Minerals & electrolytes
Iodine
A mineral from seafood, dairy and iodized salt. Your thyroid needs it to make the hormones that control how your body uses energy.
52 products from US online stores, sorted by what 150 µg of iodine costs – not by the price per pack.
0.14¢Lowest cost
per 150 µg iodine
- Prices checked Nov 1, 2026, US
- No paid placements
What does 150 µg mean?
- iodine per serving in most of the products we checked
- 150–13,910 µgiodine per serving in most of the products we checked
- 150 µg is a fixed amount to compare by: half of the 52 products we checked have up to 325 µg per serving, the other half more.
- 150 µg is the amount recommended a day for adults (NIH (opens in a new tab)).
We compare by 150 µg only so products line up – it’s not a recommendation. Not medical advice.
Where products miss quality points
How the 52 products score
- Very good 90+: 0
- Good 75+: 51
- Fair 60+: 1
- Low under 60: 0
- have no seal from an independent testing program
- 100%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 5 whose label says “third-party tested”
The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.
We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works
Pack size
Compare packs of a similar size.
All sizes in one list can affect the results – big packs usually cost less per 150 µg. Pick a size above to compare packs that are alike.
37 of 52 products · cheapest per 150 µg iodine first
15 products are hidden
They have more than 1,100 µg iodine in one serving – more than the official upper limit a day for adults.
- Rank 1
NOW Foods
Organic Kelp Pure Powder
Powder
80Good qualityPacked in USA0.14¢per 150 µg
Lowest
- Pack
- $10.402,522 servings
- Iodine per serving
- 450 µg
- Pack lasts
- 7,566 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 2
Natural Factors
Liquid Kelp
Liquid
80Good qualityMade in Canada0.17¢per 150 µg
24% more
- Pack
- $14.3947.3 ml (1.6 fl oz)1,577 servings
- Iodine per serving
- 800 µgin 0.03 ml
- Pack lasts
- 1,576 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 3
Natural Factors
Liquid Kelp
Liquid
80Good qualityMade in Canada0.24¢per 150 µg
73% more
- Pack
- $19.9547.3 ml (1.6 fl oz)1,577 servings
- Iodine per serving
- 800 µgin 0.03 ml
- Pack lasts
- 1,576 daysat 150 µg a day
naturalfactors.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 4
Codeage
Liquid Iodine+, Unflavored
Liquid
80Good qualityMade in USA1.3¢per 150 µg
882% more
- Pack
- $26.991,200 servings
- Iodine per serving
- 250 µg
- Pack lasts
- 2,000 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 5
Life Extension
Sea-Iodine, 1,000 mcg
Capsules
65Fair qualityCountry not stated1.5¢per 150 µg
991% more
- Pack
- $6.0060 capsules
- Iodine per serving
- 1,000 µgin 1 capsule
- Pack lasts
- 60 daysat 1 capsule (1,000 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 6
Nature's Life
Icelandic Kelp, 41 mg
Tablets
80Good qualityCountry not stated2¢per 150 µg
1,373% more
- Pack
- $15.19500 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 500 daysat 1 tablet (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 7
NOW Foods
Kelp, 325 mcg
Capsules
80Good qualityCountry not stated2.2¢per 150 µg
1,483% more
- Pack
- $11.79250 capsules
- Iodine per serving
- 325 µgin 1 capsule
- Pack lasts
- 250 daysat 1 capsule (325 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 8
Nutricost
Iodine, 325 mcg
Tablets
85Good qualityPacked in USA2.3¢per 150 µg
1,572% more
- Pack
- $11.95240 tablets
- Iodine per serving
- 325 µgin 1 tablet
- Pack lasts
- 240 daysat 1 tablet (325 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 9
Nutricost
Kelp, 325 mcg
Tablets
85Good qualityPacked in USA2.3¢per 150 µg
1,572% more
- Pack
- $11.95240 tablets
- Iodine per serving
- 325 µgin 1 tablet
- Pack lasts
- 240 daysat 1 tablet (325 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 10
Life-flo
Liquid Iodine Plus with Potassium Iodide, Unflavored
Liquid
