The Best Kelp Supplements of 2024

Kelp supplements, also known as wakame or kombu, are typically made from dried and powdered kelp, which contains a wide range of beneficial nutrients such as iodine, iron, and antioxidants. Assuming you’re sourcing properly, I love kelp and consider it an essential supplement.

Kelp supplements offer various health benefits, from supporting thyroid function and boosting metabolism to promoting skin health and aiding weight loss. However, not all kelp supplements are created equal, and it can be challenging to determine which is best for your needs.

In this article, I take a closer look at kelp supplements, their health benefits, and the factors to consider when choosing based on a lot of testing and comparison.

I’ll also provide a list of the top 10 kelp supplements of 2024, along with a comparison of their prices and quality.

best kelp supplement review

NB: This website contains affiliate links; we may earn a commission from purchases made through those links. That never affects the price you’ll pay or the impartiality of our reviews.

The Five Best Kelp Supplements: Our Verdict

Vegavero Organic Iodine Supplement | NO Additives | 100% Natural Organic Scottish Sea Kelp | 150mcg Pure Iodine | 180 Sea Kelp Iodine Tablets | Vegan
NaturesPlus Icelandic Kelp - Natural Iodine Supplement from Kelp, Easy One A Day - Vegetarian, Gluten Free - 300 Tablets
Ezyleaf Iodine Supplement 450MCG Iodine Tablets | 40 Trace Minerals | Sea Moss, Sea Kelp, Potassium Iodide and Bladderwrack Seaweed | Natural Fillers | Non-GMO & UK ISO Certified | 90 Vegan Capsules
Indigo Herbs Kelp Seaweed Powder 100g | Ascophyllum nodosum | Natural Iodine Supplement
INNOPURE Sea Kelp Double Strength 2000mg - Rich in Iodine, Easy to Swallow Capsues (Not Tablets) Vegan Society Approved - 3 Month Supply, UK Made
Vegavero Organic Iodine Supplement | NO Additives | 100% Natural Organic Scottish Sea Kelp | 150mcg Pure Iodine | 180 Sea Kelp Iodine Tablets | Vegan
NaturesPlus Icelandic Kelp - Natural Iodine Supplement from Kelp, Easy One A Day - Vegetarian, Gluten Free - 300 Tablets
Ezyleaf Iodine Supplement 450MCG Iodine Tablets | 40 Trace Minerals | Sea Moss, Sea Kelp, Potassium Iodide and Bladderwrack Seaweed | Natural Fillers | Non-GMO & UK ISO Certified | 90 Vegan Capsules
Indigo Herbs Kelp Seaweed Powder 100g | Ascophyllum nodosum | Natural Iodine Supplement
INNOPURE Sea Kelp Double Strength 2000mg - Rich in Iodine, Easy to Swallow Capsues (Not Tablets) Vegan Society Approved - 3 Month Supply, UK Made
£14.99
£8.95
£13.99
£6.95
£12.99
Vegavero Organic Iodine Supplement | NO Additives | 100% Natural Organic Scottish Sea Kelp | 150mcg Pure Iodine | 180 Sea Kelp Iodine Tablets | Vegan
Vegavero Organic Iodine Supplement | NO Additives | 100% Natural Organic Scottish Sea Kelp | 150mcg Pure Iodine | 180 Sea Kelp Iodine Tablets | Vegan
£14.99
NaturesPlus Icelandic Kelp - Natural Iodine Supplement from Kelp, Easy One A Day - Vegetarian, Gluten Free - 300 Tablets
NaturesPlus Icelandic Kelp - Natural Iodine Supplement from Kelp, Easy One A Day - Vegetarian, Gluten Free - 300 Tablets
£8.95
Ezyleaf Iodine Supplement 450MCG Iodine Tablets | 40 Trace Minerals | Sea Moss, Sea Kelp, Potassium Iodide and Bladderwrack Seaweed | Natural Fillers | Non-GMO & UK ISO Certified | 90 Vegan Capsules
Ezyleaf Iodine Supplement 450MCG Iodine Tablets | 40 Trace Minerals | Sea Moss, Sea Kelp, Potassium Iodide and Bladderwrack Seaweed | Natural Fillers | Non-GMO & UK ISO Certified | 90 Vegan Capsules
£13.99
Indigo Herbs Kelp Seaweed Powder 100g | Ascophyllum nodosum | Natural Iodine Supplement
Indigo Herbs Kelp Seaweed Powder 100g | Ascophyllum nodosum | Natural Iodine Supplement
£6.95
INNOPURE Sea Kelp Double Strength 2000mg - Rich in Iodine, Easy to Swallow Capsues (Not Tablets) Vegan Society Approved - 3 Month Supply, UK Made
INNOPURE Sea Kelp Double Strength 2000mg - Rich in Iodine, Easy to Swallow Capsues (Not Tablets) Vegan Society Approved - 3 Month Supply, UK Made
£12.99

This website contains affiliate links. I may earn a commission from purchases made through those links. That never affects the price you'll pay or the impartiality of our reviews.

