Spirulina is a vegan source of vitamin B12 – a vitamin some vegans and vegetarians may be lacking, as it’s mainly found in meat.3,4 It became popular after it was discovered that NASA gave it to astronauts on space missions as a food supplement.5
Research shows that spirulina could be helpful for lowering ‘bad’ cholesterol and high blood pressure. It may have anti-inflammatory properties, too.6,7,8
You can take spirulina in tablets, capsules or as a powder that can be added to shakes and smoothies for a nutritional boost. It’s also increasingly popular as an ingredient in snack, or energy, balls.
1. It could help lower ‘bad’ cholesterol
High cholesterol is a significant risk factor for heart disease – a major cause of death in the UK. But spirulina has shown some promise at reducing levels of LDL, or ‘bad’, cholesterol.In a 2018 meta-analysis of research, Chinese scientists reported that spirulina supplements had a ‘favourable effect’ on improving LDL cholesterol and triglyceride levels (a type of fat in the blood).10 Spirulina was also found to help reduce blood glucose levels – another risk factor for heart disease – which lead the team to conclude that spirulina could be considered in the ‘prevention and treatment of cardiovascular disease in humans’.11
2. It might reduce high blood pressure too
Likewise, spirulina could help lower blood pressure in people with type 2 diabetes.A 2008 study published in Nutrition Research and Practice found people with type 2 diabetes who took the blue-green algae every day for 12 weeks experienced a reduction in blood pressure. It seemed to be more effective if the patient’s triglyceride levels were high, too.12 Similar results were recorded by a 2016 trial of 40 overweight people who had high blood pressure. Volunteers who took spirulina for three months saw improvements in their blood pressure, body weight and BMI, while those taking a placebo saw no significant changes.13
3. Potential antioxidant and anti-inflammatory propertiesSpirulina is known to contain antioxidants, which help prevent our cells from damage caused by free radicals.14 This damage can cause long-term inflammation which may lead to conditions such as heart disease and high blood pressure,15 among others including dementia. Phycocyanin is one of the major antioxidant compounds in spirulina.16 It’s believed to fight free radicals and help prevent inflammation in the body.17,18
Make sure you follow any instructions or recommendations on the product label before taking. Talk to your GP or a trained dietician or nutritionist if you’re concerned.You should not take spirulina if you:20
If you are on any medication, check with your doctor that it is safe to take spirulina at the same time.
Stop taking spirulina if you experience any of the above and seek medical advice.Shop Superfood Supplements Advice is for information only and should not replace medical care. Please check with your GP before trying any remedies.
Sources1. Encyclopedia.com. Spirulina
2. As above3. Kamal Patel. examine.com. Spirulina 4. NHS. Vegetarian and vegan diets Q&A 5. Karkos PD, et al. Spirulina in Clinical Practice: Evidence-Based Human Applications 6. Huang H, et al. Quantifying the effects of spirulina supplementation on plasma lipid and glucose concentrations, body weight, and blood pressure 7. Lee E H, et al. A randomized study to establish the effects of spirulina in type 2 diabetes mellitus patients 8. Shih C M, et al. Anti-inflammatory and antihyperalgesic activity of C-phycocyanin
9. As Source 5
10. As Source 6
11. As Source 6
12. As Source 7
15. As above16. Joe Leech. Healthline. 10 health benefits of Spirulina
17. As Source 818. Reddy M C, et al. C-Phycocyanin, a selective cyclooxygenase-2 inhibitor, induces apoptosis in lipopolysaccharide-stimulated RAW 264.7 macrophages
19. As Source 3
20. As Source 1
21. As Source 1