Best Seaweed Supplements for Optimal Health

By Amod Khan

Updated on

This content might include affiliate links that could provide compensation if you click or sign up.

As an Amazon Associate I earn from qualifying purchases.

Seaweed, a type of marine plant, has been eaten in Asian countries for ages. Nowadays, people are interested in its health benefits when taken as pills or powders. 

Seaweed is rich in vitamins, minerals, antioxidants, and fiber, all of which are good for you. Studies suggest these nutrients can improve health in various ways.


1. Nature’s Way Kelp Capsules 

These capsules are a great choice if you need a good source of iodine and other important nutrients. 

They contain concentrated kelp extract from clean ocean waters. Kelp is a type of brown seaweed known for helping thyroid health. 

By keeping your thyroid healthy, these capsules can improve metabolism, increase energy levels, and enhance overall health.

2. MegaFood Sea Vegetables

These supplements combine natural seaweed extracts like kelp, dulse, and bladderwrack.

They are full of vitamins, minerals, and antioxidants, boosting your immune system and overall cell function.

3. Nutricost Organic Spirulina Powder

Nutricost Organic Spirulina Powder isn’t exactly seaweed, but it’s closely related. It’s a kind of blue-green algae that has a lot of the same nutrients and benefits. 

That’s why we’ve included it in our list of top supplements for staying healthy. This powder is super easy to use and can fit into your daily routine without any trouble. 

Packed with protein, vitamins, and chlorophyll, spirulina helps your immune system, cleans out your body, and gives you energy. 

You can mix Nutricost Organic Spirulina Powder into smoothies, juices, or just plain water for a quick and refreshing boost.

4. Solaray Red Marine Algae

Solaray Red Marine Algae capsules are an easy way to get the benefits of red marine algae, such as dulse and Irish moss.

These seaweeds are packed with important minerals and polysaccharides, which have been researched for their ability to support your immune system and reduce inflammation.

By taking Solaray Red Marine Algae supplements, you can utilize their potent antioxidants and compounds to strengthen your immune system and maintain your overall health and energy levels.

5. The Pacifica Beauty Sea Algae

The Pacifica Beauty Sea Algae Anti-Pollution Gel Mask isn’t just for eating or taking as a supplement. 

You can also apply it directly onto your skin for a boost. This mask uses brown algae, kombu, and green algae to clean and moisturize your skin. 

It’s like giving your skin a refreshing drink while shielding it from pollution. 

Whether you use it weekly or daily, the Pacifica Beauty Sea Algae Gel Mask will leave your skin feeling revitalized, healthy, and glowing.

Best Brown Seaweed Extract Supplement

1. Horbäach Brown Seaweed Extract Capsules

Horbäach Brown Seaweed Extract Capsules offer a strong dose of brown seaweed extract, providing 2,000mg per serving. 

They also contain green tea extract, which adds more antioxidants. Horbäach is a reliable brand known for using ingredients that have been tested in laboratories.

2. NusaPure Brown Seaweed Extract

NusaPure Brown Seaweed Extract offers a hefty dose of brown seaweed extract, packing 6,000mg into each capsule. 

Plus, it contains BioPerine, which could help your body absorb the supplement’s nutrients better. NusaPure is a brand that’s vegan-friendly and free from gluten.

3. Eidon Ionic Minerals BSE

Eidon Ionic Minerals BSE (Brown Seaweed Extract) offers a moderate amount of brown seaweed extract, giving you 500mg per capsule. 

It’s a great choice if you’re just starting to take brown seaweed extract or if you’re on a budget. Eidon Ionic Minerals is a trusted brand known for its range of mineral supplements.

4. Life Extension Super Sea Iodine with Kelp

Life Extension Super Sea Iodine with Kelp is a supplement you take with your food. It gives you iodine that comes from kelp and bladderwrack. 

Kelp is a type of brown seaweed that’s full of iodine. Bladderwrack is another seaweed that also has iodine and other good stuff. 

This supplement helps your thyroid work well by giving it the iodine it needs to make thyroid hormones.