80Good qualityCountry not stated2.3¢per 150 µg
1,606% more
- Pack
- $10.6659.1 ml (2 fl oz)455 servings
- Iodine per serving
- 150 µgin 0.13 ml
- Pack lasts
- 454 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 11
Life-flo
Liquid Iodine Plus, Natural Orange
Liquid
80Good qualityCountry not stated2.4¢per 150 µg
1,679% more
- Pack
- $11.1259.1 ml (2 fl oz)455 servings
- Iodine per serving
- 150 µgin 0.13 ml
- Pack lasts
- 454 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 12
NutraChamps
Iodine Drops
Liquid
80Good qualityMade in USA2.5¢per 150 µg
1,746% more
- Pack
- $24.95590 servings
- Iodine per serving
- 250 µg
- Pack lasts
- 983 daysat 150 µg a day
nutrachamps.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 13
Nutricost
Iodine Tablets
Tablets
80Good qualityCountry not stated2.7¢per 150 µg
1,854% more
- Pack
- $13.97240 tablets
- Iodine per serving
- 325 µgin 1 tablet
- Pack lasts
- 240 daysat 1 tablet (325 µg) a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 14
Nutricost
Kelp Tablets
Tablets
85Good qualityCountry not stated2.7¢per 150 µg
1,854% more
- Pack
- $13.97240 tablets
- Iodine per serving
- 325 µgin 1 tablet
- Pack lasts
- 240 daysat 1 tablet (325 µg) a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 15
Nature's Life
Icelandic Kelp, 41 mg
Tablets
80Good qualityCountry not stated2.7¢per 150 µg
1,896% more
- Pack
- $10.29250 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 250 daysat 1 tablet (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 16
Swanson Vitamins
Kelp Iodine Source
Tablets
80Good qualityCountry not stated3¢per 150 µg
2,051% more
- Pack
- $11.09250 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 250 daysat 1 tablet (225 µg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 17
Heritage Store
Nascent Colloidal Iodine
Liquid
80Good qualityCountry not stated3.1¢per 150 µg
2,129% more
- Pack
- $24.7929.6 ml (1 fl oz)493 servings
- Iodine per serving
- 246 µgin 0.06 ml
- Pack lasts
- 493 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 18
MaryRuth's
Organic Iodine Liquid Drops, Unflavored, 250 mcg
Liquid
80Good qualityCountry not stated3.1¢per 150 µg
2,166% more
- Pack
- $21.9529.6 ml (1 fl oz)423 servings
- Iodine per serving
- 250 µgin 0.07 ml
- Pack lasts
- 422 daysat 150 µg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 19
Country Life
Arctic-Kelp, 225 mcg
Tablets
80Good qualityMade in USA3.7¢per 150 µg
2,614% more
- Pack
- $16.79300 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 300 daysat 1 tablet (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 20
Country Life
Arctic-Kelp
Tablets
80Good qualityMade in USA3.7¢per 150 µg
2,614% more
- Pack
- $16.79300 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 300 daysat 1 tablet (225 µg) a day
countrylifevitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 21
NOW Foods
Potassium Plus Iodine
Tablets
80Good qualityCountry not stated3.9¢per 150 µg
2,702% more
- Pack
- $10.40180 tablets
- Iodine per serving
- 225 µgin 1 tablet
- Pack lasts
- 180 daysat 1 tablet (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 22
NaturesPlus
Icelandic Kelp
Tablets
80Good qualityCountry not stated4.4¢per 150 µg
3,086% more
- Pack
- $13.14300 tablets
- Iodine per serving
- 150 µgin 1 tablet
- Pack lasts
- 300 daysat 1 tablet (150 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 23
Nature's Answer
Kelp Thallus - Veggie Capsules
Capsules
80Good qualityMade in USA5¢per 150 µg
3,530% more
- Pack
- $4.99100 capsules
- Iodine per serving
- 150 µgin 1 capsule
- Pack lasts
- 100 daysat 1 capsule (150 µg) a day
naturesanswer.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 24
Nature's Way
Kelp
Capsules
80Good qualityPacked in USA5.1¢per 150 µg
3,603% more
- Pack
- $16.49180 capsules
- Iodine per serving
- 270 µgin 1 capsule
- Pack lasts
- 180 daysat 1 capsule (270 µg) a day
naturesway.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 25
NaturesPlus