Best Organic Kelp Supplement: Vegavero

£14.99

The Vegavero Natural Iodine kelp supplement is my top choice for the best organic due to its organic Scottish kelp source, which is free from microbial contamination and pesticides.

It contains 150mcg of iodine per capsule, which is equivalent to 100% of the daily recommendation.

The supplement is also vegan, free from additives, and produced according to ISO 9001, HACCP, and GMP standards.

Vegavero highlights the importance of natural, organically bound iodine in high bioavailability and bioactivity.

Best Icelandic Kelp Supplement: Natures Plus

icelandic kelp supplement

The NaturesPlus Icelandic Kelp supplement is a powerful oceanic superfood due to its rich chlorophyll and iodine content derived from the finest Nova Scotia and Pacific Kelp.

Each tablet provides 150mcg of iodine, a natural source of chlorophyll, and is completely free from artificial colours and preservatives, making it pure and convenient.

The product is also gluten-free and suitable for vegetarians. NaturesPlus ensures quality manufacturing standards, adhering to FDA and NSF guidelines.

The supplement is intended to support thyroid hormone production, metabolic rate, energy levels, cognitive function, skin health, and nervous system function.

Best Kelp Supplement Complex: Ezyleaf

£14.99

The Ezyleaf Sea Kelp With Bladderwrack supplement is made from organic sea kelp and bladderwrack, providing 700mg of supplement per capsule, with a minimum of 400mcg of iodine.

The supplement is organic, vegan, gluten-free, and allergen-free, offering support for low thyroid function, immune function, and hair, skin, and nails.

The 90-day supply of 90 veg capsules provides great value and is suitable for vegetarians and vegans.

The supplement is manufactured in the UK in ISO 9001, GMP Certified Facilities using high-quality ingredients without fillers, ensuring strict quality standards are adhered to.

Best Budget Kelp Supplement: Indigo Herbs

£6.45

indigo kelp

Indigo Herbs Kelp Supplement is a high-quality, pure botanical ingredient suitable for vegetarians and vegans, produced to GMP standards.

The kelp is carefully selected, dried, and milled into a thick heavy powder that is tested for safety and purity. The powder is rich in iodine, vitamins, and minerals and can be used as a supplement or as a replacement for salt.

It can be added to liquid or smoothies, encapsulated, or used in cooking. Indigo Herbs is committed to providing premium quality botanicals and empowering optimum health and nutrition.

Best Super Strength Kelp Supplement: Innopure

£12.34

innopure kelp supplement

Innopure’s Sea Kelp Super Strength 2000mg is a high-quality supplement that is a rich source of vitamins and minerals.

It is vegan-friendly, gluten-free, and GMO-free. It contains 400ug of iodine per capsule, which helps to support healthy hair, hormonal health, weight management, and a healthy heart.

The supplement has received excellent reviews from customers and is manufactured in the UK to BRC global standards. Innopure offers free UK delivery and a 10% discount on subscriptions.

What’s the Best Kelp Supplement for Weight Loss?

Kelp may help with weight loss due to its natural fibre alginate, which can act as a fat blocker by stopping the absorption of fat in the gut.

When alginate is consumed, it forms a gel-like substance in the stomach that can bind to dietary fat, preventing its absorption by the body. This leads to a reduction in overall calorie absorption and may contribute to weight loss.

Studies have shown that alginate can decrease the absorption of dietary fat by up to 75%. It has also been shown to increase feelings of fullness and reduce hunger, which may further contribute to weight loss.

In addition to its potential weight loss benefits, alginate has also been studied for its ability to improve blood sugar control, lower cholesterol levels, and reduce inflammation in the body. However, more research is needed in these areas to fully understand its effects.

It’s important to note that while alginate may have potential benefits for weight loss, it should not be relied upon as a sole method for achieving weight loss goals. A balanced diet and regular exercise are still important components of a healthy lifestyle.

For cooking, I love the Mara kelp flakes, which are a great way to get the benefits of alginate in your cooking

How to Take Kelp Supplements Safely

Kelp supplements are generally safe for most people when taken in appropriate amounts, but it is important to follow certain precautions to ensure safety. Here are some tips on how to take kelp supplements safely:

  1. Follow the recommended dosage on the label: Do not exceed the recommended dose, as taking too much can cause adverse effects.
  2. Check with your doctor: If you have any medical conditions or take any medications, check with your doctor before taking kelp supplements.
  3. Avoid taking kelp supplements with other iodine-containing products: Consuming too much iodine can cause iodine toxicity, which can lead to thyroid dysfunction.
  4. Avoid during pregnancy and breastfeeding: Kelp supplements can contain high levels of iodine, which can be harmful to the developing fetus or infant.
  5. Choose high-quality supplements: Look for kelp supplements that are made by reputable companies and have undergone quality testing.
  6. Monitor for side effects: Watch for any adverse effects, such as nausea, vomiting, stomach pain, diarrhoea, or skin rash. If you experience any of these symptoms, stop taking the supplement and consult your healthcare provider.

