Ingredient 7 of 9
Iodine in Prostadine: The Ingredient With a Real Safety Limit
Iodine is the seventh line on the Prostadine info page and the only ingredient with a bottle-front tile. Adults need 150 mcg a day and the upper limit is 1,100 mcg. Four more lines are seaweeds, so the total is unknown. People with thyroid conditions should ask a doctor first.
Written by the Prostadine label deskUpdated
What it is01
What iodine does, and why this bottle puts it on the front
Iodine is a trace mineral that the thyroid gland uses to make thyroid hormones. The body cannot make it, so it has to come from food such as iodized salt, dairy, eggs, seafood and seaweed (ATA, Iodine deficiency).
The bottle photographs show a small periodic-table tile reading 53, I, Iodine. The info page lists “Iodine” on its own as the seventh of nine lines and gives it the benefit lines “Supports the urinary tract” and “Maintains healthy prostate function”. Neither is a use that iodine is known for. Its established job is the thyroid, and we found no prostate trial of iodine supplements.
What makes iodine important on this label is not the benefit lines. It is the arithmetic. Nori, wakame, kelp and bladderwrack are all seaweeds, and seaweeds are the richest natural source of iodine. With iodine itself on the list, five of nine lines can add to the same total.
| Name on the info page | Iodine |
|---|---|
| What it is | Trace mineral; supplements are usually potassium iodide |
| Place on the info page | 7 of 9 (not a verified weight order) |
| Amount in Prostadine | Not printed in any image we have |
| Amount used in research | RDA 150 mcg a day; upper limit 1,100 mcg a day (adult men) |
| Strength of evidence | Essential for the thyroid; no prostate trial found |
| Marketed or traditional use | Thyroid hormone building block |
| Main caution | Too much can cause thyroid problems; interacts with some thyroid, heart and blood pressure medicines. |
| Info-page benefit lines | “Supports the urinary tract” / “Maintains healthy prostate function” |
The numbers02
Need, ceiling and what seaweed can add
Three published numbers frame the question. Adults need 150 micrograms a day. The tolerable upper intake level is 1,100 micrograms a day. The American Thyroid Association advises against taking iodine or kelp supplements that provide more than 500 micrograms a day (NIH ODS, Iodine) (ATA, Excess iodine).
Daily iodine, micrograms
Four of the nine lines are seaweeds and one is iodine itself, and seaweed iodine varies from 16 to 2,984 mcg per gram (NIH ODS, Iodine). The ATA advises against iodine or kelp supplements above 500 mcg a day (ATA, Excess iodine). The bar for Prostadine is hatched because no amount is printed.
Seaweed is where the range explodes. The NIH lists seaweeds from 16 to 2,984 micrograms per gram, and a 5 g serving of dried nori flakes gives about 116 micrograms (NIH ODS, Iodine). A single gram of the richest seaweed in that range is about 2.7 times the upper limit. The ATA also notes that some kelp and iodine supplements hold up to several thousand times the upper limit (ATA, Excess iodine).
That does not mean Prostadine contains such amounts. It means nobody can tell from the information given, and a label that names four seaweeds plus iodine invites the question.
Who should ask first03
People for whom extra iodine is a real issue
For most healthy adults an occasional excess is tolerated, which is why an upper limit exists with a safety margin. The risk sits with particular groups, and the ATA names several: older adults, pregnant and breastfeeding women, infants and people with existing thyroid disease (ATA, Excess iodine).
| If this applies to you | Why it matters | What to do |
|---|---|---|
| Existing thyroid disease or a goiter | Excess iodine can cause hypothyroidism, hyperthyroidism or thyroiditis (NIH ODS, Iodine) | Show the bottle to your doctor before the first dose |
| Taking an antithyroid medicine | Iodine adds to the drug's effect and can cause hypothyroidism (NIH ODS, Iodine) | Ask the prescriber; do not change the medicine yourself |
| Taking an ACE inhibitor or a potassium-sparing diuretic | Potassium iodide with these can raise potassium (NIH ODS, Iodine) | Ask a pharmacist about the combination |
| Over 65 | Named by the ATA as more vulnerable (ATA, Excess iodine) | Mention the supplement at your next check |
If none of that applies, the sensible step is still to tell your doctor and pharmacist that the bottle contains iodine-rich seaweed, since thyroid tests and medicines are affected by iodine.
