Duckweed vs Spirulina

Duckweed VS Spirulina: Which Is The Best Protein Powder?

Duckweed and Spirulina are two plant varieties that offer abundant protein and numerous health benefits. These nutritious plant sources are packed with essential nutrients. In this article, we will explore the characteristics, advantages, and potential drawbacks of Duckweed and Spirulina, helping you decide which one is the ideal protein supplement for you.


A Summary Of Duckweed And Its Key Benefits

duckweed plant

Duckweed, a small aquatic plant, grows in many parts of the world. It is protein- and nutrient-rich, including vitamins, minerals, and antioxidants. [1]

Duckweed is historically utilized for mitigating symptoms of colds and fevers. Additionally, traditions around the world used It to treat conditions such as urinary retention, painful urination, and urinary urgency. Furthermore, Duckweed has been applied topically to manage skin issues, including pimples and various skin ailments [2].

Currently, the number of people using Duckweed is increasing. Furthermore, the taste of raw Duckweed is a bit spicy and smelly compared to what most people can be comfortable with. So nowadays many Duckweed shakes combine Duckweed with fruits, vegetables, yogurt, and more to increase users' appetites.

What's About Spirulina And Its Key Benefits

Spirulina, a form of blue-green algae, stands out for its rich nutritional composition and antioxidant content. [3]

This superfood offers various health benefits, including the potential to reduce blood pressure, lower elevated cholesterol levels [4], regulate blood sugar [5], and contribute to promoting oral health [6]. The combination of its nutrient density and antioxidant properties makes Spirulina a valuable addition to a healthy lifestyle.

Spirulina is very high in protein and vitamins, along with other nutrients and antioxidants that are especially beneficial for the brain. All of the above makes Spirulina a perfect food for all diets, especially for vegetarians.

The Similarities Between Duckweed And Spirulina

Spirulina is rich in protein vitamins and minerals

Duckweed and Spirulina are excellent plant-based protein sources offering a sustainable and nutritionally rich profile. These attributes make them an ideal option for individuals seeking alternative protein sources, especially those adhering to a vegetarian or vegan diet.

Duckweed and Spirulina possess remarkable versatility and environmentally friendly characteristics, enabling them to be utilized in various ways. One can elevate the flavor profile by incorporating Duckweed and Spirulina into fruit combinations. Their adaptability knows no bounds!

Duckweed Vs Spirulina: The Comparison

Protein Content

Duckweed protein content: According to available studies, the amount of protein in Duckweed is about 30% to 50%. [7], [8], [9]

Spirulina protein content: According to available studies, the amount of protein in Spirulina is about 60% to 70%. [10]

Protein content may vary between brands and preparation methods of Spirulina and Duckweed. However, both provide protein and nutrients for humans.

Amino Acid Profile

Certain types of Duckweed boast elevated protein levels, furnishing all essential amino acids. Furthermore, Duckweed encompasses a spectrum of carbohydrates—such as starch, cellulose, hemicellulose, and pectin—providing both functional and nutritional attributes.

Additionally, Duckweed stands out for its abundant minerals, vitamins, and phytochemicals, notably lutein and β-carotene, which have been linked to a decreased risk of numerous chronic diseases. [7]

Spirulina contains high levels of protein, essential amino acids, vitamins, beta-carotene and pigments, minerals, essential fatty acids, and polysaccharides. [11]

Spirulina supplies vital lipids, including gamma-linolenic oleic acid, and exhibits low levels of nucleic acids. Notably, it stands out for its remarkable vitamin B12, beta-carotene, iron, calcium, and phosphorus content.

Moreover, Spirulina demonstrates favorable organoleptic properties, enhancing its potential as a promising food or nutritional supplement. Importantly, it boasts a safety profile with no observed acute or chronic toxicity, establishing it as a safe option for human consumption. [12]

Key Benefits

As mentioned above, Duckweed possesses an intense flavor and cooling properties. It is known for its ability to alleviate dryness, reduce heat, promote diuresis, nourish the blood, resolve phlegm, dispel wind, and detoxify the body.

Consequently, Duckweed has been traditionally utilized in medicinal preparations to address conditions such as fever, excessive sweating, and urinary tract disorders (including urinary retention, urgency, and painful urination) and to aid in healing bleeding wounds. [2]

Spirulina is considered a herb with effective antioxidant and anti-inflammatory properties. [3] In addition, it also prevents cancer [6], reduces the risk of allergic rhinitis [14], helps prevent anemia [15], and helps control blood sugar levels [5]. Besides, Spirulina also contains many other nutrients, such as antioxidants, that are very beneficial for the brain.

