Spirulina Algae: A Superfood That's Out of This World

Discover the many health benefits of spirulina algae, from its high protein content to its potent antioxidant and anti-inflammatory properties. Learn how this nutrient-dense superfood has been used by NASA to feed astronauts and how to easily incorporate it into your diet for optimal health.

Spirulina Algae: A Superfood That's Out of This World
Close-up of spirulina algae, a nutrient-dense superfood with a long history of use and many health benefits. Image by Anaïs CROUZET from Pixabay

Spirulina algae has come a long way from its humble origins as "stone excrement" harvested by the Mexicas in pre-Hispanic times. Today, this bluish-green microscopic algae is considered a superfood, packed with nutrients that make it one of the most valued food supplements in the world. From its impressive protein content to its abundance of vitamins, minerals, and photochemicals, spirulina algae is a nutritional powerhouse that's hard to beat.

What is Spirulina Algae?

Spirulina algae is a type of cyanobacteria, or blue-green algae, that grows naturally in alkaline lakes, ponds, and rivers in tropical and subtropical regions. It has a spiral-shaped, filamentous structure and is usually blue-green in color, although it can also appear reddish-brown or yellow-green depending on the conditions in which it grows. Spirulina algae is a photosynthetic organism, which means it uses sunlight to convert carbon dioxide and water into energy, releasing oxygen as a byproduct.

Spirulina algae has been used for centuries as a food source by various cultures around the world. The Aztecs harvested it in the surroundings of Lake Texcoco to make a paste that the Spaniards called "earth cheese". Today, spirulina is cultivated on a commercial scale and is used in a variety of forms, including powders, capsules, tablets, and energy bars.

The Nutritional Value of Spirulina Algae

Spirulina algae is one of the most nutrient-dense foods on the planet. It is particularly rich in protein, containing up to 70% protein by weight. This makes it an excellent source of plant-based protein for vegetarians and vegans, as well as anyone looking to reduce their meat consumption.

What sets spirulina apart from other sources of protein is its digestibility. Unlike red meat, which can be hard on the digestive system, spirulina is highly digestible, meaning your body can absorb and utilize its protein more efficiently. This makes it an ideal food for athletes, bodybuilders, and anyone looking to build or maintain muscle mass.

In addition to its protein content, spirulina is also rich in vitamins and minerals. It contains high levels of vitamin B12, which is essential for healthy nerve function and red blood cell production, as well as iron, which is important for healthy blood and energy levels. Spirulina also contains significant amounts of magnesium, potassium, and calcium, which are all essential minerals for overall health.

Another unique feature of spirulina is its high concentration of photochemicals, or plant-based compounds that have antioxidant and anti-inflammatory properties. These include phycocyanin, chlorophyll, and beta-carotene, which are all believed to contribute to the health benefits of spirulina.

The Benefits of Spirulina Algae

Given its impressive nutritional profile, it's not surprising that spirulina has been linked to a variety of health benefits. Some of the most notable include:

  • Boosting Immune Function: Spirulina has been shown to enhance immune function, helping the body fight off infections and diseases.
  • Improving Athletic Performance: Spirulina has been shown to increase endurance and reduce muscle damage and inflammation in athletes, making it a popular supplement in the sports world.
  • Lowering Cholesterol: Studies have found that spirulina can lower cholesterol levels, particularly LDL ("bad") cholesterol, which is a major risk factor for heart disease.
  • Reducing Blood Pressure: Spirulina has also been shown to lower blood pressure levels, which can help reduce the risk of heart disease and stroke.
  • Fighting Oxidative Stress: The photochemicals in spirulina have potent antioxidant and anti-inflammatory properties, which can help protect the body against oxidative stress and chronic inflammation. These conditions are linked to a range of health problems, including cancer, diabetes, and neurodegenerative diseases.

Spirulina Algae and Space Travel

Spirulina's impressive nutritional profile has made it a popular food supplement not just on Earth, but also in space. NASA has been using spirulina to feed astronauts on space missions since the 1970s, as it provides a compact and nutrient-dense source of food that is easy to store and transport.

Spirulina's ability to produce oxygen through photosynthesis is also a valuable feature in space, where oxygen is in short supply. In addition, spirulina's high levels of protein and other nutrients can help counteract the muscle and bone loss that can occur during prolonged space travel.

How to Incorporate Spirulina Algae into Your Diet

If you're looking to reap the health benefits of spirulina, there are a variety of ways to incorporate it into your diet. Spirulina is available in powder, capsule, tablet, and energy bar form, and can be easily added to smoothies, juices, or other recipes.

One of the most popular ways to consume spirulina is by adding it to a green smoothie. Simply blend together a handful of spinach or kale, a banana, some almond milk, and a teaspoon or two of spirulina powder for a nutrient-packed breakfast or snack.

You can also add spirulina powder to your favorite recipes, such as soups, stews, or sauces, for an extra boost of nutrition. Capsules and tablets are also available for those who prefer a more convenient and easy-to-digest option.


Spirulina algae may have started out as "stone excrement", but it has since become one of the most valued food supplements in the world. Packed with protein, vitamins, minerals, and photochemicals, spirulina is a nutritional powerhouse that can boost immune function, improve athletic performance, lower cholesterol and blood pressure, and fight oxidative stress and chronic inflammation.

Whether you're an athlete, a health-conscious individual, or an astronaut, spirulina algae is a superfood that's worth incorporating into your diet. With its versatility and nutrient density, spirulina can help you feel and perform at your best, both on Earth and beyond.