Napiers Seagreens
Organic HEBRIDEAN Kelp Capsules

Nature's 'almost perfect' multivitamin! Full of natural vitamins, minerals & essential micronutrients important for good health.

Did you know that around 2 billion people in the world are not getting enough iodine in their diet? Iodine is essential to thyroid function, energy levels, thinking, problem solving and memory skills, healthy skin and a normally operating nervous system. It is found in high levels in seaweeds.

If you feel run down and lacking in energy, forgetful, with dry skin, and your body is showing signs of being frayed around the edges, the vitality boost that chelated iodine can give you may make a huge difference.

90 x 500 mg capsules per bottle.

Health claims

  • Iodine contributes to the normal production of thyroid hormones and normal thyroid function 
  • Iodine contributes to normal cognitive function (e.g. thinking, problem solving and memory skills)
  • Iodine contributes to normal energy yielding metabolism
  • Iodine contributes to the maintenance of normal skin
  • Iodine contributes to normal functioning of the nervous system

Many 'man made' vitamins and minerals are not easily absorbed by the body so it is important to get them from natural sources that our body can digest. Seaweed is a whole, complete food that mankind has eaten since the dawn of time and perfectly suited to our bodies.

Why Organic?

Our pure wild organic seaweed is sustainably harvested from the clear waters off the remote conservation islands of the Outer Hebrides. This method of harvesting and drying is essential in:
preserving the ocean - it doesn't strip out all life from the sea bed maintaining purity - not contaminated with metals or effluent maintaining all nutrients - through gentle drying of the seaweed  

Many cheap commercial sources heat the seaweed so high in the drying process, that little goodness remains. Our Seagreens kelp is over 60% higher in all tested vitamins and minerals and contains over 60% less silica (sand!).


Each capsule contains:

500 mg Seagreens® 100% certified organic kelp Ascophyllum nodosum .

(Vegetarian capsule: water, hydroxypropylmethylcellulose.)

Each capsule contains a good source of iodine 350µg (mcg).

 *1g = 1000mg = 1000000µg

100% Vegan. Contains no animal products. The capsule shell is made from easily digested plant-derived cellulose. Also certified kosher.

Read more about the safe levels of iodine in Napiers seaweed products

Nutritional Data

Each capsule of 500mg Seagreens kelp typically contains:

Vitamins:  A (antioxidant) 89µg, B group including B9 (0.286µg) and B12 (0.0005µg), Thiamine, Riboflavin, Niacin, Pantothenic acid, Pyridoxin, Choline and Cobalamin) 4.45µg,C (antioxidant) 0.625mg, D (Cholecalciferol) 0.005µg, E (antioxidant) 0.115mg, H (Biotin) 0.15µg and K (Menadione) 5µg. 

Minerals:  Calcium 7mg, Magnesium 3.2mg, Nitrogen 5.25mg, Phosphorus 0.75mg, Potassium 15.5mg, Sodium 13.5mg, Sulphur 15mg.

Amino acids:  Histidine trace, Isoleucine 1.165mg, Leucine 2.65mg, Lysine 1.39mg, Methionine 0.34mg, Phenylalanine 1.33mg, Threonine 1.4mg, Tryptophan trace, Valine 1.315mg, Alanine 1.95mg, Arganine 1.215mg, Aspartic acid 3.6mg, Cysteine 0.45mg, Glutamic acid 0.70mg, Glycine 1.95mg, Proline 1.5mg, Serine 1.125mg, Tyrosine 0.525mg. 

Trace elements:  Antimony trace, Boron 0.03mg, Cobalt 2.7µg, Copper trace, Fluorine 0.1mg, Germanium trace, Gold trace, Iodine 350µg, Iridium trace, Iron 350µg, Lithium trace, Manganese 0.015mg, Molybdenum 0.325µg, Platinum trace, Rubidium trace, Selenium 0.075µg, Silicon 0.5mg, Silver trace, Tellurium trace, Titanium trace, Vanadium 1.15µg and Zinc 20µg. 

With busy lifestyles we don't always get the nutrition we need from our diet. Undernourishing the body, without all the nutrients it needs, can be at the bottom of a lot of health conditions from fatigue, to digestive problems and even joint pain. 


Adults and children over 12 years:
One capsule per day, at meals. Take with water or add to food, juice or a smoothie. 

Children over 4 years:
Contents of half a capsule per day in food or juice. Sprinkle on to food to add a nutritional boost.

