Chlorella vs Spirulina: Superfood Face-Off for Better Health

Chlorella and spirulina are popular health supplements that may contribute to longevity by reducing oxidative stress while providing numerous benefits. But which one is healthier? Let’s examine the benefits of these nutrient dense superfoods, and discover which one might be the best for you.

Chlorella vs spirulina: are they different?

Chlorella and spirulina are both types of algae — also known as cyanobacteria — that contain vital nutrients for the human body. While they both have highly impressive nutrient profiles, there are some key differences between these two superfoods.


Chlorella contains more nutrients

Chlorella has a more robust nutrient profile in comparison to spirulina. The table below shows their different nutrient contributions.

A ½ ounce (14 gram) serving contains:

Calories57 calories40 calories
Protein8 grams8 grams
Carbs3.5 grams3.5 grams
Fat1.5 grams1 gram
Vitamin A143% of the Daily Value (DV)1.5% of the DV
Riboflavin (B2)35% of the DV30% of the DV
Thiamine (B1)16% of the DV22% of the DV
Folate3.5% of the DV3.5% of the DV
Magnesium11% of the DV7% of the DV
Iron101% of the DV22% of the DV
Zinc 66% of the DV2% of the DV
Copper 0% of the DV42% of the DV
Phosphorus12% of the DV1.5% of the DV

Spirulina may contain more protein

Both spirulina and chlorella contain high amounts of protein. However, recent studies have found that there are certain strains of spirulina which could contain as much as 10% more protein than chlorella.

The full spectrum essential amino acid profile of both chlorella and spirulina means that the body can use the protein effectively. Spirulina was even utilized by the Aztecs as a food source as far back as 1300 AD.

Chlorella has higher Omega 3s


Omega 3 fatty acids are essential for all over wellness and optimal functioning. They are especially regarded for their anti-inflammatory and brain functioning properties. The omega 3 fatty acid contents of chlorella are higher than spirulina, giving it an edge over the competition. However, you would need to eat a lot of chlorella to get a material amount of omega 3 compared with other sources like chia seeds, walnuts, and salmon.

Chlorella is harder to produce than spirulina

Chlorella requires additional processing in order to be metabolized by the human body. It has a tough cell wall that needs to be pulverized to enable digestion. You may notice that on many chlorella supplements you’ll see the words, “cracked cell-wall”, or “open cell”.

If the cell wall remains indigestible, chlorella can be dangerous as it increases sensitivity to light. In Japan in the 1970s, chlorella had a massive boom that was abruptly ended because of its capacity to increase photosensitivity after ingestion. Consumers were reporting skin blisters after exposure to direct sunlight. Thankfully, chlorella on the market today is safe — having been through the cell wall cracking process in order to be sold.

How are chlorella and spirulina similar?

Both types are a form of algae that thrive in warm, nutrient rich aquatic environments. Chlorella is a green algae and freshwater native, while spirulina is a blue-green algae, sometimes referred to as the superfood of the sea — growing in both fresh and saltwater. They are both prebiotics and provide nutrients that the healthy bacteria in your gut microbiome can feed on. Consumption of one or both types has numerous health benefits.

Blood sugar control

Both may help with maintaining healthy blood glucose levels. There have been numerous human and animal studies which show promising results for blood sugar management.

The exact mechanisms for this are still largely unknown, however it’s suspected that taking spirulina and chlorella supplements may increase insulin sensitivity. The promising study results may have implications for those with insulin resistance that can potentially lead to type 2 diabetes and metabolic syndrome.

Heart health


Both chlorella and spirulina affect blood lipid composition and blood pressure. This gives them the potential ability to improve your heart health. They contain heart healthy polyunsaturated fats which help reduce bad cholesterol and trigliceride levels in your blood — lowering the risk of heart disease and stroke.

Detoxifying ability

Oxidative stress has been related to cardiovascular disease, cancer, and other chronic diseases. Both spirulina and chlorella are high in antioxidants which have been shown to assist in healthy aging and help in the fight against chronic diseases.

There is some evidence that implies chlorella and spirulina have the ability to reduce heavy metal toxicity in the liver, kidneys and brain. Too much metal in our bodies — from polluted air or toxic work environments like mines and chemical factories — can be poisonous. Chlorella and spirulina may have the ability to bind to toxins and remove them as waste products in a process called chelation. This process may assist with the removal of heavy metals and other toxins from your bloodstream.

Which one should you choose?

The Chlorella vs. Spirulina debate can make it hard to decide which one is right for you. Because of the similar price point of both superfoods, you need to focus on the nutrient profiles and decide from there. Chlorella contains higher amounts of essential nutrients — especially vitamin A (as ß-carotene), iron, and zinc.

If you know your diet is low in essential nutrients such as iron, then perhaps choosing chlorella would be more advantageous due to its superior source of iron. However, if you have a healthy, balanced and nutritious diet, then there’s no need for the extra supplementation and you’ll be fine with spirulina.

Are chlorella and spirulina different from chlorophyll?

Do you remember learning about chlorophyll in biology class? It’s the molecule and pigment found in plants and is responsible for giving them their bright green color. Its primary purpose is photosynthesis — turning sunlight into energy.

Chlorophyll is a type of phytonutrient — a class of plant-based compounds found in many fruits, vegetables and even edible flowers. Phytonutrients have numerous potential benefits to human health including:

  • Reducing inflammation
  • Fighting oxidative stress
  • Immune enhancing
  • Anti-aging

Both spirulina and chlorella contain chlorophyll, but chlorella — which is classified as a pure green algae — has a much higher amount. This means you’ll be getting more of the beneficial phytonutrient and its health-giving properties.

Can you use chlorella and spirulina together?

Yes, you can absolutely use chlorella and spirulina together. The synergy of their nutrients and actions are a perfect combination, and using them together can enhance the benefits of these two superfoods.

The benefits from chlorella and spirulina could be particularly helpful for those following a vegan, vegetarian or mostly plant-based diet.

Used as part of an antioxidant-rich, wholefoods diet, chlorella and spirulina supplements can increase your levels of immune-boosting vitamins — helping you to stay vital, healthy and energized.


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