PlainVitamins

Thyro-Dyne

by InterPlexus · capsule · 60 vegetarian capsules

  • Off the market since June 2025 (NIH)
  • UPC 7 66897 25863 3
  • DSLD label 306839
  • Serving 2 capsules
  • 30 servings

Thyro-Dyne by InterPlexus lists 5 ingredients, 3 with an amount per serving of 2 capsules, such as 220 mcg of iodine, 226 mg of L-tyrosine and 210 mg of L-cysteine hydrochloride; 2 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on March 22, 2024.

What is in Thyro-Dyne?

Each row as the label prints it, per serving of 2 capsules. 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).

Thyro-Dyne: Supplement Facts rows against the market (DSLD label 306839, January 2026 release)
IngredientAmount% DVAmong products listing it
Iodineas Kelp220 mcg147%Iodine in Thyro-Dyne against 6,382 products220 mcg per serving; the middle half of products list 75 mcg to 150 mcg, the median 150 mcg.DV 150 mcgUL 1,100 mcg220 mcg

Higher than 89% of 6,382 products listing iodine (median 150 mcg).

L-Tyrosine226 mgTyrosine in Thyro-Dyne against 1,680 products226 mg per serving; the middle half of products list 150 mg to 989 mg, the median 500 mg.226 mg

69% of 1,680 products listing tyrosine give more (median 500 mg).

L-Cysteine Hydrochloride210 mgCysteine in Thyro-Dyne against 516 products210 mg per serving; the middle half of products list 30 mg to 200 mg, the median 85 mg.210 mg

Higher than 79% of 516 products listing cysteine (median 85 mg).

Proprietary Plant Extract Blend900 mg
Ashwagandha Root Extractas Withania somnifera Root ExtractOrganicin the blend, no amount given
Guggul Gum Resin Extractas GuggulsteronesStandardized extract min. 2.5% gugglsteronesin the blend, no amount given

Source: NIH ODS Dietary Supplement Label Database, label 306839 (entered March 22, 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; 2 ingredients sit inside a blend, so their amounts cannot be compared.

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?

1 product lists 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
Suggested Use: Take 2 capsules once a day with a meal or as directed by your physician.
Warnings
Caution: For adults only Keep out of reach of children.
Consult physician if you are pregnant/nursing, taking medication or have a medical condition.
Allergen Information: Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, or tree nut ingredients. Produced in a GMP Facility that processes other ingredients containing these allergens.
Allergens and what it does not contain
Dairy, soy, egg & gluten free.
Allergen Information: Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, or tree nut ingredients.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 306839.

What else is on the label?

Other ingredients: Cellulose, Rice Flour, NU-Mag, Nu-Flow.

How many labels does Thyro-Dyne have?

2 labels are on file under this name since April 21, 2023: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 306839 (current) Entered March 22, 2024 · off the market June 13, 2025 · 60 vegetarian capsules · UPC 7 66897 25863 3
  2. Label 271556 Entered April 21, 2023 · off the market February 16, 2023 · 60 capsules · UPC 7 66897 25863 3

DSLD also links this label to: Thyro-Dyne (image difference, same product).

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

Who makes it?

The label names InterPlexus, Inc. (distributor), Federal Way, WA. All InterPlexus products.

Where next?