Kelp Tablets
Tablets
80Good qualityCountry not stated5.1¢per 150 µg
3,647% more
- Pack
- $15.45300 tablets
- Iodine per serving
- 150 µgin 1 tablet
- Pack lasts
- 300 daysat 1 tablet (150 µg) a day
naturesplus.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 26
Nutricost
Iodine
Capsules
85Good qualityMade in USA5.8¢per 150 µg
4,083% more
- Pack
- $14.95120 capsules
- Iodine per serving
- 325 µgin 1 capsule
- Pack lasts
- 120 daysat 1 capsule (325 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 27
Nutricost
Kelp, 325 mg
Capsules
85Good qualityMade in USA5.9¢per 150 µg
4,209% more
- Pack
- $15.40120 capsules
- Iodine per serving
- 325 µgin 1 capsule
- Pack lasts
- 120 daysat 1 capsule (325 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 28
Nature's Way
Kelp
Capsules
80Good qualityPacked in USA6.7¢per 150 µg
4,746% more
- Pack
- $11.99100 capsules
- Iodine per serving
- 270 µgin 1 capsule
- Pack lasts
- 100 daysat 1 capsule (270 µg) a day
naturesway.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 29
Oregon's Wild Harvest
Organic Kelp
Capsules
80Good qualityCountry not stated7.7¢per 150 µg
5,465% more
- Pack
- $18.3690 capsules
- Iodine per serving
- 400 µgin 1 capsule
- Pack lasts
- 90 daysat 1 capsule (400 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 30
Bluebonnet Nutrition
Atlantic Sea Kelp Iodine, 225 mcg
Capsules
80Good qualityCountry not stated8¢per 150 µg
5,704% more
- Pack
- $14.36120 capsules
- Iodine per serving
- 225 µgin 1 capsule
- Pack lasts
- 120 daysat 1 capsule (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 31
Oregon's Wild Harvest
Kelp Capsules
Capsules
80Good qualityCountry not stated9.6¢per 150 µg
6,857% more
- Pack
- $22.9590 capsules
- Iodine per serving
- 400 µgin 1 capsule
- Pack lasts
- 90 daysat 1 capsule (400 µg) a day
oregonswildharvest.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 32
Solaray
Iodine, 500 mcg
Capsules
80Good qualityCountry not stated9.9¢per 150 µg
7,095% more
- Pack
- $9.8930 capsules
- Iodine per serving
- 500 µgin 1 capsule
- Pack lasts
- 30 daysat 1 capsule (500 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 33
Pure Encapsulations
Iodine
Capsules
80Good qualityMade in USA$0.11per 150 µg
8,185% more
- Pack
- $20.50120 capsules
- Iodine per serving
- 225 µgin 1 capsule
- Pack lasts
- 120 daysat 1 capsule (225 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 34
Swanson Vitamins
Scottish Kelp - Made with Organic Sea Kelp
Capsules
80Good qualityCountry not stated$0.12per 150 µg
8,856% more
- Pack
- $11.9930 capsules
- Iodine per serving
- 487 µgin 1 capsule
- Pack lasts
- 30 daysat 1 capsule (487 µg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 35
NaturesPlus
Iodine, 150 mcg
Tablets
80Good qualityCountry not stated$0.13per 150 µg
9,147% more
- Pack
- $12.71100 tablets
- Iodine per serving
- 150 µgin 1 tablet
- Pack lasts
- 100 daysat 1 tablet (150 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 36
Swanson Vitamins
Scottish Kelp
Capsules
80Good qualityCountry not stated$0.13per 150 µg
9,304% more
- Pack
- $12.5930 capsules
- Iodine per serving
- 487 µgin 1 capsule
- Pack lasts
- 30 daysat 1 capsule (487 µg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 37
NaturesPlus
Potassium Iodide
Tablets
80Good qualityCountry not stated$0.15per 150 µg
10,776% more
- Pack
- $14.95100 tablets
- Iodine per serving
- 150 µgin 1 tablet
- Pack lasts
- 100 daysat 1 tablet (150 µg) a day
naturesplus.com (opens in a new tab)Checked Nov 1, 2026 · Label
Good to know
- Fact
- 10,776%more per 150 µg for the most expensive product than for the cheapest.
- Fact
- 1,373%more per 150 µg for the cheapest tablets than for the cheapest powder.
How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check
The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.
How we calculate
Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.
Found a mistake or a product we should add? Email us