Best Organic Seaweed Supplement

1. Ocean green Organics Seaweed

Ocean Green Organics Seaweed Kelp Supplements are created from 100% pure organic seaweed collected from the wild waters of New Zealand. 

It’s loaded with essential vitamins and minerals, especially iodine, which is crucial for keeping your thyroid healthy. 

Plus, this supplement is suitable for vegans and those avoiding gluten.

2. Now Foods Organic Kelp

Now Foods Organic Kelp is a popular pick for folks seeking an affordable organic seaweed supplement. 

It’s crafted from kelp, a type of brown seaweed packed with iodine. Each serving gives you 150 mcg of iodine, supporting your overall health at a wallet-friendly price.

3. Dr.  Berg’s Nutritionals Organic Sea Kelp

Dr.  Berg’s Nutritionals Organic Sea Kelp Supplement is made from pure Icelandic sea kelp, providing natural iodine and other nutrients from the sea. 

Like the others, it’s vegan-friendly and free from gluten, offering a reliable source of nutrition from the ocean.

It’s crucial to recognize that the best supplement for you varies based on your unique health requirements. 

Consulting with a doctor before starting any new supplements is always the safest approach.

Best Seaweed Supplements for Weight Loss

1. Kelp

Kelp, a type of brown seaweed, is rich in iodine, an essential nutrient for thyroid health.

Thyroid hormones regulate metabolism, so there’s some evidence suggesting that kelp might aid in weight loss by supporting thyroid function.

2. Wakame

Wakame, another brown seaweed commonly used in Japanese cooking, is low in calories and high in fiber. 

This combination helps you feel full and satisfied, reducing overall calorie intake and supporting weight loss goals.

3. Bladderwrack

Bladderwrack is a brown seaweed that contains fucoxanthin, a compound believed to potentially reduce belly fat according to early research. However, more studies are needed to confirm this effect.

4. Fucoxanthin Supplements

Fucoxanthin, a pigment found in brown seaweed, has been studied for its ability to boost metabolism and promote fat burning. 

Supplements containing fucoxanthin may aid in weight loss when combined with a healthy diet and regular exercise routine.

Health Benefits of Seaweed Supplements

1. Rich in Nutrients: Seaweed supplements are packed with essential vitamins, minerals, and trace elements like iodine, calcium, magnesium, iron, vitamins A, C, and K, as well as omega-3 fatty acids.

2. Thyroid Support: Seaweeds like kelp, bladderwrack, and kombu, rich in iodine, can help support thyroid health by aiding in the production of thyroid hormones, crucial for regulating metabolism.

3. Antioxidant Boost: Loaded with antioxidants such as flavonoids, carotenoids, and polyphenols, seaweeds combat oxidative stress, reduce inflammation, and promote overall cellular health and longevity.

4. Heart Health: Certain seaweeds, especially brown varieties, contain compounds like fucoxanthin and fucoidans, which may help improve cardiovascular health by lowering cholesterol levels, reducing blood pressure, and enhancing heart function.

5. Weight Management: Studies suggest that seaweed may aid in weight management by promoting a feeling of fullness due to its fiber content, potentially leading to reduced calorie intake. 

Additionally, some compounds in seaweed may influence fat metabolism, though further research is needed for definitive evidence.

6. Digestive Wellness: Seaweeds are rich in soluble and insoluble fiber, supporting digestive health by regulating bowel movements, preventing constipation, and fostering the growth of beneficial gut bacteria.

7. Strong Bones: Seaweeds are excellent sources of calcium, magnesium, and vitamin K, crucial for maintaining bone strength and density, thereby helping to prevent conditions like osteoporosis.

8. Immune System Support: The immune-boosting properties of seaweed, thanks to its rich antioxidant and anti-inflammatory content, may help fortify the body’s defenses against infections and diseases.

9. Healthy Skin: Seaweed supplements contain skin-nourishing compounds like vitamins, minerals, and antioxidants, promoting hydration, improving skin texture, and protecting against premature aging caused by environmental factors.

Incorporating seaweed supplements into your diet can offer a wide range of health benefits and contribute to overall well-being. 

However, it’s crucial to select high-quality supplements and consult with a healthcare professional before adding them to your routine, especially if you have any underlying health conditions or concerns.

