Chlorella and spirulina are forms of algae that have been gaining popularity in the supplement world.
Both have impressive nutrient profiles and potential health benefits, such as lowering risk factors of heart disease and improving blood sugar management (
This article reviews the differences between chlorella and spirulina and assesses whether one is healthier.
Chlorella and spirulina are the most popular algae supplements on the market.
While both boast an impressive nutritional profile and similar health benefits, they have several differences.
Chlorella is higher in fat and calories
Chlorella and spirulina deliver a number of nutrients.
|Calories||115 calories||81 calories|
|Protein||16 grams||16 grams|
|Carbs||7 grams||7 grams|
|Fat||3 grams||2 grams|
|Vitamin A||287% of the Daily Value (DV)||3% of the DV|
|Riboflavin (B2)||71% of the DV||60% of the DV|
|Thiamine (B1)||32% of the DV||44% of the DV|
|Folate||7% of the DV||7% of the DV|
|Magnesium||22% of the DV||14% of the DV|
|Iron||202% of the DV||44% of the DV|
|Phosphorus||25% of the DV||3% of the DV|
|Zinc||133% of the DV||4% of the DV|
|Copper||0% of the DV||85% of the DV|
While their protein, carbohydrate, and fat compositions are very similar, their most notable nutritional differences lie in their calorie, vitamin, and mineral contents.
Chlorella is higher in:
- omega-3 fatty acids
- provitamin A
Spirulina is lower in calories but still contains a high amount of:
Chlorella contains higher levels of omega-3 fatty acids
Chlorella and spirulina contain similar amounts of fat, but the type of fat differs greatly.
Omega-3 and omega-6 fatty acids are essential polyunsaturated fats that are important for proper cell growth and brain function (8).
They’re considered essential because your body is unable to produce them. Therefore, you must obtain them from your diet (8).
Omega-3 fatty acids, in particular, are associated with numerous health benefits, including reduced inflammation, improved bone health, and a lower risk of heart disease and certain cancers (
However, you would need to consume very large amounts of these algae to meet your daily omega-3 needs. People typically only consume small portions of them (
Both forms of algae contain various types of polyunsaturated fats.
Though chlorella offers some omega-3 fats, concentrated algal oil supplements are a better option for those seeking alternatives to animal-based omega-3 supplements.
Both are high in antioxidants
In addition to their high levels of polyunsaturated fat, both chlorella and spirulina are very high in antioxidants.
These are compounds that interact with and neutralize free radicals in your body to prevent damage to cells and tissues (
In one study, 52 people who smoked cigarettes were supplemented with 6.3 grams of chlorella or a placebo for 6 weeks.
Participants who received the supplement experienced a 44% increase in blood levels of vitamin C and a 16% increase in levels of vitamin E. Both of these vitamins have antioxidant properties (
Furthermore, those who received a chlorella supplement also showed a significant decrease in DNA damage (
In another study, 30 people with chronic obstructive pulmonary disease (COPD) consumed either 1 or 2 grams of spirulina daily for 60 days.
Participants experienced up to a 20% increase in blood levels of the antioxidant enzyme superoxide dismutase, and up to a 29% increase in vitamin C levels. (
Spirulina may be higher in protein
Civilizations as far back as the Aztecs have used algae, such as spirulina and chlorella, as food (
Chlorella is rich in omega-3 fatty acids, vitamin A, riboflavin, iron, and zinc. Spirulina contains more thiamine, copper, and possibly more protein.
Numerous studies have shown that both chlorella and spirulina may benefit blood sugar management.
Insulin sensitivity is a measure of how well your cells respond to the hormone insulin, which shuttles glucose (blood sugar) out of the blood and into cells where it can be used for energy.
Furthermore, several human studies have found that taking chlorella supplements may increase blood sugar management and insulin sensitivity.
Some research shows that spirulina and chlorella may help lower blood sugar levels and increase insulin sensitivity.
Studies have shown that chlorella and spirulina have the potential to improve heart health by affecting your blood lipid composition and blood pressure levels.
In one controlled 4-week study, 63 participants who were given 5 grams of chlorella daily showed a 10% reduction in total triglycerides, compared with a placebo group (
Furthermore, those participants also experienced a 11% reduction in LDL (bad) cholesterol and a 4% increase in HDL (good) cholesterol (
In another study, people with high blood pressure who took chlorella supplements daily for 12 weeks had significantly lower blood pressure readings, compared with the placebo group (36).
Similarly to chlorella, spirulina may benefit your cholesterol profile and blood pressure.
A 3-month study in 52 people with high cholesterol found that taking 1 gram of spirulina per day lowered triglycerides by about 16% and LDL (bad) cholesterol by about 10% (
In another study, 36 participants with high blood pressure experienced a 6–8% reduction in blood pressure levels after taking 4.5 grams of spirulina per day for 6 weeks (
Studies have found that both chlorella and spirulina may help improve your cholesterol profile and reduce your blood pressure levels.
Both forms of algae contain high amounts of nutrients. However, chlorella is higher in omega-3 fatty acids, vitamin A, riboflavin, iron, magnesium, and zinc.
The high levels of polyunsaturated fats, antioxidants, and other vitamins present in chlorella give it a slight nutritional advantage over spirulina.
However, both offer their own unique benefits. One isn’t necessarily better than the other.
As with all supplements, it’s best to talk with your healthcare provider before taking spirulina or chlorella, especially in high doses.
What’s more, spirulina and chlorella may not be appropriate for people with certain autoimmune conditions.
If you have an autoimmune condition, speak with your doctor before adding chlorella or spirulina into your diet (40).
Additionally, consumers should only buy supplements from a reputable brand that has undergone third-party testing to ensure safety.
While both chlorella and spirulina are high in protein, nutrients and antioxidants, chlorella has a slight nutritional advantage over spirulina.
However, both are great choices.
Chlorella and spirulina are forms of algae that are highly nutritious and safe to eat for most people.
They’re associated with many health benefits, including lowered risk factors for heart disease and improved blood sugar management.
Though chlorella is slightly higher in some nutrients, you can’t go wrong with either.