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5 Best Spirulina Supplements to Improve Your Health in 2024

Spirulina is a type of blue-green algae that many consumers have used for its high content of proteins, vitamins, minerals, carotenoids, and antioxidants. This combination of nutrients is thought to provide various health benefits, including support for the immune system, reduced inflammation, and heart health.

We have analyzed and reviewed the best spirulina supplements on the market to provide a comprehensive list of some of the best spirulina brands. With the many choices available, it can be challenging to select the best spirulina supplement for you. Therefore, we developed a list to aid in the decision process. In addition, we have provided a list of our top 5 supplements.

Best spirulina supplement: a shortlist

  1. BulkSupplements.com — best spirulina powder
  2. Double Wood Supplements — best spirulina supplement with high antioxidant content
  3. NOW — best spirulina tablets
  4. Swanson — best spirulina brand
  5. Micro Ingredients — best spirulina tablets for those with food allergies

How we compiled our list of the best spirulina supplements

Without the FDA evaluating individual supplements, it can be difficult to know the best product for your needs. That is why we are transparent with our recommendations. We aim to select high-quality products based on the below criteria.

Price-to-value ratioQualityFormDosageTaste and texture
$6.89–23.49Use of third-party testing and current Good Manufacturing Practices (cGMP)Powders, capsules, and tablets1,000 mg to 3,000 mg dailyEasy to tolerate supplements are important for consistent use
  • Price-to-value ratio. Products have varying price points that can change the value per serving size.
  • Quality. We prioritize supplements subjected to independent lab testing to ensure the product is free of harmful substances.
  • Form. Various options in dosage form allow you to choose the supplement most convenient for you and your lifestyle.
  • Dosage. Selecting products with adequate dosages is important to experience their benefits.
  • Taste and texture. The tolerability of the supplement plays an important role in maintaining consistent use.

Best spirulina supplements: an overview

These products are available in a variety of different forms, and using the above criteria, we were able to identify our top 5 supplements on the market. However, it is advised that you talk to your doctor before starting any new supplement to ensure it is appropriate, given your medical history and current medications.

People with phenylketonuria (PKU) should avoid food and supplements that are high in phenylalanine. As these products can contain phenylalanine, people with PKU should consult their healthcare provider before using these supplements.

1. BulkSupplements.com — best spirulina powder

BulkSupplements.com Organic Spirulina Powder

BulkSupplements.com manufactures its organic spirulina in powder form, improving the ease of use for those who have difficulty swallowing pills.

This organic powder offers a product free from additives, gluten, soy, and dairy, making it an ideal option for those with allergies.

To ensure the highest quality of ingredients, BulkSupplements.com utilizes a third-party laboratory to evaluate its product and adheres to current Good Manufacturing Practices (cGMP). The brand's commitment to high-quality products places this powder at the top of our list.

BulkSupplements.com offers its organic spirulina powder in a variety of different sizes. A 100-gram bag costs $13.96. With a serving size of two-fifths of a tablespoon, containing 3,000 mg of spirulina per serving, a 100 g bag provides just over 33 servings.

2. Double Wood Supplements — best spirulina supplement with high antioxidant content

Double Wood Blue Spirulina

Double Wood Supplements has developed a standardized Blue Spirulina powder containing a 350 mg dose of phycocyanin in each serving. This larger content of phycocyanin gives the powder its blue color, separating it from other products that tend to be green.

The product is gluten, soy, and GMO-free. Blue spirulina powder is vegan-friendly and can be added to many different drinks and smoothie recipes.

By utilizing third-party laboratory testing in an ISO 17025-certified lab, Double Wood Supplements ensures its produce is pure and without contaminants. The certificate of analysis is present on the company's website for easy viewing.

Double Wood Supplements' 30 g bottle contains a month's supply, as the recommended dosage is 1 g daily.

The cost of a 30 g bottle is $19.95, which includes free shipping within the U.S.

3. NOW — best spirulina tablets

NOW Foods Certified Organic Spirulina

NOW manufactures its Certified Organic Spirulina tablets to contain 500 mg of Spirulina per tablet. These tablets are a vegan-friendly option for those following a vegan or vegetarian diet.