Digestibility And Tolerance For Human

there is no side effects of duckweed and spiruline digestibility

Duckweed protein powder is characterized by its easy digestibility due to its high protein quality. Minimal processing of Duckweed during flour production helps preserve natural nutrients, enzymes and bioactive compounds.

Keeping these essential elements contributes to the overall digestibility of duckweed protein powder and supports its potential benefit in providing easily absorbed nutrients to the body.

Spirulina protein powder contains a unique protein called phycocyanin, which has been shown to have anti-inflammatory and antioxidant properties. [13] This particular protein contributes to the overall health benefits associated with Spirulina.

Furthermore, the protein in Spirulina is recognized as highly digestible, ensuring that the body absorbs nutrients effectively. This combination of unique proteins and digestibility enhances the nutritional value of spirulina protein powder.

Duckweed protein powder exhibits a lower bioavailability than Spirulina. This is attributed to the higher fiber content and other compounds within duckweed protein powder that may impede the absorption of nutrients by the body.

While duckweed protein powder still imparts essential nutrients, its absorption and utilization by the body may not be as efficient as that of spirulina protein powder.

Owing to its distinctive cellular composition, the protein in spirulina powder boasts high bioavailability, facilitating the effective absorption of its nutrients. This implies that the body can readily access and utilize Spirulina's protein, vitamins, and minerals.

Side Effects

Duckweed is a plant that contains relatively high levels of calcium oxalate. This substance has the potential to contribute to the formation of kidney stones. In addition, Duckweed can accumulate toxins from the water where it grows.

Therefore, caution should be exercised, and harvesting should not be done from heavily polluted water sources. [2]

Up to now, there are still no side effects that are considered significant when using Spirulina. Therefore, you can feel secure when using this herb. [13]

Duckweed Vs Spirulina: Which Is The Best Protein Powder?

Determining the "best" protein powder between Duckweed and Spirulina depends on individual preferences, dietary needs, and health goals. Both plants offer a range of health benefits and nutrients, making them suitable for various individuals. Some may prefer the taste of Duckweed or Spirulina in their fruit combinations, while others may prioritize specific nutrients such as protein or vitamins.

You can consider the advantages of each type:

  • Duckweed is high in protein and contains essential amino acids. High fiber content, providing fiber, supporting digestion, and prolonging the feeling of fullness. Contains many minerals and vitamins, such as potassium, iron, and vitamin A.
  • Spirulina is a good source of protein, providing nutrients such as vitamin B12, iron, and beta-carotene. Able to remove pollutants from the body. Spirulina powder is usually easy to use and dissolves well in water or drinks.

You can choose from these two types depending on:

  • Health Goals: Duckweed may be a suitable choice if you need a high protein content and want to support digestion.
  • Convenience and Taste: Spirulina might be a better fit if you prefer a convenient option with a less objectionable taste.

Can We Combine Duckweed And Spirulina Together?

Yes, combining Duckweed and Spirulina together in a protein powder blend is possible. This combination can provide a balanced profile of essential amino acids, vitamins, minerals, and beneficial compounds. It also allows for a more diverse range of nutrients and flavors in the diet.

Benefits of Combining Duckweed and Spirulina:

  • Synergistic Nutrient Profile: Duckweed and Spirulina possess distinct nutrient compositions. By combining them, you can achieve a more balanced and comprehensive nutrient profile, ensuring a wider range of essential nutrients.
  • Enhanced Protein Quality: Duckweed and Spirulina are abundant in protein, and their combination can improve the overall protein quality. This can be particularly advantageous for individuals seeking a well-rounded protein source that encompasses all essential amino acids.


Are There Any Concerns About Combining Duckweed And Spirulina?

Consider your body's reaction when using a combination of these two herbs. You should start with smaller amounts and monitor your body's response to the combination. The ratio of Duckweed and Spirulina can be adjusted based on personal preferences and nutritional goals.

What Are Some Creative Ways To Use Duckweed And Spirulina Besides Shakes?

You can incorporate Duckweed and Spirulina into your diet more creatively by trying the following: making nutritious smoothie bowls by blending Duckweed or Spirulina with frozen fruits, yogurt, and your favorite toppings like nuts, seeds, and fresh fruits, sprinkling dried Duckweed or spirulina powder into salads for an extra nutritional boost, mix Spirulina into creamy soups or stews to add nutrients and more.

