A SUPPLEMENT derived from freshwater can reduce the risk of a ‘silent killer’ condition, say scientists.
Left untreated, the condition can increase the risk of and .
Edible algae, including spirulina, is recognised for its high nutritional value - high in protein, B vitamins, iron, and antioxidants like phycocyanin.
In a recent study published in the Journal of Human Nutrition and Dietetics , researchers investigated its effects on (BP).
They looked at existing studies on the effects of microalgae (for example spirulina and chlorella) on BP, as well as macroalgae (for example seaweeds such aswakameorkombu).
Most studies used edible algae as supplements, while others provided algae as tablets, pills, drinks, or powder.
Daily algae intake ranged between 0.001 g and 8 g per day.
Of the 19 studies they looked at, 19 reported reductions in systolic blood pressure (SBP - the pressure in your arteries when your heart muscle contracts and pumps blood out to your body) and diastolic blood pressure (DBP - the bottom number in a blood pressure reading, representing the pressure in your arteries when your heart is resting between beats).
Microalgae was found to drive the most benefits, while macroalgae showed no significant effects.
Whole algae reduced SBP (-3.96 mmHg) and DBP (-2.82 mmHg) significantly, whereas extracts/bioactive compounds did not.
Spirulinawas the most effective microalgae, reducing SBP by -5.28 mmHg and DBP by -3.56 mmHg.
Chlorella showed nonsignificant trends, and studies with algae dosage of more than 3g a day had a significant reduction in DBP (-3.05 mmHg) and SBP (-3.71 mmHg).
The authors cautioned excessive seaweed consumption, more than 5g a day, could pose heavy metal or iodine risks, so microalgae, such as spirulina are safer.
Overall, their results underscore the potential of whole edible microalgae as a natural, sustainable approach for BP management, complementary to existing pharmacological treatments.
Spirulina is commonly available inpowder and tablet and capsule forms.
One example is Cytoplan Organic Spirulina , which offers 120 capsules for £16.80 - making it 14p a capsule.
High blood pressure damages blood vessels, making them stiff or narrow, which can lead to blockages or ruptures that cause heart attacks and strokes.
The condition is often called the “silent killer”because it has no noticeable symptoms, meaning many people don’t realise they have it until serious complications arise.
Lifestyle factors, genetics, and underlying medical conditions can all cause it, particularly poor , lack of , and .
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