10 Best Kelp Supplement In 2023

Kelp is a brown algae, or seaweed, found in shallow, nutrient-rich coastal waters and coastlines worldwide. Coming in a range of forms including sheets, cushions and ribbons, it can be eaten and used in many parts of the world. Some types of kelp are rich sources of iodine and other essential vitamins and minerals. The most traditional use of kelp is food production on both industrial and artisan levels. This use takes place all over the world but particularly in East Asia, North America and northern Europe where kelp farming is widespread for human consumption, principally as a foodstuff known as nori or laver. In this article, we’ll look at everything you need to know about kelp, including how it works and its health benefits.

Comparison Table

Top 10 Best Kelp Supplement Reviews

1. Nature’s Way Kelp 600 mg Non-GMO

Nature’s Way Kelp is carefully tested and produced to superior quality standards. Nature’s Way Kelp is a nutritional seaweed guaranteed to contain iodine. Nature’s Way Kelp is produced according to the best practices for GMO avoidance. Contains no sugar, salt, yeast, wheat, soy, corn, dairy products, artificial colors, flavors or preservatives. Take 1 capsule daily.

Super Greens/325 Mcg Of Natural Iodine

Our Kelp is carefully tested and produced to superior quality standards. We are committed to creating the best-tasting, most healthful products possible. All of our products are non-GMO, vegetarian, vegan and gluten-free.

GMP Quality Assured

NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). An independent agency visits our facilities at regular intervals to ensure that we maintain the highest standards in manufacturing quality.

Power of Nature

It is our belief that these products are only as good as the indigenous regions from which they are derived and the time-honored traditions from which they are derived. When it comes to our understanding of natural health practices, there is so much to learn from the pioneers who first cultivated them. The only way we can keep our promise of maximum effectiveness, authenticity, openness and integrity is through this method alone.

2. NOW Supplements, Kelp 325 mcg of Natural Iodine

NOW Kelp is an excellent source of natural iodine. With 325 mcg per capsule, NOW Kelp supports healthy thyroid function and metabolism. Sustainably harvested from a cold-water ocean source, NOW Kelp is carefully cleaned, sorted, and processed to ensure that only the highest-quality kelp survives.

Grown in a pristine environment free of pesticides, herbicides or chemical fertilizers, our Kelp is then tested to ensure it meets our exacting quality criteria.

Super Greens/325 Mcg Of Natural Iodine

NOW Kelp delivers the natural nutrient profile found in Genuine Whole Foods. Kelp is one of the oldest and most complete vegan foods, containing a broad spectrum of carotenoids, chlorophyll and minerals such as iodine. Take 1 capsule daily with a meal for optimal dietary intake.

Supports Healthy Thyroid Function

NOW Kelp contains iodine from the brown seaweed, Laminaria Digitata. Brown seaweed is considered to be an excellent source of iodine, which has been shown to be essential for healthy thyroid function. Studies have shown that supplementation with iodine is effective in treating many thyroid issues.

GMP Quality Assured

NOW is committed to providing the highest quality nutritional supplements available. We continually strive to manufacture products that meet our high standards of excellence and purity. To achieve this, NOW has implemented the highest industry standard of quality control: Good Manufacturing Practices (GMP) Certification.

3. Raw Whole Food Iodine from Organic Kelp by Peak Performance

Peak Performance’s Raw Whole Food Iodine is made from all organic kelp, which is one of the richest sources of iodine in the world. It’s one of the most potent iodine supplements on the market and is ideal for anyone looking to improve their thyroid function by supporting metabolism, weight loss, energy levels and immunity.

Potency & Maximum Absorption

Raw whole food is better digested and assimilated into the body. Great for Thyroid Support, Hormonal Balance, Immune Support and Increased Energy Levels.*

Vegan Formulated

Free of Gluten, GMOs, Additives, Preservatives, Artificial Colors, Soy, and Dairy. Manufactured Under The Highest Quality GMP Regulations and USA Standards.


Most Supplements Sold Online Are Not 3rd Party Tested! This is a dirty secret that many supplement sellers don’t want you to know their products are NOT independently 3rd party tested outside of their own facilities. Why? Because it’s an extra out-of-pocket expense to conduct 3rd party testing and most companies will not sacrifice their profit.

4. Dr. Berg’s Sea Kelp Enhanced – Pure Healthy Thyroid Support Natural Antioxidants

Dr. Berg’s sea kelp enhanced is an all-natural iodine supplement formulated to support healthy thyroid function, balanced hormones and overall well-being. Each capsule is packed full of health-boosting vitamins, minerals and antioxidants. Our organic sea kelp is sourced from the coasts of Iceland and manufactured here in the U.S.A. Sea kelp is one of the best natural sources of iodine, which is essential for healthy thyroid function, balanced hormones and overall well-being.