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See packsHow to check04
How to find out how much iodine is in your bottle
Look for the Supplement Facts panel
A compliant panel lists iodine in micrograms, often with a percent of the Daily Value. The bottle photographs we have show no panel, so use the one on your own bottle.
Add the seaweeds if they are not itemised
If the panel shows a blend total but not iodine, ask the seller for the iodine content per serving, in writing, with the lot number.
Compare with 150, 500 and 1,100
Under 150 is below the daily need; the ATA advises against supplements over 500; above 1,100 breaches the upper limit for that day on its own (NIH ODS, Iodine).
Remember your diet
Salt, dairy, eggs and fish add iodine, so the supplement's number is one part of the daily total, not the whole.
If a seller cannot give a number, treat that as information. The iodine and thyroid page has a longer walk-through and a question list for your doctor.
Verdict05
Iodine is useful, essential, and easy to overshoot
What is in its favour
- An essential nutrient with a clear daily need of 150 mcg (NIH ODS, Iodine)
- Easy to check once a panel is printed
- Well understood thyroid effects
What counts against it
- No prostate trial found for the benefit lines
- Four more seaweed lines add to the total
- The total amount is not printed
Iodine is the line on the label that most rewards a careful read. Use the kelp and bladderwrack page and the nori and wakame page to see the other four sources.
- Iodine: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements, 2024.RDA for adults is 150 mcg a day; the tolerable upper intake level is 1,100 mcg a day. Dried nori, 2 tablespoons of flakes (5 g): 116 mcg. Seaweeds range from 16 to 2,984 mcg per gram. High intakes can cause goiter, elevated TSH and hypothyroidism, and iodine-induced hyperthyroidism and thyroiditis. Interactions: antithyroid drugs (additive effect, hypothyroidism), and potassium iodide with ACE inhibitors or potassium-sparing diuretics (hyperkalemia risk).
- ATA Statement on the Potential Risks of Excess Iodine Ingestion and Exposure. American Thyroid Association, 2024.Iodine is needed for normal thyroid function (150 mcg a day for adults). Intake above 1,100 mcg a day is not recommended. Many iodine, potassium iodide and kelp supplements contain amounts far above the upper limit, by up to several thousand times. The ATA advises against taking iodine or kelp supplements that provide more than 500 mcg of iodine a day. Older adults, pregnant and breastfeeding women, infants and people with existing thyroid disease are more vulnerable.
FAQ06
Prostadine questions people ask
How much iodine is in Prostadine?
The amount is not printed in any image or page we have. Four of the nine lines are seaweeds and one is iodine itself, so the total could be small or large. A Supplement Facts panel would settle it.
What is the upper limit for iodine?
For adults the tolerable upper intake level is 1,100 mcg a day, and the American Thyroid Association advises against iodine or kelp supplements above 500 mcg a day (NIH ODS, Iodine) (ATA, Excess iodine).
Is iodine good for the prostate?
We found no trial showing that iodine supplements help the prostate. Its established role is making thyroid hormone, and too much can disturb the thyroid (NIH ODS, Iodine).
Can I take Prostadine if I have a thyroid condition?
Ask your doctor before the first dose and show them the bottle. Excess iodine can cause both underactive and overactive thyroid problems (NIH ODS, Iodine). Do not stop thyroid medicine without medical advice.
Who wrote this07
Written and reviewed by
Pages built from the bottle photos, the info page and linked NIH, FDA, NCI, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a licensed U.S. retail desk for Prostadine, not by the manufacturer. We earn money when you buy through our order links.
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