Seaweed Hair Conditioner, skin and scalp detox and mineralization, detox bath

(5 customer reviews)


Our dried Scottish seaweed (fucus serratus) makes one of the most versatile and health giving hair and scalp conditioners. For the skin too, it has powerful detox and nutritive qualities. Use it alone or with rhassoul clay or henna.



Seaweed hair conditioner. Serrated wrack (fucus serratus) a dried seaweed is sourced from the west coast of Scotland. Seaweed has a long history of cosmetic usage in Britain and appears in many ancient hair and skin recipes. Serrated wrack is especially high in fucins and alginates making it the ultimate natural hair conditioner and the perfect partner for clay hair washers. Seaweed is both remineralizing and detoxing and does wonders for the scalp and skin promoting hair growth and top quality skin. It is especially recommended for psoriasis and eczema and for anti-aging.

Add the dried seaweed to the bath for easing aches and relaxing. Or follow our instructions, soaking the sprigs in cold water to make a versatile seaweed extraction to be used alone, in combination with clay or henna, or in your own seaweed recipes for the hair, body and face.

Our seaweed stock is serrated wrack and it has wonderful conditioning qualities.

When seaweed is soaked in water it yields ‘seaweed oil.’ Although this substance contains some actual seaweed oil (all plants contain some oils), the extraction yields, a water based compound with an oily, slippery feel due to the high quantities of fucins and alginates contained in fucus serratus species. These substances, concentrated in seaweed have a powerful detox function.

In addition, the 92 minerals and trace elements, 25 vitamins, proteins, amino acids, enzymes pigments and antioxidants contained in seaweed perform their intensive health giving works with the power in the way that no land plant can exceed.

See weed can be used in the bath, in the shower, wet room, at the sink, in a foot bath or while out camping. We supply the seaweed hair conditioner in the dried form.

How to Make the ‘Seaweed Oil’ or Seaweed Extract

The Cold Infusion Method

The Recommended Method Developed by Natural Spa Supplies

At Natural Spa Supplies we have developed our own instructions which help you to get the very most out of the seaweed, in the simplest way.

If you are going to use the seaweed on the scalp, hair, skin, or in recipes, you will need to make a cold infusion of seaweed hair conditioner first. The extraction or ‘seaweed oil’ is used in hair mixed with rhassoul clay as a shampoo-conditioner or as a rhassoul and seaweed extract hair mask.

The extract can be used alone as a conditioning rinse. Seaweed extract can be applied to the skin on its own or mixed with clay, henna or other powdered cosmetics.

How to Make Your Seaweed Extract

Start off by standing about 10g of dried seaweed in 200ml of cold or luke warm water. Within 10-20 minutes the water takes on some colour. If you leave it for a hour or two, the extract becomes an amber colour as shown in the photograph. This is your seaweed hair conditioner. If you are curious 10g of dried fucus serratus weighs about 40g when hydrated.

If you use warm water the seaweed will yield is ‘oil’ more quickly and it could be at the this concentration within 15 minutes. Scale the recipe the water temperature and timing up or down as you judge fit.

We prefer to use cold water and let it take a bit longer as we want to keep the seaweed hair conditioner as fresh as possible between uses. Plants never like hot water! Hot water destroys the plant enyzmes which provide us with additional benefits and which keep the seaweed fresher for longer! Try to use the seaweed oil extraction you have made within a week, before these enzymes break down naturally. It is better if you can keep your seaweed extra in the refrigerator unless you are going to use it all straight away.

Once you have made up your solution, you have two options:

Dry the Seaweed

If you have made enough seaweed oil to last over the next week then remove the seaweed and let it dry somewhere. Go ahead an use the extract directly on the skin, scalp and hair or in your clay and henna recipes. Seaweed copes well with being dried and then hydrated. You can refrigerate the extract if you you are not going to use it straight away.

Or Keep on Extracting

If you need more seaweed oil, just top up it up with more water to get a second, third and further extractions. Each extraction will get progressively weaker. Hence I use warm and then hot water in these further extraction to maximize the concentrations of the extractions. My final extraction most dilute extraction goes straight in to the bath and I benefit from it that way.

Using the Seaweed Directly in the Bath – Detox, Remeneralize, Ease Aches and Pains

If you are not planning on applying the seaweed oil to the hair, or scalp, or in a concentrated form directly to areas of skin, you will not need to make a cold extraction first. You can just add the dried seaweed directly to the bath while it is running. It is ideal if you are bathing to relieve aches and pains, detox bathing and to remineralize. Take the seaweed out of the bath before you empty the bath, rinse the seaweed in fresh water, then hang it somewhere to dry.

Using the Seaweed To Make Rhassoul and Seaweed Clay Shampoo – Promote Hair Growth, Quality and Condition

Well conditioned hair is soft, tangle free, sleek, smooth, relaxed and strong.

Make up the seaweed extract and use it to hydrate the clay – put the clay powder in a dish (a breakfast bowl is ideal to start with), shake it level and pour enough seaweed oil over the clay until it is just covered. Don’t mix or stir.

