Thyroid 300mg | New Zealand Grass-Fed Beef Thyroid Glandular Concentrate for Thyroid & Metabolic Support | 60 or 120 Capsules

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Thyroid 300mg — High-Potency New Zealand Grass-Fed Beef Thyroid Glandular Concentrate for Thyroid & Metabolic Support

Thyroid 300mg is Priority One's highest-potency single-ingredient thyroid glandular formula — providing 300mg of pure, desiccated thyroid glandular concentrate per capsule from New Zealand grass-fed, grass-finished cattle. Available in 60 and 120 capsule sizes for flexible supply options.*

Please note: Thyroid 300mg contains bovine thyroid tissue and is encapsulated in gelatin — not suitable for vegetarians or vegans.

Serving size is 1 capsule. Available in 60 and 120 capsule sizes — select your preferred size above.


New Zealand sourcing — why it matters

All Priority One glandular products use glandular tissue sourced from New Zealand grass-fed, grass-finished cattle — the highest available quality and safety standard in the global glandular supplement market.*

New Zealand cattle are raised on pasture year-round, free from growth hormones, BSE, and the intensive farming conditions common in other producing regions. New Zealand's strict agricultural regulations, pristine environment, and stringent BSE-free status make its bovine glandular material the preferred source for quality-conscious glandular medicine practitioners worldwide. The combination of grass-fed, hormone-free, New Zealand sourcing ensures that the thyroid glandular concentrate in this formula is as clean, potent, and tissue-representative as commercially available.*


What's inside and why it matters

Thyroid Glandular Concentrate (300mg per capsule)

Desiccated (dried) thyroid glandular concentrate is the most direct form of thyroid tissue support available as a dietary supplement. Thyroid glandular provides tissue-specific factors from thyroid tissue — including naturally occurring thyroid peptides, thyroid proteins (including thyroglobulin), co-factors, and enzymatic components involved in normal thyroid hormone synthesis and cellular thyroid function.*

The thyroid gland is responsible for the synthesis and secretion of thyroxine (T4) and triiodothyronine (T3) — the primary hormones regulating metabolic rate, normal energy production, body temperature, heart rate, and virtually every organ system's metabolic activity. In glandular medicine, the principle of "like supports like" underpins the use of thyroid glandular — providing the same tissue type as the organ being supported.*

What thyroid glandular contains — Desiccated thyroid concentrate from whole thyroid tissue naturally contains thyroglobulin (the glycoprotein precursor to T4 and T3), calcitonin (a thyroid hormone involved in calcium regulation), thyroid-specific enzymes (including thyroid peroxidase), and the full complement of thyroid tissue-specific peptides and cofactors. While supplement-grade thyroid glandular is labelled as containing thyroid tissue, its hormonal content is typically low and variable — it is the tissue-specific factors, not pharmaceutical hormone replacement, that characterise its role as a dietary supplement.*

Why 300mg? At 300mg per capsule, Thyroid 300mg provides more than twice the dose of the 130mg option and more than four times the 65mg option. This is Priority One's highest-potency thyroid glandular product — appropriate for practitioners and individuals who require the highest available single-capsule glandular dose for their clinical protocols. The 300mg dose is used in functional and naturopathic medicine protocols where high-dose glandular support is indicated.*


Thyroid 300mg vs the 32.5mg / 65mg / 130mg range

Priority One offers thyroid glandular across four potency levels: 32.5mg, 65mg, 130mg, and 300mg. The 300mg product is the highest-potency option — designed for individuals whose healthcare provider has determined that a high-dose glandular protocol is appropriate. The lower potency options (32.5mg, 65mg, 130mg) allow for precise dose titration; the 300mg option serves those who have completed titration and established their maintenance or therapeutic dose.*


At a glance — what this formula supports

  • Normal thyroid function and healthy thyroid tissue support via 300mg glandular concentrate*
  • Normal energy metabolism and healthy metabolic rate support*
  • Normal body temperature regulation and healthy thermogenesis*
  • Thyroid tissue-specific factors from premium New Zealand grass-fed beef sourcing*
  • High-potency glandular dosing for intensive healthcare provider protocols*

Quality you can verify

Every batch of Thyroid 300mg is manufactured in a GMP-certified facility and third-party tested for purity and potency. Sourced exclusively from New Zealand grass-fed, grass-finished, hormone-free cattle. Gelatin capsule — not suitable for vegetarians or vegans.

