PlainVitamins

Thyroid Action

by Puritan's Pride · capsule · 75 rapid release capsules

  • On the market (NIH)
  • UPC 0 25077 00052 4
  • DSLD label 285653
  • Serving 1 capsule
  • 75 servings

Thyroid Action by Puritan's Pride lists 14 ingredients, 14 with an amount per serving of 1 capsule, such as 25 mg of thiamine, 25 mg of riboflavin, 25 mg of niacin and 25 mg of vitamin B6. Its current label entered the NIH Dietary Supplement Label Database on May 24, 2023.

What is in Thyroid Action?

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

Thyroid Action: Supplement Facts rows against the market (DSLD label 285653, January 2026 release)
IngredientAmount% DVAmong products listing it
Thiamineas Thiamine Mononitrate25 mg2,083%Thiamin in Thyroid Action against 9,830 products25 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg25 mg

Higher than 72% of 9,830 products listing thiamin (median 5 mg).

Riboflavinas Vitamin B225 mg1,923%Riboflavin in Thyroid Action against 9,824 products25 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg25 mg

Higher than 75% of 9,824 products listing riboflavin (median 4 mg).

Niacinas Niacinamide25 mg156%Niacin in Thyroid Action 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 Hydrochloride25 mg1,471%Vitamin B6 in Thyroid Action against 15,277 products25 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg25 mg

Higher than 76% of 15,277 products listing vitamin B6 (median 6 mg).

Folate41.66 mcg DFE10%
Folic Acid25 mcg
Calciumas Dicalcium Phosphate52 mg4%Calcium in Thyroid Action against 17,831 products52 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg52 mg

71% of 17,831 products listing calcium give more (median 115 mg).

Phosphorusas Dicalcium Phosphate40 mg3%Phosphorus in Thyroid Action against 3,786 products40 mg per serving; the middle half of products list 45 mg to 200 mg, the median 90 mg.DV 1,250 mgUL 4,000 mg40 mg

76% of 3,786 products listing phosphorus give more (median 90 mg).

Iodineas Potassium Iodide150 mcg100%Iodine in Thyroid Action against 6,382 products150 mcg per serving; the middle half of products list 75 mcg to 150 mcg, the median 150 mcg.DV 150 mcgUL 1,100 mcg150 mcg

15% of 6,382 products listing iodine give more (median 150 mcg).

Zincas Zinc Oxide15 mg136%Zinc in Thyroid Action against 13,186 products15 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg15 mg

Higher than 56% of 13,186 products listing zinc (median 11 mg).

Seleniumas Sodium Selenate50 mcg91%Selenium in Thyroid Action against 7,658 products50 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg50 mcg

56% of 7,658 products listing selenium give more (median 55 mcg).

L-Tyrosine150 mgTyrosine in Thyroid Action against 1,680 products150 mg per serving; the middle half of products list 150 mg to 989 mg, the median 500 mg.150 mg

74% of 1,680 products listing tyrosine give more (median 500 mg).

Flax50 mgFlax in Thyroid Action against 359 products50 mg per serving; the middle half of products list 50 mg to 1,000 mg, the median 200 mg.50 mg

75% of 359 products listing flax give more (median 200 mg).

Ashwagandha Root Extractas Withanolidesstandardized to contain 1.5% withanolides, 0.37mg25 mgAshwagandha in Thyroid Action against 1,646 products25 mg per serving; the middle half of products list 125 mg to 500 mg, the median 250 mg.25 mg

97% of 1,646 products listing ashwagandha give more (median 250 mg).

Source: NIH ODS Dietary Supplement Label Database, label 285653 (entered May 24, 2023), 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:

  • 97% of the 1,646 products that print an amount of ashwagandha list more than its 25 mg of ashwagandha (median 250 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?

The products whose ingredient lists overlap most with Thyroid Action'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: Take one (1) capsule daily, preferably on an empty stomach.
Warnings
Warning: Not intended for use by pregnant or nursing women. If you are taking any medications or have any medical or thyroid condition, consult your doctor before use.
Discontinue use and consult your doctor if any adverse reactions occur.
Not intended for use by persons under the age of 18. Keep out of reach of children.
Do not use if seal under cap is broken or missing.
Storage
Store at room temperature.

Source: label statements in DSLD label 285653.

What else is on the label?

Other ingredients: Cellulose, Silica, Magnesium Stearate.

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

How many labels does Thyroid Action have?

One label is on file, entered on May 24, 2023.

  1. Label 285653 (current) Entered May 24, 2023 · on the market · 75 rapid release capsules · UPC 0 25077 00052 4

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

Who makes it?

The label names Puritan's Pride, Inc. (distributor), Ronkonkoma, NY, U.S.A.. All Puritan's Pride products.

Where next?