New Enhanced Formula

Sea Kelp Enhanced is a new health-boosting formula that combines three unique types of algae only found in the pristine waters of Iceland. These algae include organic sea kelp (also known as laminaria), organic blue-green algae and wildcrafted red algae.

Correct Iodine Deficiencies

A single capsule of Sea Kelp Enhanced a day gives you 99% of your daily nutritional needs for iodine. Adding our Sea Kelp to your diet promotes normal and healthy iodine levels to help keep your thyroid functioning optimally. Sea kelp is also rich in the amino acid tyrosine, another essential nutrient for thyroid hormone production.

Vital Cardiovascular Support

Sea kelp contains certain beneficial nutrients that may help support the health of your heart and blood vessels. All three types of kelp found in Sea Kelp Enhanced are excellent sources of fiber and contain omega-3 fatty acids—both of which are great for promoting normal LDL cholesterol levels and supporting a healthy heart.

Committed To Satisfaction

If for any reason you’re not happy with the results you experience within the first 30 days, we’re happy to give you a refund! Simply send us a message. The refund will be processed as long as it is requested within 30 days of purchase. There is no need to return the product to us!

5. Oregon’s Wild Harvest, Certified Organic Kelp Capsules

Oregon’s Wild Harvest Kelp Capsules are made with certified organic kelp harvested from clean Atlantic Ocean waters off the coast of Nova Scotia. They are chock-full of nutrients, including natural iodine for support of a healthy thyroid and metabolism. Manufactured in Redmond, OR, Oregon’s Wild Harvest was founded in 1994 by a registered surgical nurse and farmer with a desire to create natural herbal supplements that give back to the earth through healthy soil, clean water, and the saving of our Non-GMO seeds.

Support Thyroid Health

Rich in nutrients and mineral content, kelp supplement supplies a significant amount of iodine, which is optimal in support of thyroid function and metabolism.

Protective Nutritional Support

Powerful 600mgs (per serving) of Certified Organic kelp thallus and 400mgs iodine (from kelp) responsibly harvested from clean Atlantic Ocean waters off the coast of Nova Scotia.


One of the most nutrient-rich algae on the planet, kelp has been used in traditional Chinese medicine for over 5,000 years.

Clean Ingredients

Made without artificial flavors, colors, excipients or stearates using verified Non-GMO ingredients. Free of gluten, dairy, wheat, peanuts, soy, and corn allergens.

Made In Oregon, Usa

All Oregon’s Wild Harvest products are proudly manufactured with love in Redmond, OR.

6. Natural Nutra Kelp Iodine Supplement, Supports Thyroid

Natural Nutra Kelp Iodine Supplement, Supports Thyroid, Strengthen Immune System, Regulates Metabolism, Boost Cognitive Ability, Vegan Sea Kelp, Atlantic Sourced Seaweed Extract 225 mcg 250 Tablets provides your body with a truly delicious and effective source of rich natural iodine. This potent formula improves thyroid glandular function and helps control your metabolism naturally. Our vegan kelp iodine supplements support healthy immune system function and contain no seaweed taste or odor.

Naturally Boost Metabolism, Detoxify Your Body And Strengthen Your Immune System

Kelp is naturally a rich source of nutrients, especially iodine. A healthy thyroid requires natural iodine to function properly. Our vegan kelp iodine supplements improve your thyroid glandular function in turn regulating your metabolism, detoxifying your body and boosting your immune system.

Pristine Formulation Free Of Taste & Odor

Our proprietary formulation method ensures these thyroid support tablets help regulate your body’s metabolism naturally. Our sea kelp extract is sourced from extremely pristine ocean waters off the beautiful coast of France. These natural tablets are free of any and all seaweed taste and odor yet are packed with completely natural ingredients procured right from the sea itself.

Bpa Free, Recyclable Glass Bottles

Cheap plastic bottles are harmful to your health. We seal your supplements in nonpolluting amber glass bottles with heat-sealed sleeves and best by dates to ensure the safest and purest product available. Unlike some other supplement manufacturers, our bottles are fully recyclable. Each bottle contains 250 tablets that are easy to swallow, Gluten-Free and Vegetarian.

Why Choose Natural Nutra As Your Supplement Source

Natural Nutra was established with one mission in mind; to provide the highest quality, all-natural supplements and socially responsible methods. Our products are proudly manufactured in the USA, are backed by extensive research and contain exactly what is presented on our labels.