Available in 60 and 120 capsule sizes.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


Warnings

WARNING: If you are pregnant or breastfeeding, consult your physician before using this product. Thyroid glandular should be used under the supervision of a qualified healthcare provider — thyroid function should be monitored with appropriate testing. Do not use as a substitute for prescribed thyroid hormone replacement therapy without healthcare provider guidance. Not suitable for vegetarians or vegans. Keep out of reach of children.

The Priority One Difference

The Priority One Difference

Our Quality Promise
  • 5 stars: 41 (93%)
  • 4 stars: 1 (2%)
  • 3 stars: 2 (5%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
J
Jerome I Kahn (Desert Hot Springs, CA, US)
Synthroid is the left-handed inactive thyroid hormone.

Desiccated thyroid has been on the market for over 150 years, and it is the ONLY source for T3 (triiodothyronine), the active thyroid hormone. Bad pharma markets the left-handed levothyroxine (LT4) since 1927; it is inadequate and still a blockbuster. Synthroid is converted into the LT3, which ISN'T ACTIVE!. T3 is the active hormone. Standard blood work measures both types (left and right molecules) together, so the physician believes the Synthroid has cured hypothyroidism. Moreover, my doctor prescribed too low a dose of desiccated thyroid. I take Thyroid 300, and my level of T3 is excellent, at the top of the normal range on my blood work. T3 promotes health, and low T3 increases age-related conditions. You want an A-level or higher.

A
Anonymous (Madison, WI, US)
300mg 60 Capsules
I'm not sure about the effectiveness

I'm not sure about the effectiveness. I haven't had a major change in my health. Maybe a few less hot flashes.

A
Alexander Garcia (Huntington, NY, US)
300mg 60 Capsules
Reliable, High-Quality Thyroid Support That Actually Made a Difference

I’ve had a great experience with Priority One Supplements Desiccated Thyroid 300 mg. The product has been consistent and high quality, and I’ve noticed improvements in my energy, focus, and overall sense of well-being since incorporating it into my routine under my healthcare provider’s guidance. I appreciate that Priority One Supplements offers a desiccated thyroid product that has been reliable and easy to use. The company’s commitment to quality gives me confidence in what I’m taking, and I’ve been very satisfied with both the product and the results. Highly recommended for those working with a healthcare professional to support their thyroid health

A
Anonymous (Albuquerque, NM, US)
300mg 60 Capsules
Exceeded my expectations

I had no idea how much my thyroid was affecting my overall health. Since starting the supplement 3 months ago, Ive noticed a significant difference in my energy level, brain fog is essentially gone, and unexpectedly I've even been able to get back to my normal weight! It's easy to take first thing in the morning & so far I have not noticed any negative side effects.

A
Anonymous (Delta, CO, US)
300mg 120 Capsules
I’ve been taking this thyroid for over 4 years

I i’ve been taking this thyroid for over 4 years. I was able to get off of armor thyroid and not have a prescription. I much prefer being on this desiccated beef thyroid, and am thankful it is available.

E
Erin Danford
300mg 60 Capsules
Thyroid 300 has helped me feel so much better

Thyroid 300 has helped me feel so much better. I have energy again. My moods are leveling out. I am thankful to feel good again

A
Anonymous (Ranchester, WY, US)
300mg 120 Capsules
Great customer service!

I received the supplements quickly and had a wonderful experience with customer service.

M
Meredith Collins (Enfield, CT, US)
300mg 120 Capsules
Thyroid 300mg for One with No Thyroid Gland

I've been taking Thyroid 300mg for about 4 months now instead of synthetic replacement hormone for irradiated thyroid gland over 20 years ago. It seems to be improving my digestion, but it's equivalent to a lower replacement level than my previous synthetic prescription. The 300mg has a lower equivalency than the 137mcg synthetic I was taking and I feel better with the change but have gained 20 pounds, so I may need an additional mg to equal the previous synthetic. It might be clearer in a few months.

S
Slbrashear (Columbus, IN, US)
300mg 60 Capsules
I've been using this product for awhile and have

I've been using this product for awhile and have noticed an increase in energy and less issues with low thyroid side effects.

F
Foodcoachmd (Davidsonville, MD, US)
300mg 120 Capsules
I have tried other thyroid supplements and this

I have tried other thyroid supplements, and this one is the only that has helped me. So grateful for it.