This product is manufactured in a facility certified to be in accordance with current GMP. The website states that the product is packaged and quality tested in the U.S., but does not provide specific information on the quality testing used.

The tablets may vary in color; however, this is natural and does not mean they vary in their contents.

The recommended dosage of NOW Certified Organic Spirulina is six tablets daily, which supplies 3,000 mg of spirulina. The product is available in 100 and 500-count bottles.

The smaller bottle provides a 16-day supply for $6.89, whereas the larger bottle provides 183 servings for $23.49.

4. Swanson — best spirulina brand

Swanson Certified Organic Spirulina

Swanson manufactures its Certified Organic Spirulina product, which contains the first organic spirulina to be USP-verified for purity and potency. Each tablet provides 500 mg of organic spirulina. This product is manufactured using non-GMO and vegan-friendly ingredients.

This product is manufactured in facilities that are compliant with current cGMP.

Swanson is confident in its high-quality products and offers a 100% money-back guarantee. If you are not completely satisfied with the product after 100 days, you can return it for a full refund.

This product is available in a 180-count bottle that can provide a 30-day supply when taken at the recommended dosage of two tablets three times a day.

The cost of a 30-day supply is $9.19, with additional savings when enrolled in their subscribe and save program.

5. Micro Ingredients — best spirulina tablets for food allergy users

Micro Ingredients Organic Spirulina

Micro Ingredients Organic Spirulina Supplements feature a non-GMO, vegan-friendly protein, vitamin, and mineral source. Each tablet contains 500 mg of USDA-certified organic spirulina without any fillers.

This non-GMO product is soy, dairy, gluten, and tree nut-free, making it a great option for those with such allergies. However, it does mention that it may contain shellfish products, so caution is still advised.

This vegan-friendly product is manufactured in the U.S. and is guaranteed to contain no preservatives, additives, artificial colors, or artificial flavors. The brand claims that the supplement undergoes third-party testing to ensure its purity and potency.

The recommended dosage for Micro Ingredients Organic Spirulina is six capsules daily, taken with 8 ounces of your favorite drink.

This supplement is provided in recyclable packaging containing 720 capsules. Therefore, each bag provides a 4-month supply for $23.36, which includes free shipping for Amazon Prime members.

Comparing the best spirulina supplements

BrandPricePrice per ServingServing sizeSpirulina per servingThird-party testing
BulkSupplements.com$13.96$0.422/5ths tablespoon daily3,000 mgYes (certificate can be requested)
Double Wood Supplements$19.95$0.673/4ths lightly packed scoop1,000 mgYes
NOW$6.89–23.49$0.13–0.436 tablets daily3,000 mgNo
Swanson$9.19$0.102 tablets three times a day1,000 mgNo
Micro Ingredients$23.36$0.196 tablets daily3,000 mgYes (though certificate not is available to view)

What is spirulina?

Spirulina is a blue-green algae found in salty, alkaline bodies of water. It continues to be a popular dietary supplement for its extraordinary nutritional qualities. Spirulina is one of the highest natural source of protein that has been discovered.

In addition to protein, spirulina contains several nutrients that have been suggested to help reduce cholesterol, inflammation, and oxidative stress levels. While more clinical trials are needed to confirm the health benefits, some smaller initial studies have shown some promising results.

Nutritional profile of spirulina

Spirulina is a nutrient-packed supplement and contains a wide variety of vitamins and minerals. One of the most impressive qualities of spirulina is its high protein content.

According to the U.S. Department of Agriculture, one tablespoon (approximately 7 g) contains 4.02 g of protein, amounting to 57.4% of its dry weight.

A tablespoon of spirulina provides the following nutrients:
2 mg
13.6 mg
8.26 mg
95.2 mg
73.5 mg
0.167 mg
0.257 mg
0.896 mg
6.58 µg
Vitamin A:
2.03 µg
Vitamin B6:
0.025 mg
Vitamin K:
1.78 µg

In addition, spirulina contains antioxidants such as phycocyanin, which is responsible for its blue-green pigment.