Why Choose Natural Nutra As Your Supplement Source

Natural Nutra was established with one mission in mind; to provide the highest quality, all-natural supplements and socially responsible methods. Our products are proudly manufactured in the USA, are backed by extensive research and contain exactly what is presented on our labels.

7. Swanson Kelp – Natural Iodine Source Supporting Thyroid Health

Swanson Kelp is a unique formula that helps promote thyroid health. This ocean plant is packed with nutrients and features a rich source of iodine, an essential mineral known for healthy estrogen metabolism. With its potent combination of iodine and iodine-releasing substances, each serving of Swanson Kelp helps support healthy thyroid function.

Natural Thyroid Support

Swanson Kelp is a unique formula that helps promote thyroid health. A rich source of iodine, this ocean plant is packed with nutrients and is an essential mineral known to support healthy thyroid function.

Powerful Formula

This natural thyroid supplement delivers 225mcg sea kelp standardized to 0.4% iodine per tablet in an easy-to-swallow form you can take daily! Our natural formula is specially created for safe and effective wellness support.

Dosage Instructions

Our wellness supplements offer everyday solutions for an enhanced mind, body, and home using only the purest ingredients. For best results, take one tablet per day with water.

Our Quality Commitment

For nearly 50 years, Swanson has delivered science-backed health products worldwide. Each wellness supplement is made in our GMP-certified facilities, and our purity and potency testing include independent third-party labs.

Money-back Guarantee

At Swanson, we guarantee that every health product is made from the purest, freshest ingredients. If you aren’t satisfied with any product(s) purchased within the last 30 days, return the unused portion to us for a full refund.

8. Solid Gold SeaMeal Kelp-Based Supplement for Skin

Solid Gold SeaMeal Kelp-Based Daily Wellness Supplement offers a daily supplement to help support skin and coat, digestive and immune system health in dogs and cats. Utilizing seaweed, earth’s original Superfood, Solid Gold SeaMeal combines red, green and brown seaweed species to deliver transformational health benefits for skin and coat health. Since coat and skin issues often go hand-in-hand, digestive enzymes are added to support digestive health. Rich in Omega-3 Fatty Acids, flaxseed meal is included to provide additional support for skin and coat health.

Supports Skin & Coat

Solid Gold SeaMeal contains 60 trace minerals, 12 vitamins, 22 amino acids digestive enzymes and flaxseed to provide your pet with the ultimate ratio for a healthy soft coat.

America’s First Holistic Pet Food

Solid Gold has been delivering transformative nutrition for your pet since 1974, crafting recipes with functional superfoods, omega fatty acids, high-quality proteins, and protected probiotics to support gut health and overall well being

Complete Skin & Coat Support

Sourced from the coast of the United States, this carefully selected blend of seaweeds provides an excellent source of iodine and chlorophyll to provide important essential vitamins, minerals, amino acids and antioxidants for skin and coat and thyroid health.

Nutrient Packed Formula

Utilizing seaweed, earthâ€s original Superfood, Solid Gold SeaMeal combines red, green and brown seaweed species to deliver transformational health benefits for dogs and cats

Easily Mixable

SeaMeal can be mixed with your pet’s favorite wet food for daily feeding and is made with no artificial colors, flavors or preservatives. A 1 lb container provides approximately 3 month’s supply for a 25lb-50lb dog.

9. Country Life Norwegian Kelp 225 mcg

Country Life Norwegian Kelp is a natural plant source of iodine. Our unique blend of organic and wild-crafted kelp provides 225 mcg of iodine per serving. This amounts to 20% of the daily recommended intake for iodine. Country Life Norwegian Kelp is a delicious way to support your body’s natural processes while supporting your taste buds at the same time!

Clean Green Superfood

Kelp is a type of seaweed found in the ocean. Known as a green superfood, kelp is an excellent natural source of iodine, known for helping to support healthy thyroid function.

Responsibly Made

Certified non-GMO, gluten-free and vegan made with recyclable packaging the manufacturing of this product supports wind power. This product does not contain yeast, corn, soy, wheat, milk, salt, sugar, preservatives or artificial colors, flavors or sweeteners.

Freshness Of Ingredients

Manufacturing our own products means our products go from tested raw material to manufactured goods, to bottled and packaged, ensuring maximum potency throughout their shelf life.

Authenticity Of Ingredients

We always use a pure form of each ingredient and all our ingredients are laboratory tested to ensure accurate identification so you can be assured we use real, authentic ingredients.

