve the way you look but enhance the way you feel.

Nutrients to Strengthen: Horsetail is a nutritive plant full of important minerals, and is standardized to supply 11.2 mg silica per serving. Biotin is an essential vitamin that improves the strength and luster of brittle nails. Connective Tissue Support: A special blend of vitamins and minerals provide the ingredients necessary to build and protect connective tissue. Proline and Lysine are two key elements of collagen structure. Free Radical Protection: The best way to maintain healthy skin, hair and nails is to protect them from damage. Bioflavonoids possess antioxidant qualities to protect the cells from free radicals that are created by the sun and environmental pollution.

What makes us different: Liquid Soft-Gels - The nutrients in these easy-to-swallow Liquid Soft-Gels are released fast. Other forms of delivery can contain binders and fillers that may cause stomach upset and offer no nutritional value. Advanced Liquid Soft-Gels provide an optimum delivery system.

Quality Assurance - Irwin Naturals is committed to providing the highest quality products for your health. We employ compliance testing to ensure purity and potency.

Patented BioPerine - Our special BioPerine Complex enhances the bioavailability, absorption and potency of many nutrients.

+ Promote radiant skin

Biotin Silica Vitamin C Proline Zinc Copper Flaxseed oil Gotu Kola

No preservatives added.

Additional Information

Pass Quality Tested Guaranteed

Global Responsibility - Over the years we have donated to organizations that support the environment and the health of our children.

Store in a cool, dry place.

Questions: Contact Consumer Affairs 1-800-297-3273 Weekdays 8:00 AM to 5:00 PM (PST) 100+ Highly Specialized Products: www.irwinnaturals.com Value size!

Full Disclosure Ingredient Panel

Metadata

Product Details

UPC / SKU7 10363 58134 3
DSLD Entry Date2023-07-18
Product TypeBotanical with Nutrients
FormSoftgel Capsule
DSLD ID292075
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
View all evidence for Vitamin C →
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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.