Is It Okay To Consume Duckweed And Spirulina Every Day?

Until now, there has yet to be much proof that consuming these two herbs will have harmful effects. Consuming Duckweed and Spirulina daily can be part of many people's healthy and balanced diet. However, it is important to consider several factors: individual tolerability, Dosage Instructions, etc.


In summary, Duckweed and Spirulina are excellent protein sources offering many health benefits. They boast easy digestibility, high nutritional value, and versatility in different diets. While each has its distinctive nutrient profile, combining them in a protein powder blend can enhance the provision of a comprehensive range of essential nutrients.


[1] Duckweed (Lemnaceae) for potentially nutritious human food: A review. (2023). Food Reviews International.
[2] Ali Esmail Al-Snafi. (2019, August 9). Lemna minor: Traditional Uses, Chemical Constituents and Pharmacological Effects-A Review. ResearchGate; unknown.
[3] Han, P., Li, J., Zhong, H., Xie, J., Zhang, P.-D., Lu, Q., Li, J., Xu, P., Chen, P., Leng, L., & Zhou, W. (2021). Anti-oxidation properties and therapeutic potentials of spirulina. Algal Research, 55, 102240–102240.
[4] Nakaya N, Homma Y, & Goto Y. (2023). Cholesterol lowering effect of spirulina. Nutrition Reports International, 37.
[5] Hatami, E., Samira Sadat Ghalishourani, Ameneh Najafgholizadeh, Makan Pourmasoumi, Hadi, A., Clark, Mostafa Assaroudi, Ammar Salehi‐Sahlabadi, Farahnaz Joukar, & Fariborz Mansour-Ghanaei. (2021). The effect of spirulina on type 2 diabetes: a systematic review and meta-analysis. PubMed Central, 20(1), 883–892.
[6] Evaluation of chemoprevention of oral cancer with spirulina fusiformis. (2024). Taylor & Francis.
[7] Duckweed (Lemnaceae) for potentially nutritious human food: A review. (2023). Food Reviews International.
[8] Roman, B., Brennan, R. A., & Lambert, J. D. (2021). Duckweed protein supports the growth and organ development of mice: A feeding study comparison to conventional casein protein. Journal of Food Science, 86(3), 1097–1104.
[9] Casal, J., Vermaat, J. E., & Wiegman, F. (2000). A test of two methods for plant protein determination using duckweed. Aquatic Botany, 67(1), 61–67.
[10] Sadeghi, S., Jalili, H., Ranaei Siadat, S. O, & Sedighi, M. (2018). Anticancer and Antibacterial Properties in Peptide Fractions from Hydrolyzed Spirulina Protein. Journal of Agricultural Science and Technology, 20(4), 673–683.
[11] Europe PMC. (2016). Europe PMC.
[12] Belay, A., Ota, Y., Miyakawa, K., & Hidenori Shimamatsu. (1993). Current knowledge on potential health benefits of Spirulina. Journal of Applied Phycology, 5(2), 235–241.
[13] Karkos, P. D., Leong, S., Karkos, C. D., N. Sivaji, & D. Assimakopoulos. (2011). Spirulinain Clinical Practice: Evidence-Based Human Applications. Evidence-Based Complementary and Alternative Medicine, 2011, 1–4.
[14] Cemal Cingi, Meltem Conk Dalay, Hamdi Çaklı, & Bal, C. (2008). The effects of spirulina on allergic rhinitis. European Archives of Oto-Rhino-Laryngology, 265(10), 1219–1223.
[15] Selmi, C., Patrick S.C. Leung, Fischer, L. K., German, B., Chen Yen Yang, Kenny, T. P., Cysewski, G. R., & M. Eric Gershwin. (2011). The effects of Spirulina on anemia and immune function in senior citizens. Cellular & Molecular Immunology, 8(3), 248–254.
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Ralph S. Albert, with over 10 years of expertise in nutrition and research, now heads the Research division at Vinatura Supplements. His dedication and extensive knowledge ensure top-quality articles on nutrition and health, collaborating with a skilled team. He has successfully completed The VINATURA Expertise Research Training Program, underscoring his commitment to Vinatura's mission. Ralph has also published numerous articles and conducted valuable research in the field, making him a trusted resource for individuals on their wellness journey.

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