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Potassium Iodide vs. Kelp for Iodine: Which is better and why?

by (6229)
Updated 30 minutes ago
Created May 04, 2012 at 3:01 PM

What do you use and how much? Do you have any thyroid issues?

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2506 · February 23, 2013 at 6:38 PM

The iodine in iodized salt is rather minimal. With regular consumption you will get enough to avoid developing a goiter. But not enough to fulfill your body's need for iodine.

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379 · February 23, 2013 at 2:35 PM

What about iodized salt?

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2688 · January 18, 2013 at 7:40 PM

Iodoral 12.5mg tablet - 5mg elemental iodine, 7.5mg KI. Nearly the amount of iodine/iodide in the tyical Japanese diet.

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19120 · January 18, 2013 at 2:39 PM

Consider a good sourced kelp. You are going to have a harder time finding potassium iodide for iodine than kelp at supplement levels v. "medicinal".

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19120 · January 18, 2013 at 2:37 PM

You should edit to use two asterisks to make **lot** bold. 'Cause yeah, it's **a lot**.

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41471 · January 18, 2013 at 1:33 PM

To what anti-nutrients and heavy metals do you refer?

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2688 · January 18, 2013 at 1:09 PM

There I up voted you. I actually agree with your decision. I think seaweed, while good theoretically is very susceptible to contamination and not well tested or regulated.

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213 · January 18, 2013 at 12:49 PM

I am heartbroken over this downvote. Whatever will I do?

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368 · May 05, 2012 at 7:12 PM

@primallykosher, 1000 mcg (or micrograms) is the equivalent of 1 mg, or 0.001 g of iodine. You'd have to eat a tonne of kelp to reach that limit, but if supplementing with potassium iodide, that limit is quickly exceeded if one is not paying attention. The Food and Nutrition Board set upper limits at around 1000 mcg [http://www.tulane.edu/~icec/icecfaq.htm], but the recommended dose is between 150mcg-250mcg. But, iodine is necessary for optimal thyroid function. [http://thyroid.about.com/od/newscontroversies/a/toomuchiodine.htm]

C4f1a0c70c4e0dea507c2e346c036bbd
4111 · May 04, 2012 at 9:09 PM

what is 1000 mcg of iodine and how do you know that is the limit?

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4 Answers

Dbd1e8fad5d4b47409d84bd6610020d5
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368 · May 04, 2012 at 3:53 PM

I use Icelandic kelp for my iodine intake - potassium iodide has a -lot- of iodine and should only be used if you are in a severe radiation zone. I have no thyroid issues, but there is a noticeable difference if you are iodine deficient. I would recommend taking 1 225 mcg (iodine)/ 41 mg (kelp) pill every other day to prevent yourself from overdosing.

Most adults can take up to 1000 mcg/day safely, and 900mcg for pregnant women. Overdosing on iodine can shut down your thyroid, so I just like to supplement on the lower side for safety.

C4f1a0c70c4e0dea507c2e346c036bbd
4111 · May 04, 2012 at 9:09 PM

what is 1000 mcg of iodine and how do you know that is the limit?

Dbd1e8fad5d4b47409d84bd6610020d5
368 · May 05, 2012 at 7:12 PM

@primallykosher, 1000 mcg (or micrograms) is the equivalent of 1 mg, or 0.001 g of iodine. You'd have to eat a tonne of kelp to reach that limit, but if supplementing with potassium iodide, that limit is quickly exceeded if one is not paying attention. The Food and Nutrition Board set upper limits at around 1000 mcg [http://www.tulane.edu/~icec/icecfaq.htm], but the recommended dose is between 150mcg-250mcg. But, iodine is necessary for optimal thyroid function. [http://thyroid.about.com/od/newscontroversies/a/toomuchiodine.htm]

Ebb10603524dd22621c1155dd7ddf106
19120 · January 18, 2013 at 2:37 PM

You should edit to use two asterisks to make **lot** bold. 'Cause yeah, it's **a lot**.

