PlainVitamins

Extra Strength Hair, Skin & Nails

by 21st Century · tablet or pill · 90 tablets

  • On the market (NIH)
  • UPC 7 40985 27847 5
  • DSLD label 326326
  • Serving 3 tablets
  • 30 servings

Extra Strength Hair, Skin & Nails by 21st Century lists 26 ingredients, 24 with an amount per serving of 3 tablets, such as 1,500 mcg of vitamin A, 60 mg of vitamin C, 25 mcg (1,000 IU) of vitamin D3 and 6.75 mg of vitamin E; 2 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on March 25, 2025.

What is in Extra Strength Hair, Skin & Nails?

Each row as the label prints it, per serving of 3 tablets. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Extra Strength Hair, Skin & Nails: Supplement Facts rows against the market (DSLD label 326326, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Aas Retinyl Palmitate1,500 mcg167%
Vitamin Cas Ascorbic Acid60 mg67%Vitamin C in Extra Strength Hair, Skin & Nails against 18,583 products60 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg60 mg

65% of 18,583 products listing vitamin C give more (median 100 mg).

Vitamin D3as Cholecalciferol1,000 IU25 mcg (1,000 IU)125%Vitamin D in Extra Strength Hair, Skin & Nails against 14,175 products25 mcg per serving; the middle half of products list 10 mcg to 25 mcg, the median 15 mcg.DV 20 mcgUL 100 mcg25 mcg

Higher than 59% of 14,175 products listing vitamin D (median 15 mcg).

Vitamin Eas DL-Alpha-Tocopheryl Acetate6.75 mg45%
Thiamineas Thiamine Hydrochloride5 mg417%Thiamin in Extra Strength Hair, Skin & Nails against 9,830 products5 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg5 mg

46% of 9,830 products listing thiamin give more (median 5 mg).

Riboflavinas Vitamin B22 mg154%Riboflavin in Extra Strength Hair, Skin & Nails against 9,824 products2 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg2 mg

60% of 9,824 products listing riboflavin give more (median 4 mg).

Niacinas Niacinamide25 mg156%Niacin in Extra Strength Hair, Skin & Nails against 12,413 products25 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg25 mg

Higher than 56% of 12,413 products listing niacin (median 20 mg).

Vitamin B6as Pyridoxine Hydrochloride5 mg295%Vitamin B6 in Extra Strength Hair, Skin & Nails against 15,277 products5 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg5 mg

51% of 15,277 products listing vitamin B6 give more (median 6 mg).

Folate334 mcg DFE83%
Folic Acid200 mcg
Vitamin B12as Cyanocobalamin8 mcg334%Vitamin B12 in Extra Strength Hair, Skin & Nails against 14,425 products8 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg8 mcg

71% of 14,425 products listing vitamin B12 give more (median 36 mcg).

Biotinas D-Biotin5,000 mcg16,667%Biotin in Extra Strength Hair, Skin & Nails against 9,447 products5,000 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg5,000 mcg

Higher than 93% of 9,447 products listing biotin (median 200 mcg).

Pantothenic Acidas D-Calcium Pantothenate15 mg300%Pantothenic Acid (Vitamin B5) in Extra Strength Hair, Skin & Nails against 10,060 products15 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg15 mg

Higher than 51% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg).

Cholineas Choline Bitartrate10 mg2%Choline in Extra Strength Hair, Skin & Nails against 4,738 products10 mg per serving; the middle half of products list 18 mg to 100 mg, the median 40 mg.DV 550 mgUL 3,500 mg10 mg

80% of 4,738 products listing choline give more (median 40 mg).

Calciumas Calcium Carbonate, Dicalcium Phosphate372 mg29%Calcium in Extra Strength Hair, Skin & Nails against 17,831 products372 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg372 mg

Higher than 82% of 17,831 products listing calcium (median 115 mg).

Phosphorusas Dicalcium Phosphate180 mg14%Phosphorus in Extra Strength Hair, Skin & Nails against 3,786 products180 mg per serving; the middle half of products list 45 mg to 200 mg, the median 90 mg.DV 1,250 mgUL 4,000 mg180 mg

Higher than 72% of 3,786 products listing phosphorus (median 90 mg).

Magnesiumas Magnesium Oxide50 mg12%Magnesium in Extra Strength Hair, Skin & Nails against 14,003 products50 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg50 mg

59% of 14,003 products listing magnesium give more (median 86 mg).

Zincas Zinc Gluconate7.5 mg68%Zinc in Extra Strength Hair, Skin & Nails against 13,186 products7.5 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg7.5 mg

63% of 13,186 products listing zinc give more (median 11 mg).

Manganeseas Manganese Gluconate2 mg87%Manganese in Extra Strength Hair, Skin & Nails against 7,016 products2 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg2 mg

38% of 7,016 products listing manganese give more (median 2 mg).

Para-Aminobenzoic Acid10 mgPABA in Extra Strength Hair, Skin & Nails against 1,610 products10 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.10 mg

72% of 1,610 products listing PABA give more (median 25 mg).

Inositol30 mgInositol in Extra Strength Hair, Skin & Nails against 4,042 products30 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.30 mg

48% of 4,042 products listing inositol give more (median 30 mg).

Citrus Bioflavonoid / Rutin Complex38 mgFlavonoid in Extra Strength Hair, Skin & Nails against 2,343 products38 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.38 mg

60% of 2,343 products listing flavonoid give more (median 50 mg).

Citrus Bioflavonoidno amount given
Rutinno amount given
Horsetail, Powder3 mgHorsetail in Extra Strength Hair, Skin & Nails against 519 products3 mg per serving; the middle half of products list 20 mg to 200 mg, the median 67 mg.3 mg

88% of 519 products listing horsetail give more (median 67 mg).

Collagenas Gelatin, Hydrolyzed50 mgCollagen in Extra Strength Hair, Skin & Nails against 1,008 products0.05 g per serving; the middle half of products list 0.1 g to 4.2 g, the median 1 g.0.05 g

80% of 1,008 products listing collagen give more (median 1 g).

Source: NIH ODS Dietary Supplement Label Database, label 326326 (entered March 25, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • Its 5,000 mcg of biotin is higher than 93% of the 9,447 biotin products that print an amount; 311 list more.
  • 88% of the 519 products that print an amount of horsetail list more than its 3 mg of horsetail (median 67 mg).

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

2 products list the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Directions: As a dietary supplement, adults take three (3) tablets daily with any meal or as directed by a healthcare provider.
Warnings
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.
Allergens and what it does not contain
No added yeast or artificial flavors.
Gluten free
Storage
Store at room temperature.

Source: label statements in DSLD label 326326.

What else is on the label?

Other ingredients: Cellulose, Croscarmellose Sodium, Maltodextrin, Stearic Acid, Silicon Dioxide, Magnesium Silicate, Magnesium Stearate, Polyethylene Glycol, Polysorbate, Polyvinyl Alcohol.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Guaranteed Quality Laboratory Tested.

How many labels does Extra Strength Hair, Skin & Nails have?

3 labels are on file under this name since August 23, 2019: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 326326 (current) Entered March 25, 2025 · on the market · 90 tablets · UPC 7 40985 27847 5
  2. Label 258442 Entered December 18, 2021 · off the market July 18, 2023 · 90 tablets · UPC 7 40985 27847 5
  3. Label 205495 Entered August 23, 2019 · off the market August 6, 2021 · 90 tablets · UPC 7 40985 27847 5

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names 21st Century HealthCare, Inc. (manufacturer), Tempe, AZ. All 21st Century products.

Where next?