What’s the Best Kelp Supplement for Dogs?

Kelp can provide a range of benefits for dogs, including improved coat health and growth, stronger pigmentation, and overall nutritional support. Kelp is a natural source of minerals and trace elements that can help support a dog’s immune system, promote healthy digestion, and provide important nutrients for joint and bone health. As a natural and safe supplement, kelp can be easily added to a dog’s daily diet in the form of powder or treats.

Dorwest Kelp Seaweed Powder is a nutritional supplement for dogs and cats that promotes thicker coat growth and stronger pigmentation. It contains a special variety of kelp, Fucus vesiculosus, which is rich in 37 minerals and trace elements that are essential for overall pet health. The kelp used in the product is harvested from sustainable deep-sea sources and tested to British Herbal Pharmacopoeia standards. It is made with 100% dried seaweed and contains no artificial ingredients.

What Factors Did Consider When Comparing the Best Kelp Supplements

When selecting a kelp supplement, it’s essential to consider several factors to ensure that you’re getting a high-quality product that meets your specific needs.

Here are some key factors I took into account:

  1. Iodine content: Kelp is a rich source of iodine, which is crucial for proper thyroid function. However, excessive iodine intake can lead to iodine toxicity, which can cause adverse health effects. It’s essential to choose a kelp supplement with a moderate iodine content that meets your daily iodine requirements.
  2. Quality and purity: Kelp supplements can be contaminated with heavy metals, such as arsenic, cadmium, and lead, as well as other pollutants. It’s crucial to choose a high-quality kelp supplement that has been third-party tested for purity and free of contaminants.
  3. Form and dosage: Kelp supplements come in different forms, including capsules, tablets, powders, and liquids. It’s essential to choose a form that is convenient and easy to take. You should also consider the dosage of the supplement and whether it provides enough iodine and other nutrients for your needs.
  4. Brand reputation and reviews: When choosing a kelp supplement, it’s essential to consider the brand’s reputation and read customer reviews. Look for brands that have a good reputation for producing high-quality and effective supplements.
  5. Other ingredients: Some kelp supplements may contain other ingredients, such as fillers, binders, and additives. It’s essential to read the label carefully and choose a supplement that contains only pure and natural ingredients.

Sea Kelp Benefits

Nutrient-Rich

Sea kelp is packed with essential nutrients, including vitamins (such as A, C, and E), minerals (such as iodine, potassium, calcium, and iron), fibre, and antioxidants.

Iodine Source

Sea kelp is particularly known for its high iodine content, which is essential for thyroid health and proper metabolism.

Thyroid Function Support

Sea kelp contains compounds called fucoidans that may help regulate thyroid hormone production and support healthy thyroid function.

Antioxidant Activity

Sea kelp contains various antioxidants, such as flavonoids, carotenoids, and vitamins, which help protect the body against oxidative stress and inflammation.

Digestive Health

The fibre content in sea kelp promotes improved digestion, regular bowel movements, and a healthy gut microbiome.

Skin and Hair Health

Sea kelp is beneficial for the skin and hair, providing nourishment, moisture, and potential benefits for hair growth and strength.

Weight Management

Sea kelp’s fibre content can contribute to a feeling of fullness, potentially aiding in weight management and healthy eating habits.

Kelp Supplements for Thyroid

Kelp supplements are often used by people who believe they may be deficient in iodine. However, it’s important to note that while iodine deficiency can lead to hypothyroidism (an underactive thyroid), this condition is relatively rare in developed countries due to the widespread use of iodized salt.

Moreover, excessive iodine intake can also cause thyroid problems. High amounts of iodine can actually trigger hypothyroidism in some people, and it can also cause hyperthyroidism (an overactive thyroid). Therefore, it’s important to be cautious with iodine supplements like kelp.

If you’re considering taking kelp supplements for thyroid health, it’s important to talk to a healthcare provider first. They can evaluate your individual needs and risks and guide you on the appropriate course of action. If you have an existing thyroid condition, you should also consult your healthcare provider before taking any new supplements, as they could potentially interfere with your current treatment plan.

Lastly, keep in mind that while kelp supplements can be a source of iodine, they should not be used as a replacement for a balanced diet and a healthy lifestyle. Other nutrients, like selenium and zinc, are also important for thyroid health and can be obtained from a variety of foods.

Frequently Asked Questions About Kelp Supplements

What are the benefits of taking kelp supplements?

Are there any side effects of taking kelp supplements?

Cara Hayes is an experienced natural health practitioner with a Masters in Clinical Nutrition & Dietetics from the University of Sydney. She has been writing for Plankton for Health since 2019 and contributes widely to many well-known health publications.