Why Seaweed Is the Smarter, Safer Way to Support Iodine Sufficiency

Iodine deficiency is rising again across Europe, especially in the UK. Most people unknowingly rely on dairy, fish and iodised salt for their iodine intake — but modern diets contain less of all three. Seagreens® wild Wrack seaweed provides iodine in a natural, moderated, foodbased form that is absorbed gradually and safely. It also contains selenium, tyrosine, polyphenols and prebiotic fibres that support thyroid function and overall wellbeing. For known iodine insufficiency, Seagreens® Iodine+ offers a shortterm boost before switching to Food Capsules for longterm daily nutrition.

Why Seaweed Is the Smarter, Safer Way to Support Iodine Sufficiency

Iodine deficiency has quietly become one of the most widespread nutritional problems in Europe. Despite living in an age of abundant food, more than half of Europeans still fail to meet the recommended daily intake of iodine, and UK data shows particularly low levels among women, teenagers and pregnant mothers (Vanderpump et al., 2011; Bath and Rayman, 2015). This matters because iodine is essential for thyroid hormones, which drive metabolism, growth, cognitive development and energy production.

The WHO’s European Iodine Status Reports (2020, 2022, 2023) show that over thirty percent of European countries remain iodineinsufficient. The 2023 UK dietary surveillance confirms low iodine intake: teenage girls remain the most iodinedeficient group, adult women still fall below recommended intake, and plantbased diets are associated with significantly lower iodine intake.

These reports emphasise that iodine deficiency persists despite iodised salt programmes, largely due to reduced salt intake and increased consumption of processed foods that do not use iodised salt.

Why iodine is so hard to get from modern diets

Iodine is one of the least available minerals in modern agricultural soils (Henderson, 2016). As a result, land plants contain very little, and most people unknowingly rely on dairy, fish and fortified salt for their intake. With changing dietary patterns — including reduced dairy consumption, more plantbased diets and lower use of iodised salt — iodine insufficiency is rising again.

Why Seagreens® Wrack seaweed is different

Wild Wrack seaweeds such as Ascophyllum nodosum and Fucus vesiculosus draw iodine directly from the ocean and bind it within their cellular structure. This creates a form of iodine that behaves very differently from synthetic potassium iodide (KI), the compound commonly used to fortify salt and found in most iodine tablets.

Synthetic KI is absorbed rapidly, causing a sharp spike in blood iodine levels that the body quickly eliminates (Cooper, 2001). This “peak and crash” pattern can stress the thyroid and does not provide the steady supply needed for hormone production.

In contrast, a University of Glasgow study showed that iodine from Seagreens® Wrack seaweed is absorbed gradually, raising levels slowly and maintaining them over time (Combet et al., 2014). Participants with both low and normal iodine status reached a healthy equilibrium — a pattern far closer to how the body prefers to receive nutrients.

Stable, foodbased iodine delivery

Recent research strengthens this case. A 2024 Portuguese cohort study found that both low and excessively high iodine intake were associated with reduced cognitive scores in schoolaged children, highlighting the importance of stable, foodbased iodine delivery (Carvalho et al., 2024).

A 2025 review in Marine Drugs noted that iodine from whole seaweed is accompanied by natural cofactors — including selenium, tyrosine, polyphenols and prebiotic fibres — which may support thyroid hormone synthesis and antioxidant protection (Cadar et al., 2025). These cofactors are absent from synthetic iodine supplements.

More than iodine: the broader nutritional advantage

Seagreens® Wrack species contain a full spectrum of minerals, trace elements, vitamins, antioxidants and soluble fibre. These nutrients support thyroid function, immune resilience, gut health and metabolic balance. Studies show that seaweed polysaccharides can modulate inflammation, improve gut microbiome diversity and support metabolic health — benefits that extend well beyond iodine alone (Olsthoorn et al., 2021; Trigo et al., 2023).

Safety: moderated absorption and rigorous testing

Concerns about iodine “overdose” from seaweed are often overstated. Multiple studies show that only thirty to eighty percent of seaweed iodine is bioavailable, meaning the body absorbs it gradually and excretes excess safely (DominguezGonzalez et al., 2017; Notario Barandiaran et al., 2024).

Seagreens® goes further. Every batch is tested for:

Arsenic Cadmium Lead Mercury Microbial contaminants Iodine content Full mineral profile

This ensures safety, consistency and suitability for daily use.

When to use Seagreens® Iodine+ and when to switch to Food Capsules

For known iodine insufficiency, Seagreens® Iodine+ Capsules provide a shortterm, higheriodine intervention. They are ideal for restoring iodine status over a period of around two months.

After sufficiency is restored, switching to Seagreens® Food Capsules is recommended because:

Iodine+ is designed for correction, not longterm daily use Food Capsules provide iodine in balance with the full spectrum of Wrack nutrients Daily wholefood iodine supports steady hormone production Food Capsules deliver moderated iodine suitable for all ages and longterm wellbeing

You would continue with Iodine+ only if a healthcare professional advised ongoing higher intake for a specific medical reason.

Conclusion

As iodine deficiency continues to rise, Seagreens® Wrack seaweed offers a simple, sustainable and foodbased way to restore sufficiency — supporting thyroid health, cognitive development and overall wellbeing in a way that aligns with how the human body is designed to receive nutrients.