PlainVitamins

Thyroid Plus

by Priority One Nutritional Supplements · capsule · 60 capsules

  • On the market (NIH)
  • UPC 8 15354 02139 3
  • DSLD label 277417
  • Serving 2 capsules
  • 30 servings

Thyroid Plus by Priority One Nutritional Supplements lists 10 ingredients, 10 with an amount per serving of 2 capsules, such as 30 mg of thiamine hydrochloride, 50 mg of riboflavin, 52 mg NE of niacin and 40 mg of magnesium. Its current label entered the NIH Dietary Supplement Label Database on November 22, 2022.

What is in Thyroid Plus?

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).

Thyroid Plus: Supplement Facts rows against the market (DSLD label 277417, January 2026 release)
IngredientAmount% DVAmong products listing it
Thiamine Hydrochlorideas Vitamin B130 mg2,463%Thiamin in Thyroid Plus against 9,830 products30 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg30 mg

Higher than 78% of 9,830 products listing thiamin (median 5 mg).

Riboflavinas Vitamin B250 mg3,846%Riboflavin in Thyroid Plus against 9,824 products50 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg50 mg

Higher than 86% of 9,824 products listing riboflavin (median 4 mg).

Niacinas Niacin, NiacinamideNiacin (Form: as Niacin, Niacinamide Note: 50/50)52 mg NE325%Niacin in Thyroid Plus against 12,413 products52 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg52 mg

Higher than 83% of 12,413 products listing niacin (median 20 mg). 1.5 times the adult UL a day.

Magnesiumas Magnesium Aspartate, Magnesium Oxide40 mg10%Magnesium in Thyroid Plus against 14,003 products40 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg40 mg

70% of 14,003 products listing magnesium give more (median 86 mg).

Zincas Zinc Chloride, Zinc Picolinate10 mg91%Zinc in Thyroid Plus against 13,186 products10 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg10 mg

51% of 13,186 products listing zinc give more (median 11 mg).

Manganeseas Manganese Carbonate, Manganese Citrate2 mg87%Manganese in Thyroid Plus 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).

Potassiumas Potassium Aspartate, Potassium Chloride40 mg1%Potassium in Thyroid Plus against 11,614 products40 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg40 mg

79% of 11,614 products listing potassium give more (median 99 mg).

Thyroid130 mgThyroid in Thyroid Plus against 60 products130 mg per serving; the middle half of products list 31.88 mg to 142.5 mg, the median 100 mg.130 mg

Higher than 63% of 60 products listing thyroid (median 100 mg).

L-Aspartic Acid298 mgAspartic Acid in Thyroid Plus against 377 products298 mg per serving; the middle half of products list 106 mg to 1,846 mg, the median 337 mg.298 mg

54% of 377 products listing aspartic acid give more (median 337 mg).

L-Tyrosine250 mgTyrosine in Thyroid Plus against 1,680 products250 mg per serving; the middle half of products list 150 mg to 989 mg, the median 500 mg.250 mg

64% of 1,680 products listing tyrosine give more (median 500 mg).

Source: NIH ODS Dietary Supplement Label Database, label 277417 (entered November 22, 2022), 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:

  • At 1 serving a day, the most its directions give, the label lists 52 mg of niacin, 1.5 times the adult Tolerable Upper Intake Level.

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 Plus'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
Recommendations: Take two (2) capsules daily or as directed by a physician.
Warnings
Warning: Contains niacin, may cause "niacin flush" a temporary redness and tingling of the skin. Thyroid supplementation should be monitored by a physician on an ongoing basis.
If you are pregnant or breast feeding, consult your physician before using this product. May cause a reaction with other thyroid medications.
If heart palpitations, excessive sweating, or hypertyroidism occur discontinue use. Do not exceed four (4) capsules in a 24 hour period.
Keep out of reach of children.
For professional use only.
Allergens and what it does not contain
Contains no preservatives.
Non-GMO
Storage
Keep container tightly closed, store in a cool, dry place.

Source: label statements in DSLD label 277417.

What else is on the label?

Other ingredients: Rice Flour, Silicon Dioxide, Capsule.

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

How many labels does Thyroid Plus have?

4 labels are on file under this name since September 25, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 277417 (current) Entered November 22, 2022 · on the market · 60 capsules · UPC 8 15354 02139 3
  2. Label 236924 Entered September 25, 2020 · off the market June 15, 2021 · 60 vegetarian capsules · UPC 8 15354 02141 6
  3. Label 236923 Entered September 25, 2020 · off the market March 16, 2022 · 120 capsules · UPC 8 15354 02140 9
  4. Label 236922 Entered September 25, 2020 · off the market March 16, 2022 · 60 capsules · UPC 8 15354 02139 3

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

Who makes it?

The label names Priority One Nutritional Supplements, Inc. (distributor). All Priority One Nutritional Supplements products.

Where next?