Safety Precautions & Tips for Using Seaweed Supplements


1. Seek Advice from a Healthcare Professional

Before incorporating any new supplements into your routine, especially if you have existing health issues or are pregnant or nursing, it’s crucial to speak with a healthcare provider.

They can offer personalized guidance based on your specific health circumstances and help determine if seaweed supplements are suitable for you.

2. Choose Trustworthy Brands

Opt for seaweed supplements from reputable and reliable brands known for prioritizing quality, purity, and safety. 

Look for products that have undergone third-party testing and adhere to strict quality control measures.

3. Stick to Recommended Dosages

Adhere to the recommended dosage instructions provided by the supplement manufacturer or as advised by your healthcare provider. 

Taking too much seaweed supplement can lead to adverse effects such as iodine toxicity or mineral imbalances.

4. Be Mindful of Iodine Levels

Certain seaweed supplements, especially those containing brown seaweed like kelp, may have high levels of iodine. 

Excessive iodine intake can disrupt thyroid function and cause thyroid-related issues. Keep track of your iodine intake from all sources, including supplements and iodized salt.

5. Watch for Allergic Reactions

 Some individuals may have allergies or sensitivities to seaweed or specific types of seaweed. 

If you experience any allergic symptoms like rash, itching, swelling, or difficulty breathing, stop using the supplement immediately and seek medical attention.

6. Avoid Contaminated Sources

 Ensure that the seaweed used in supplements comes from clean and uncontaminated sources to minimize the risk of exposure to heavy metals, pollutants, or harmful bacteria.

7. Store Properly

Store your seaweed supplements as per the manufacturer’s instructions, typically in a cool, dry place away from direct sunlight and moisture. 

Proper storage helps preserve the potency and effectiveness of the supplements.

8. Stay Hydrated

 Seaweed supplements, particularly those high in fiber, may increase your fluid needs. 

Stay adequately hydrated by drinking plenty of water throughout the day to prevent dehydration and support optimal digestion.

9. Monitor for Side Effects

Keep an eye out for any potential side effects or adverse reactions while taking seaweed supplements. 

Common side effects may include digestive discomfort, bloating, or diarrhea. If you experience persistent or severe side effects, stop using the supplement and consult with a healthcare professional.

By sticking to these safety guidelines and advice, you can make the most out of seaweed supplements while reducing the chances of any unwanted effects. 

Remember to pay attention to how your body feels, and if you’re unsure or have any worries about using seaweed supplements, it’s always a good idea to talk to a healthcare expert for guidance.


Seaweed supplements are a natural way to improve your health. They can help with metabolism, boost your immune system, and provide essential nutrients. 

Choosing good-quality supplements, taking the right amount, and considering your health needs are key. Give seaweed supplements a try and experience the benefits for yourself.


Which seaweed is healthiest?

There isn’t one seaweed that’s necessarily the healthiest overall, as each type offers its own unique set of nutrients.
However, some popular options include nori, kelp, dulse, and wakame, all of which are rich in essential vitamins, minerals, and antioxidants.

Which is better seaweed or kelp?

Seaweed is a broad term that includes various types like nori, kelp, and dulse. Kelp is a type of brown seaweed known for its high iodine content and is often used in supplements for thyroid health.
Both seaweed and kelp can be nutritious additions to your diet, depending on your health goals and preferences.

Is seaweed full of iron?

While seaweed does contain iron, the amount can vary depending on the type of seaweed. Generally, seaweed is not as rich in iron as other foods like red meat or legumes.
However, it can still contribute to your daily iron intake as part of a balanced diet.

Can you get enough Omega 3 from seaweed?

Seaweed is a source of omega-3 fatty acids, but the type it provides (ALA) is not as readily converted by the body into the forms (EPA and DHA) found in fatty fish.
While seaweed can contribute to your omega-3 intake, it may not be sufficient on its own to meet your needs. Including a variety of omega-3-rich foods in your diet, such as fatty fish or flaxseeds, can help ensure you get enough.

Amazon and the Amazon logo are trademarks of, Inc, or its affiliates