A
Anonymous (Fairfield, CT, US)
300mg 60 Capsules
Happy!

good product! good company!

L
Li (Tampa, FL, US)
300mg 60 Capsules
Very glad to have found

Very glad to have found PriorityOne!

T
Tania (Baton Rouge, LA, US)
300mg 120 Capsules
Works for my borderline thyroid numbers

I was cold all the time. Plus a number of other issues. But my thyroid numbers were within range, just barely. Since I did not need prescription medication, according to the doctors, I was told to try this. It has worked very well for me these past 10 years. And I will continue to use.

G
G Cam (Larkspur, CO, US)
300mg 120 Capsules
Thank you for the great product

This product has worked for me, and I'm grateful for the good prices I can get in bulk.

K
K Porter (Dallas, TX, US)
Clean and effective

This is a biblically clean alternative to porcine thyroid. I have been using this for years and it has kept my thyroid in check and not on prescription medication.

A
Anonymous (Columbia, SC, US)
300mg 60 Capsules
A quality support supplement

I’ve been taking these for 17 months at the recommendation of my functional
Dr. I am close to 68 years old and needed the additional support for my thyroid. It has helped my sleepy thyroid wake back up. I highly recommend as a support if you are trying your best to eat healthy and move more. I have been able to lose 30 pounds slowly with the addition of this and I can honestly say it has been a big contributing factor.

A
Angela Sauer (Canton, MI, US)
300mg 60 Capsules
I finally have energy!

First I want to say this is not medical advice. This is just my experience as a disclaimer. I have been taking NP thyroid since 2018. I started at 60 mg and have went up to 150 mg and back down to 120 mg I Have done blood work and my thyroid numbers have never been at a good range but not having the thyroid medication I definitely started feeling better taking it when I heard that the FDA was going to step in and make them do all sorts of things. I decided to start looking elsewhere. I hate being dependent on a script! I have been on one 300 mg Pill every day for a little over two weeks and man can I tell the difference I feel like I have my old self back energy clear minded. Looking forward to hopefully seeing the scale moving down as well. I am 52 and postmenopausal. Hope this helps somebody out there. Thank you for this product! Please never quit making it!😁

N
Nicole Knick (Rathdrum, ID, US)
300mg 60 Capsules
Feel great!

Feeling great after taking these! They’re tasteless and you don’t burp up any after taste.

r
rachel M (Canton, OH, US)
300mg 60 Capsules
Been using for 11 years

I had my thyroid removed 11 years ago I am allergic to all the covered thyroid medicine. I went to a natural doctor and she suggested thyroid 300 and I have been taking it ever since. I have my levels checked and they remain stable. Thanks for making such a good product.

L
Lyn (Oak Harbor, WA, US)
300mg 120 Capsules
Thyroid 300

Switching from a prescription drug to Priority One's natural thyroid 300 has been remarkable. Not only are there no side effects from a synthetic product that I previously experienced, but my body has responded well to the natural thyroid with better function as shown in recent lab work.

F
Foodcoachmd (Davidsonville, MD, US)
300mg 120 Capsules
Amazing!

I feel like I have my life back since I started taking Thyroid 300! I have more energy, and I can function better. My husband and son started taking it too and they feel much better. I am so grateful for Thyroid 300!!!

S
Sylvia White (Kissimmee, FL, US)
300mg 120 Capsules
Doctor recommended

Many years ago my naturopathic doctor recommended this for me as he saw in my bloodwork that my thyroid needed help. I’ve been taking it for years and it’s helped keep me healthy and off other thyroid medication. I highly recommend this product.

B
Brenda B (St Louis, MO, US)
300mg 120 Capsules
Totally Worth It!

I have been having issues with my thyroid for over 10 years. I've tried at least 7 other thyroid supplements and I keep coming back to Priority One. I recently had annual blood work and all.of my thyroid reading were well into the normal range but most important I don't feel as tired and sluggish as I did prior to taking Priority One.

S
Shel Steve
300mg 120 Capsules
Fantastic

Thyroid is amazing. I've been taking it for 3 months now, and it has completely changed my life. Went from needing a nap and just feeling exhausted all the time to being able to function daily!

R
Roseanne Edson (Seattle, WA, US)
300mg 60 Capsules
Great thyroid support!

My doctor recommended this to me and it has helped me so much! I take it every day and feel so much better than I was before. Highly recommend.