Guaranteed Quality

Every bottle contains our Pledge of Integrity because, at Country Life, integrity is our number one ingredient. Because you deserve high-quality nutrition, specifically crafted with the high-quality standards to support your health. To guarantee our products are consistent of the highest quality and efficacy, we ensure that we operate an NSF-GMP compliant and USDA Organic certified manufacturing facility and that all of our products fulfill our Pledge of Integrity.

10. Yuve Natural Organic Sea Kelp Supplement

Yuve Thyroid Health helps support energy level and healthy weight. Our kelp derives from the clear, clean Atlantic waters off nonindustrial coasts and it’s free of chemicals. It’s also free of cruelty, gluten, and GMOs. Our tablets are 100% vegan, small, and easy to swallow

Supports Focus, Clarity & Metabolism

This nutrient-rich natural Sea Kelp Vitamin supplement is formulated to enhance your thyroid function by correcting iodine deficiency and supporting a healthy metabolism. Rev up your energy, stay focused, keep a healthy weight and feel better with Yuve Thyroid Health.

Kelp From Clean Atlantic Waters

Free of chemicals, kelp is a source of iodine, a nutrient needed for the production of thyroid hormone. The body does not make iodine, so it is an essential part of your diet. Iodine deficiency can lead to enlargement of the thyroid and hypothyroidism. Vegans may be at higher risk of not getting enough of this nutrient.

Supports Healthy Breast Tissue & Ovaries

The iodine and trace minerals in Yuve Thyroid Health help maintain healthy iodine levels which is a must for promoting the health of the ovaries. Iodine deficient breast tissue is susceptible to lipid oxidation. These tablets may also help support the menstrual cycle.

Vegan Formula

Yuve Thyroid Health is vegan, Non-GMO, certified gluten-free and Gelatin-Free. The easy-to-swallow taste-free tablets are also free of wheat, dairy, soy, yeast, sugar, sodium, artificial flavors, sweeteners, preservatives, colors, milk, peanuts, shellfish or fish. No added harmful chemicals or pesticides. Suitable for kids, vegetarians and vegans.

We Stand Behind our Products

Our all-natural Iodine supplement advanced formula is proudly manufactured in the USA in a facility that is both NSF and GMP certified. Unlike soft gels, tablets are small and super easy to swallow. Now 60days money-back guarantee.

What Is Kelp Supplement?

In the order Laminariales, kelp is just one of the many distinct species. Algae known as kelp is a type of brown algae that grows in abundance.

Laminariales seaweeds differ from each other in terms of color, flavor, and nutrient content, despite the fact that they are all members of the Laminariales family.

In shallow waters and along coastlines around the world, kelp is harvested. Kelp has a wide range of health benefits because of its high nutrient content.

Known as umami, the term refers to an intensely flavorful and savory taste that can be consumed either raw or cooked, or as a supplement.

Why Take a Kelp Supplement?

Best Kelp Supplement

Most people don’t have an iodine deficiency because of the strict diet required to avoid iodized salt (specialty salts aren’t iodized), dairy products, bread, and seafood. Nursing mothers and pregnant women, on the other hand, should take iodine supplements. Iodine can be obtained without kelp supplements at all. If you are concerned about getting the recommended amount of Iodine from kelp, you may be better off taking potassium iodide (which is commonly found in multivitamins) instead. Iodine from potassium iodide appears to be more easily absorbed than Iodine from kelp, so taking the supplement is just as good and maybe safer because you are more likely to get the listed amount of Iodine and there is less likelihood of contamination with arsenic or other heavy metals. You can also get your iodine from natural sources, such as kelp supplements, which have been carefully selected.

How To Choose Kelp Supplement?

When looking for a nutritional supplement, it’s important to consider the price, the quality of the product, the amount of each ingredient, and the suggested use. Although some brands are significantly more expensive than others, the cost is not always a reliable indicator of quality. Nutritional supplements are not subject to the same level of regulation as pharmaceuticals in some countries, such as the United States.

It is therefore wise to stick with supplements manufactured by reputable manufacturers. These businesses adhere to strict quality control procedures and routinely test their products to ensure that they are safe and effective. You should also take a look at the ingredients on the label. Before making a purchase, always read the ingredient list to make sure it doesn’t contain anything you don’t want, like allergens, added sugar, artificial sweeteners, or products made with animal products.

If you take a supplement that contains more than the recommended daily intake of a particular nutrient, you need to be careful not to overdo it.

In the event your doctor recommends that you take a higher dosage, you should choose one that provides enough to meet your needs.

What Are The Other Health Benefits Of Kelp?