In a few minutes the clay and seawead acquire a soft mousse like consistency and it is ready to use.

This powerful detox combination will be ready to use for washing the body or short hair. Add a greater quantity of seaweed oil for longer hair so that you have an easy to control pouring consistency.

Using Serrated Wrack with Rhassoul Clay as a Hair Mask – Treating Damaged Hair and Detoxing the Scalp

Hydrate the clay powder with the seaweed extract, just increasing the quantities. Let the clay hydrate. Apply to the wet hair. Cover the hair so that the clay well does not dry out. If the clay does dry out it can be difficult to rinse out so do keep all of the hair covered. Leave the clay and seaweed mask on for 20 minutes and then rinse thoroughly.

You could finish with some of the seaweed extract used alone as a final extra conditioning rinse if you like.

Using Seaweed as a Natural Hair or Beard Conditioner

A well conditioned beard keep the beard grower’s neck scratch free and helps to prevent ingrown hairs. Well conditioned hair gives the appearance health and self worth and using seaweed reduces the electrostatic charge of the hair.

Make up the extract as above to condition the hair of the soften the beard. Wet a Sea Wool Sponge (the most absorbent sponge species) in water and squeeze it out. Then use the sponge to soak up to seaweed extract. Stroke the hair and scalp with the sponge and gently squeeze the sponge to to release the extract. Try not to let the extract get into the eyes as it is salty and that is why a sponge we recommend a sponge – it gives you more control over the liquid than anything else. Apply the seaweed infusion to the full length of the hair. Leave it for 5-20 minutes depending on your hair type and then give one quick rinse. Seaweed is an amazing natural hair conditioner.

Using Seaweed Oil with Henna To Detox and Deep Condition the Hair While Dyeing It

Sounds like a doubly good use of time! Make up the extract as above. Put it in a saucepan and heat it up. Add this with the boiled water to make up the henna. I have found that by the time the Moroccan henna is ready to apply as soon as it has cooled to the right temperature. Adjust the consistency before application, so that it forms a loose paste and henna as usual. However it won’t be ‘usual to your scalp or hair’ it will be great and you hair will feel remarkably soft, thick and conditioned.

How to Use Seaweed Extract on the Skin – Detox and Support Weight Loss, Tone, Nourish and Moisturize Skin

Make up the extract as above. Wet a Sea Wool Sponge (the most absorbant sponge species) in water and squeeze it out. Then use the sponge to soak up to seaweed extract and apply directly to the skin. You can leave it to absorb and reapply if needed for the duration of your bath. I always apply the seaweed extract to face,  neck, arms and breast area while I am in the bath. Be assured, it will be in my hair too!

Using Seaweed as a Compress on Aching Joints and Joints with Osteoarthritis

Dip some linen or muslin in the seaweed extract and wrap the joint. Heat the extract first if you find the heat beneficial too and wrap the compress with insulating textile such as wool or a scarf or water ever you have to hand. Relax for 20-25 minutes. Remove the wraps and rinse the skin to wash away any toxins.

The General Properties of Seaweed

Actions: Anti-bacterial, Anti-cholesterolaemic, Anti-hypothyroid, Antioxidant, Diuretic, Emollient, Endocrine Tonic, Expectorant, Immunoactive – Immunomodulatory, Nutritive

Detox Abilities of Seaweed

Detoxifies, cleans and moisturizes the skin.
Algin and natually chelated minerlas absorb radioactive toxins and heavy metals.
Detoxes dioxins (such as in vehicle exhaust) and polychlorinated biphenyl PCBs (toxins in electrical equipment and coolants). When people diet they release these toxins from the fatty tissues into the blood and lymph – so washing with clay and seaweed can help dieter.

Nutritive Qualities of Seaweed

Dense in minerals such as iodine, potassium, sodium, calcium, magnesium, zinc, copper, chloride, sulfur, phosphorous, vanadium, cobalt, manganese, selenium, bromine, iodine, arsenic and iron. Infact the fucus serratus species of seaweed, being classed as a ‘brown seaweed’ contains a greater density of these minerals than  seaweeds classed as ‘red’.
Rich in a diversity of trace elements.
High in hormones such as melatonin (gives a calming effect and important for good sleep patterns).
Very high in fucin or fucoidin which has anti-inflammatory qualities and it is used to promote rapid skin healing and healing after surgical trauma and it has exhibited anti-viral properties.
High in Vitamin C, E, D
Rich in Vitamins, especially B vitamins with high levels of B12 (needed by vegetarians)
Rich proteins and amino-acids

Skin Nurturing Aspects of Seaweed

Rich in minerals, trace elements, vitamins and amino acids for remineralization to support the entire skin and body.
Keeps the skin supple and elastic to reduce aging and increase comfort.
Significant amounts of fatty acid – mainly omega-3.
Copper, zinc, manganese, phosphorous and magnesium concentrated in seaweed are all vital to the synthesis of collagen and the connective tissues of the skin. All of the nutrients act directly on the basal layers of the skin promoting healthy skin growth and a firm tone.
Supports skins with dermatitis psoriasis, eczema and acne.
High in Anti-oxidants such as algal carotenoids and polyphenols to prevent cell damage and to reduce aging.
Anti-Cellulite agent