For those with higher nutritional needs, higher amounts can be taken - a gram is 2 capsules - but we do not recommend exceeding 4 grams (8 capsules a day).

Taking a gram of seaweed a day can help to ensure your vitality and energy, and keep you feeling happy, healthy and active. 

Seagreens is a good source of iodine and one a day meets all your daily requirements, even when you are pregnant or breastfeeding which is when your body needs more iodine to support the healthy growth and development of your baby. 


Do not take kelp capsules if you are allergic to iodine or seaweeds.

We advise that you take special care in taking kelp if you are taking thyroid medication or have a thyroid condition.

Underactive thyroid due to iodine insufficiency

If you have an underactive thyroid gland that has been caused by iodine insufficiency you may find that you need to take less levothyroxine as the iodine content of your diet increases.

If you take a capsule of knotted kelp a day as well as thyroxine, your thyroxine dose may well need to be lowered. If you intend to take both together we recommend that you introduce the kelp 4 weeks before your next TSH serum blood test and inform your doctor so that your medication can be adjusted accordingly, if applicable. More information about our experience with customers taking seaweed while on medication is here.

Underactive thyroid due to auto-immune diseases

If you have an auto-immune thyroid condition such as Hashimoto's disease you may be very sensitive to even small fluctuations of iodine in your diet.  

Underactive thyroid due lack of a functioning thyroid gland

Seaweed is a source of dietary iodine and not a source of thyroid hormones. If your underactive thyroid is due to a damaged or lack of a functioning thyroid gland, you will probably always require levothyroxine or a dessicated thyroid supplement.

It is always best to advise your doctor or medical herbalist about any significant changes to your diet and lifestyle.


You and Your Thyroid infographic

Tired All the TIme? Thyroid and Iodine Insufficiency by Monica Wilde

Thyroid, Iodine and Seagreens by Dr Craig Rose, PhD.

Iodine Levels in Seaweed by Monica Wilde

Talk Slides

Iodine, Seaweed & Your Thyroid in Fertility, Pregnancy and The Early Years: 
Seaweed Talk by Monica Wilde, RBGE 2015
Download slides from the talk

Iodine Supplementation, Seaweed and Your Thyroid; Malnourished at 20, Exhausted by 40: 
Seaweed Talk by Monica Wilde, RBGE 2015
Download slides from the talk

Add to BagNapiers Phytologic® Seagreens Hebridean Kelp 90 Capsules £18.50
Buy 2 bottles (180 capsules) for £17.75 each.
Buy 3 bottles (270 capsules) for £16.75 each.
I want to know iodine facts
by Rabin submitted on 09/03/2018
One tablets of kelp how much mcg of iodine ? I want to buy from amazon so I want to know the fact I have hypothyroidism

Answer: Each capsule of Napiers kelp contains 350 mcg of iodine. We don't sell tablets and other brand products on Amazon may vary considerably. Also some other supplements contain potassium iodide which acts a little differently in the body to seaweed iodine.
My one stop supplement!
by KC submitted on 14/10/2016
Be careful where you buy seaweed- I trust Napiers for my organic kelp free of the nasties that water now contains.
Always the one I trust
by Sue submitted on 23/05/2016
Wouldn't go anywhere else for my seaweed supplement.
Napiers Hebridean Organic Kelp
by Ursula submitted on 03/09/2015
Several years ago I was diagnosed with Hypothyroidism and prescribed Thyroxin. As I am not keen on pharmaceuticals I decided to try Napiers Hebridean Organic Kelp Tablets. They have been a most effective natural alternative. I have annual blood tests and my thyroid levels always come back as normal. I researched Kelp tablets carefully before taking them and Napiers to be the purest I could find.
by Valeria submitted on 01/03/2015
I have thyroid problem and feel always tired. Thanks to Napiers Seagreens I feel more energy and the tiredness has almost gone. I can only recommended! Thanks!
Hebridean Seagreens Organic Kelp
by Lesley submitted on 03/02/2015
Have been taking Seaweed capsules for less than a week. Feeling more alert and have more energy. Thyroid problems are in my family and have bloods taken to check my thyroid but according to results normal. I think I may be borderline. Anyway can highly recommend them.
Great product
by David submitted on 30/01/2015
Bought this because I was feeling tired and a friend said my iodine levels might be low. Started taking 1 or 2 capsules a day depending on how I feel and it's great! Thanks!!!

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© Napiers Herbals Ltd 2020 • Bathgate, Edinburgh & Glasgow • Herbalists and Medical Botanists since 1860
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