Supplementing with kelp led to significant weight loss and increased energy, according to recent research. Using iodine from kelp to treat underlying hypothyroidism caused by an iodine deficiency may have such effects, but this has not been proven in a clinical setting.

What’s The Quality Of Kelp Supplements?

There is no room for error here. A safety concern was raised when ConsumerLab found that half of the iodine supplements tested contained up to two times the amount of iodine listed on the labels. This is concerning. These were also contaminated with arsenic, a highly toxic substance. Whether one type of kelp plant or a particular harvesting location is better than another cannot be determined with certainty due to a dearth of data.

How Much Kelp To Take?

Iodine’s recommended daily intake for adults is 150 mcg; however, during pregnancy and breastfeeding, this amount increases. In order to get 150 mcg, you will need between 30 and 150 mg of kelp powder or less if you are using an extract.

Safety Precautions

It is imperative that you consult with your primary care physician before starting an iodine supplement, as taking too much of the element can have life-threatening side effects.

It is possible that the symptoms of iodine toxicity can be mistaken for those of an iodine deficiency. Swollen necks, exhaustion, and weight gain are among the signs. Thyroiditis and cancer of the thyroid gland are two of the more serious side effects.

If large doses of iodine are consumed without the supervision of a doctor, acute toxicity from iodine is possible. Nausea, vomiting, fever, diarrhea, a slowed heartbeat, and burning in the throat and mouth are all symptoms of iodine toxicity.

There is a safe daily intake for healthy adults of 150 mcg of iodine. When a woman is pregnant or nursing, the daily dosage is increased to 220 mcg, and to 290 mcg, respectively.

A number of medications, including diuretics, certain blood pressure-lowering medications, and those used to treat hyperthyroidism, can interact with iodine and cause negative effects.

The most severe side effects are seen when iodine intakes exceed 1,100 micrograms per day or 733 percent of the recommended daily intake (RDI). As a result, unless under the guidance of a medical professional, you should never attempt to take doses higher than the daily recommended amount.

Frequently Asked Questions

What Are The Benefits of Kelp?

Kelp is packed with ten times the amount of nutrients found in any plant grown in soil, making it an excellent source of vitamins and minerals for the body. It is a natural source of iodine, a mineral our bodies need to make thyroid hormones, as well as a high concentration of antioxidants and important vitamins, including vitamin K.

Vanadium, a mineral found in kelp, has been shown to aid people with type 2 diabetes in controlling their blood sugar levels and improving their overall health. Cancers of the colon, breast, lung, and prostate have been shown to be slowed by kelp in recent studies.

While these studies are still ongoing, it has yet to be proven that keeping can prevent cancer in humans. Brown algae’s fucoxanthin, which is thought to aid in weight loss, is also being studied by researchers for its possible health benefits. It’s also claimed that kelp can boost your energy levels and improve your cognitive abilities.

Does Kelp Have Any Side Effects?

In order to get the most benefit from kelp, moderation is key. Consuming too much kelp can cause your thyroid gland to become overactive because of its high iodine content, which is considered safe for human consumption. Those with hyperthyroidism should avoid using kelp because it has been linked to an increased risk of developing the condition.

Kelp may also contain toxic metals like aluminum and lead because it is known to absorb nutrients from the water in which it grows. Choosing the right kelp supplement for your needs requires thorough research and confirmation that the product in question has been independently validated to ensure its high purity.

How Do I Take Kelp?

Powder, capsules, and tablets made from kelp are all options for kelp supplementation. In general, you should start by following the manufacturer’s serving guidelines, and as you progress through the treatment, you should adjust your dosage accordingly.

Adults should consume 150 mcg of iodine per day to maintain healthy thyroid function. The FDA recommends that adults and children over the age of four consume no more than 225 micrograms of the mineral per day.

It is highly recommended that you first consult with your primary care physician if you are experiencing thyroid problems.

Which Kelp Supplement Should I Choose?

A kelp supplement should be chosen based on personal preferences and needs. Most of the kelp featured in this roundup was harvested from the Atlantic Ocean, which is widely considered to be the best quality kelp.

The supplement must also be free of harmful additives or heavy metals, as well as tested by an independent party for purity and efficacy to ensure that it is safe to use. Because they are all simple to use and reasonably priced, you can’t go wrong with any of the nutritional supplements you choose.


We hope that the information that we have provided has given you a better understanding of what kelp is, its benefits, and how you can incorporate it into your diet. As you can see, there are many uses for kelp, and still, more research is being done to determine its full range of benefits. Whether a dietician, an athlete, or just someone who wants to eat healthily, we feel that including seaweeds in your daily meals will help you maintain a healthy lifestyle.

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