General Health Aspects of Using Seaweed

  • Contains a special pigment called fucoxanthin which helps to metabalize fat.
  • Rich in plant enzymes (especially with the use of our cold infusion method.) and metals. For the enzymes to work in our bodies they need one or more coenzymes in the form of metal cations. The seaweed provides these metals and therefore supports good enzyme function in the body.
  • Used against obesity partly due to the high levels of iodine. An under-active thyroid can lead to weight gain, fatigue, cold sensitivity, loss of hair.
  • Arthritis friendly.
  • High in iodine and thyroid hormone homologs, used to support the activity of the thyroid and pituitary gland.

The thyroids is essential for metabloism, good immune function. Iodine regulates estrogen production. That is why I like to apply it especially to the upper part of the body while bathing.

Iodine is used by the thyroid gland to create the hormones T3 and T4 which regulate the metabolism of every cell in the body. Seaweed gives us the natural and health giving Iodine 127 isotope which protects against the harmful Iodine isotope 131 of the nuclear industry.

The idea is to give the thyroid natural iodine and then it will not need to take up harmful iodine. Seaweed gives us the only plant based form of thyroid hormone, all other sources are from animals. Fucus species of seedweed was historically harvested for its iodine content to treat goiter.

How Our Seaweed is Collected and Processed

We do not supply seaweed which has been washed up on the beach. These are dead fronds and they are already rotting, giving off the unpleasant and noxious hydrogen sulphide. They are not safe to use and the gas is toxic.

Our seaweed is collected by a skilled gatherer from healthy living plants when the tide is well out. The plants expect to have some of their frond either removed by currents or eaten by animals, so even with gathering, they will regrow their fronds. It is a dangerous and hard activity and the collector is brave and strong because wet seaweed is heavy and the surface is very slippery!

In fact nowadays, we collect much less seaweed than we did in the past. This proves the sustainability of seaweed harvesting if collection levels were to increase. The seaweed is washed in clean water and then hung to air dry.


Dried serrated wrack (Fucus serratus)

50g for £5.00
100g for £10
200g for £20


  • 100% British and naturally grown in clean authority tested waters
  • Gathered by hand (no mechanical extraction) byan experienced, skilled, daring and caring collector. He helps each plant to proliferate by only taking amounts which improve the vigour of the mother plant, so that the plant can regrow and flourish.
  • Air dried (not kilns). Supplied dry to reduce the environmental cost of transport and to preserve the keeping qualities.
  • Supplied in its unprocessed form other than air drying (no factories). It is just hung in the breeze.
  • Traditional tried and tested use on the hair and body in Britain for hundreds of years.
  • Proven sustainability.
  • Many uses and secondary uses and biodegrades nicely (add to compost heap after use).
  • Supplied either in biodegradable cellophane packaging or brown paper bags, also fully biodegradable in a biodegradable envelope.
  • Tested for quality and purity.
  • Seaweed hair conditioner, especially when made up at home from the dried fronds is probably the most deep acting, effective and most environmentally friendly hair conditioner available.


In the past seaweed was used to teat goitre, a condition caused by iodine insufficiency. So if you are already receiving medical treatment, ask your doctor before using seaweed. It also has blood thinning qualities, so ask your doctor is you are already on blood thinners.

Some people are also allergic to seaweed so conduct a patch test on the skin first.

5 reviews for Seaweed Hair Conditioner, skin and scalp detox and mineralization, detox bath

  1. Niki (verified owner)

    I bought this along with rhassoul clay to use on my horse’s mane and tail as I was fed up with the disgusting ingredients in commercial bought mane de-tangler. The results have been far beyond my expectation and he was given lots of compliments on his clean and healthy locks. And tonight I didn’t have much time so I just brushed some seaweed water through his mane and poured a small bucket down his tail and even that alone has made it lovely and tangle free. Im so chuffed!

  2. seona (verified owner)

    I agree with the reviewers above, it’s lovely stuff. I have extremely thick , long hair , so I was a bit wary about how the clay and seaweed would turn out, I needn’t have worried , my hair feels great , was not tangled at all, soft and easy to comb. It also feels great on my skin as a rinse . Lovely.

  3. Lakshmi

    A wonderful product. Added more body to my hair when used as a rinse. I especially loved its effect on my skin – soft and silky, no need for moisturiser

  4. Mir (verified owner)

    I started using the seaweed about 2 months ago and my very dry and thick hair is now beautifully shiny and soft! Because of the dryness of it I don’t want to wash my hair too often and the rassoul clay and seeweed extract mixture makes that possible – my hair stays clean for almost a week.

  5. Marj A (verified owner)

    Loving the seaweed in my bath and made up with clay to wash my hair ,lots of comments about how nice my hair looks and people just want to feel it before I have told them what I washed it with , feeling clean .

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