Seaweed and Cardiovascular Health: Why Seagreens® Support Heart Health

The cardiovascular system is your body’s transport network, made up of the heart, blood and blood vessels. It delivers oxygen and nutrients to every cell. It also removes waste products such as carbon dioxide and helps regulate important functions such as temperature, immunity and overall health.

Modern diets, often low in minerals and antioxidants, do not always give the cardiovascular system what it needs. Inflammation, oxidative stress, blood pressure, blood sugar and the condition of our blood vessels all play a part. This is where the brown wrack seaweeds used by Seagreens® can make a meaningful difference.

Seagreens ® products are made from three wild brown wrack species: Ascophyllum (Knotted Wrack), Fucus (Bladder Wrack) and Pelvetia (Channelled Wrack). These species have been studied and analysed for more than twenty five years, giving us a clear understanding of their nutrient profile and their benefits for human cardiovascular health.

Heart supportive minerals

Brown wrack seaweeds are naturally rich in minerals that support cardiovascular function, especially potassium and magnesium. Potassium helps balance sodium and maintain healthy blood pressure. Magnesium supports the relaxation of blood vessels and normal heart rhythm. These seaweeds also provide iodine, selenium and zinc, trace elements that support thyroid function and antioxidant defences, both of which influence cardiovascular health (Bath and Rayman, 2015).

Polyphenols and antioxidant protection

One of the most important features of brown wrack species is their polyphenol content. These include phlorotannins, compounds found only in brown seaweeds. They help calm inflammation and reduce oxidative stress, two major contributors to arterial stiffness and high blood pressure.

Research shows that brown wrack seaweed polyphenols can reduce inflammatory signalling and support healthier blood vessel function (Huang et al., 2021). Other studies have found that seaweed antioxidants help protect the delicate lining of blood vessels from oxidative damage (Wang et al., 2020).

Fucoidan and alginate

Brown wrack species contain fucoidan and alginate, two fibres with well documented cardiovascular benefits. Fucoidan has been shown to support healthy cholesterol levels, reduce vascular inflammation and provide gentle anticoagulant effects (Fitton et al., 2019; Shikov et al., 2021). Alginate slows the absorption of carbohydrates, helping to stabilise blood sugar, an important factor in long term heart health (Ishihara et al., 2019).

Blood pressure and vascular function

Blood pressure is another area where brown wrack seaweeds show promise. A 2020 clinical study found that brown seaweed polyphenols helped reduce systolic blood pressure and improve arterial elasticity in adults with elevated readings (Myers et al., 2020). These benefits appear to come from improved nitric oxide availability, the molecule that helps blood vessels relax, and reduced oxidative stress. Laboratory studies also show that fucoidan can directly enhance nitric oxide production in endothelial cells (Zhang et al., 2022).

Natural salt reduction

A simple way Seagreens supports cardiovascular health is by helping people reduce their salt intake without losing flavour. Excess sodium is one of the strongest dietary drivers of high blood pressure. Seaweed offers a naturally savoury, mineral rich alternative. Its natural balance of potassium, magnesium and trace minerals enhances flavour while lowering overall sodium exposure.

Research from Sheffield Hallam University showed that replacing half the salt in bread with Seagreens Ascophyllum maintained taste and texture while significantly reducing sodium content (Fairclough, 2010). More recent studies confirm that seaweed-based seasonings can reduce sodium intake, improve antioxidant capacity and support healthier blood pressure profiles (Kim et al., 2024).

For everyday cooking, Seagreens The Mineral Salt provides an easy way to reduce sodium while adding valuable minerals.

The gut heart connection

The prebiotic fibres in brown wrack species add another layer of support. By feeding beneficial gut bacteria, these fibres increase short chain fatty acids, which help regulate inflammation, cholesterol metabolism and insulin sensitivity. The connection between gut health and cardiovascular health is now well established, and brown wrack seaweeds fit naturally into this picture.

Daily use for cardiovascular resilience

Because Seagreens uses whole, wild brown wrack species, their minerals, fibres and polyphenols work together in a balanced, synergistic way. This makes them a gentle, sustainable addition to everyday meals.

Small daily amounts of Seagreens Culinary Ingredient or Food Capsules offer a simple way to support blood pressure, vascular health and overall cardiovascular resilience. For salt reduction, Seagreens The Mineral Salt can be used in place of ordinary salt for seasoning or cooking.

Seagreens® remains the only seaweed produced exclusively for evidence based human nutrition, with consistent composition and traceability across all products.