Available forms of spirulina supplements

When selecting a spirulina supplement, there are three dosage form options available from which you can pick. In addition, similar products like chlorella exist and can make finding a pure spirulina supplement more difficult. The three options for spirulina on the market include:

  • Powders. These are easier for those with difficulty swallowing pills and can be easily incorporated into your daily smoothie or protein drink.
  • Tablets. These products require no preparation to take the dosage and are more convenient to bring on the go.
  • Capsules. The best spirulina capsules provide a pre-measured, consistent dosage that is tasteless and avoids the distinct earthy and sometimes fishy taste that can be associated with powders and tablets.

Health benefits of spirulina

An increasing number of research studies support spirulina’s positive health benefits; however, many are small studies and require larger clinical trials to confirm results.

Heart health benefits

Clinical studies have shown spirulina taken daily was able to reduce levels of triglycerides and low density lipoprotein — LDL ("bad cholesterol") in healthy subjects and those with ischemic heart disease. These findings suggest that spirulina can be beneficial in helping reduce the risk of cardiovascular disease.

In addition, the anti-inflammatory and antioxidant properties of spirulina have been speculated to provide protection from inflammatory molecules and free radicals that play a role in the development of plaques within arteries. However, there are currently no studies evaluating this proposed benefit.

Allergies and immune system benefits

It is well understood that deficiencies in key nutrients and vitamins can have negative effects on the immune system. Therefore, nutritionally-dense spirulina supplements have been used to evaluate its effects on the immune system.

In a randomized clinical trial, daily spirulina supplementation showed a reduction in blood levels of key molecules thought to increase the likelihood of developing allergies. Additionally, another randomized clinical study in patients with allergic rhinitis showed a reduction in nasal discharge, sneezing, congestion, and itching compared to placebo.

Anticancer benefits

The effects of spirulina on the immune system and its antioxidant benefits have led many to investigate and hypothesize about its potential anticancer benefits.

While many of these claims are speculative, one study evaluated the effects of spirulina on an oral cancer called leukoplakia. After one year of use, 45% of patients receiving spirulina supplementation showed complete remission of the oral cancer.

This benefit is intriguing, only a few clinical studies have been conducted to determine the role of spirulina in cancer prevention and treatment. Therefore, more high quality clinical studies are necessary for further evaluation.

Helps regulate blood sugar

In a systematic review of the literature, spirulina was shown to help reduce fasting blood sugar levels and cholesterol levels in patients with Type II diabetes.

This suggests that the blue-green algae may be helpful in this population of patients; however, more clinical studies need to be conducted to better understand the effects of spirulina on blood sugar levels. Additionally, the dosage ranged from 0.8–8 g, and future studies are needed to clarify the most appropriate dosage for blood sugar control.

Side effects of taking spirulina supplements

Spirulina has been associated with side effects, including cramping, bloating, gassiness, diarrhea, dizziness, and vomiting. Allergic reactions can also occur and should be monitored when starting a new supplement. If any of these adverse effects are present, stop the supplement and contact your healthcare provider for further guidance.

It is not uncommon for spirulina to contain heavy metals if obtained from a contaminated body of water. Therefore, it is important to use supplements that have undergone third-party testing to reduce the risk of heavy metal contamination.

Tips for incorporating spirulina into your diet

The nutritional benefits of spirulina are significant as it contains a high amount of antioxidants and vitamins. When incorporating this supplement into your diet, try one of these easy-to-use ways to increase your spirulina intake.

  • If you are eating a yogurt, smoothie, or protein shake daily, add a scoop of spirulina powder.
  • Incorporating spirulina powder into your bread recipe can give you nutritionally packed green bread.
  • Mix spirulina powder into your salad dressing to enhance the nutritional benefits of your greens.
  • Have a sweet tooth? Incorporate spirulina into the recipe to make those sweet indulgences a more nutritious snack.

Best spirulina supplement: conclusion

Spirulina is a nutrient-rich blue-green algae that has been incorporated into diets for decades. While the health benefits still require additional scientific studies to prove, some research shows that it may be beneficial in reducing blood pressure, decreasing high cholesterol, regulating blood sugar, and helping boost the immune system.

However, the use of spirulina should not be used as a substitute for medical care. Speak to your healthcare provider before introducing a new supplement to your daily routine.

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