E86132d3a1da945f5df0c6f16efacb4e
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0 · October 29, 2013 at 9:55 PM

Please forgive me for sounding rude here but I must call this out. Given that the body will excrete any excess iodine the limitation of 1000mcg isn't accurate. While the US RDA is in the order of 100-250 mcg (depending) that is the minimum required to prevent goiter. It doesn't help one achieve "optimum" health. Most iodine supplements vary in range from 12.5mg to over 100mg and are taken regularly as a supplement. The amount of iodine a person needs is determined not by a standard established over half a century ago but instead by your own body, health, stress, genetics, etc. In fact, people who eat a lot of sea vegetables will naturally consume over 12 mg of iodine a day. So, again recommending a limiting supplementation level for those who do not consume sea vegetables and loads of shellfish isn't practical. As for me, I take Potassium Iodide 50mg does the trick, but you may be different.. However, if the concern is a fully functioning thyroid and body overall you have got to consider selenium, zinc, tyrosine, magnesium, copper, etc. Iodine if found in greatest concentrations in the thyroid, breast tissue, ovaries and testicles (obviously depending on gender).. In fact for women who are very large breasted their concentration of iodine in the breast may exceed (likely) the 50mg of iodine stored in the thyroid. So again, how much is a question that would best be answered by your Dr. based upon the results of an iodine loading test. However, if you are supplementing I wouldn't be overly concerned (unless there are specifically concerning health factors of course), by limitations created by the USRDA or other governmental body. Most of their recommendations are either outdated, were completely inaccurate to begin with or were established to create a MINIMUM threshold. For example, the USRDA for vitamin D is 400iu. Which is enough to prevent rickets. However, your body will manufacturer tens of thousands of IU's a day if you are in the sun so which one's accurate? The gov't or your own body?

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50 · February 23, 2013 at 2:25 PM

This guest post on the Perfect Health Diet site, suggests that kelp may be sub-optimal due to other things it contains: http://perfecthealthdiet.com/2011/05/iodine-and-hashimotos-thyroiditis-part-2/

In Paul's supplement recs page he recommends potassium iodine pills, although later on in his seaweed section he does recommend some that contain kelp: http://perfecthealthdiet.com/recommended-supplements/

75d65450b6ff0be7b969fb321f1200ac
2506 · February 23, 2013 at 6:38 PM

The iodine in iodized salt is rather minimal. With regular consumption you will get enough to avoid developing a goiter. But not enough to fulfill your body's need for iodine.

32be195157f00ad15a933b8bb333dcc4
379 · February 23, 2013 at 2:35 PM

What about iodized salt?

4517f03b8a94fa57ed57ab60ab694b7d
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213 · January 18, 2013 at 11:10 AM

I am leaning towards potassium iodide, since I don't trust the antinutrients and heavy metals in the seaweed.

4517f03b8a94fa57ed57ab60ab694b7d
213 · January 18, 2013 at 12:49 PM

I am heartbroken over this downvote. Whatever will I do?

7f8bc7ce5c34aae50408d31812c839b0
2688 · January 18, 2013 at 1:09 PM

There I up voted you. I actually agree with your decision. I think seaweed, while good theoretically is very susceptible to contamination and not well tested or regulated.

7f8bc7ce5c34aae50408d31812c839b0
2688 · January 18, 2013 at 7:40 PM

Iodoral 12.5mg tablet - 5mg elemental iodine, 7.5mg KI. Nearly the amount of iodine/iodide in the tyical Japanese diet.

32f5749fa6cf7adbeb0b0b031ba82b46
41471 · January 18, 2013 at 1:33 PM

To what anti-nutrients and heavy metals do you refer?

Ebb10603524dd22621c1155dd7ddf106
19120 · January 18, 2013 at 2:39 PM

Consider a good sourced kelp. You are going to have a harder time finding potassium iodide for iodine than kelp at supplement levels v. "medicinal".

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