PlainVitamins

Kelp

by GNC SuperFoods · tablet or pill · 180 vegetarian tablets

  • On the market (NIH)
  • UPC 0 48107 22528 5
  • DSLD label 309387
  • Serving 1 tablet
  • 180 servings

Kelp by GNC SuperFoods lists 3 ingredients, 3 with an amount per serving of 1 tablet, such as 80 mg of calcium, 225 mcg of iodine and 33.75 mg of kelp thallus extract. Its current label entered the NIH Dietary Supplement Label Database on June 20, 2024.

What is in Kelp?

Each row as the label prints it, per serving of 1 tablet. 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).

Kelp: Supplement Facts rows against the market (DSLD label 309387, January 2026 release)
IngredientAmount% DVAmong products listing it
Calciumas Tricalcium Phosphate80 mg6%Calcium in Kelp against 17,831 products80 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg80 mg

62% of 17,831 products listing calcium give more (median 115 mg).

Iodineas Kelp225 mcg150%Iodine in Kelp against 6,382 products225 mcg per serving; the middle half of products list 75 mcg to 150 mcg, the median 150 mcg.DV 150 mcgUL 1,100 mcg225 mcg

Higher than 90% of 6,382 products listing iodine (median 150 mcg).

Kelp Thallus Extractas Laminaria japonica Thallus Extract33.75 mgKelp in Kelp against 333 products33.75 mg per serving; the middle half of products list 20 mg to 100 mg, the median 50 mg.33.75 mg

68% of 333 products listing kelp give more (median 50 mg).

Source: NIH ODS Dietary Supplement Label Database, label 309387 (entered June 20, 2024), 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?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.

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?

The products whose ingredient lists overlap most with Kelp's, rare ingredients counting for more.

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, take one tablet daily.
Warnings
Keep out of reach of children.
Warnings: Consult your physician prior to using this product if you are pregnant, nursing, taking medication, or have a medical condition.
Discontinue use two weeks prior to surgery.
Allergens and what it does not contain
No artificial colors, no artificial flavors, gluten free, no milk.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 309387.

What else is on the label?

Other ingredients: Tricalcium Phosphate, Guar Gum, Croscarmellose Sodium, Calcium Silicate, Magnesium Stearate, Silicon Dioxide, Stearic Acid.

How many labels does Kelp have?

3 labels are on file under this name since October 22, 2016: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 309387 (current) Entered June 20, 2024 · on the market · 180 vegetarian tablets · UPC 0 48107 22528 5
  2. Label 74589 Entered May 24, 2017 · on the market · 200 vegetarian tablets · UPC 0 48107 11612 5
  3. Label 65927 Entered October 22, 2016 · off the market May 9, 2017 · 200 vegetarian tablets · UPC 0 48107 11612 5

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

Who makes it?

The label names GNC Holdings, LLC (distributor), Pittsburgh, PA. All GNC SuperFoods products.

Where next?