Health Benefits of Blue Green Algae

by Dr. Edward Group DC, NP, DACBN, DCBCN, DABFM Published on , Last Updated on

Blue Green Algae

Organic blue-green algae is one of the most nutrient dense foods on the planet. Two varieties, spirulina and Aphanizomenon flos-aquae, are the most consumed forms of blue green algae; which has superfood status due to high concentrations of proteins, vitamins and nutrients. [1]

How is Blue-Green Algae Cultivated?

Most blue-green algae products contain Aphanizomenon flos-aquae harvested from Upper Klamath Lake in southern Oregon. Harvesting is done during the summertime, June to November. The algae is filtered to preserve the most vibrant blooms and then further purified by centrifugation. The AFA is then chilled and sold frozen or dried at low temperatures and sold as a powder.

Natural Compounds in Organic Blue-Green Algae

Blue-green algae is 70% vegetable protein and has higher levels of beta-carotene than broccoli. The one-two punch potency of blue-green algae is that it contains a high concentration of nutrients- over 65 vitamins, minerals and enzymes and the complete spectrum of eight essential amino acids and ten nonessential amino acids… and they are all easily absorbed by the body. In fact up to 97% of the beneficial vitamins, minerals and enzymes found in blue-green algae are easily absorbed (some supplements are as low as 5-25% absorbable). AFA also contains the most biologically active chlorophyll of any known food.

Antioxidant Activity of Blue-Green Algae

Aphanizomenon flos-aquae is rich in compounds that provide antioxidants. A measurement called the “oxygen radical absorbance capacity” (ORAC) is used to determine free radical scavenging capacity of foods and other substances purported to contain antioxidants. Italy’s University of Urbino Carlo Bo applied the ORAC method to edible AFA. The outcome was positive in favor of researchers supporting the use of AFA as a dietary antioxidant supplement to relieve oxidative stress. [2]

The University of Urbino Carlo B conducted another study designed to evaluate the ability of AFA to provide defense against oxidative damage to normal human red blood cells and plasma. Results suggested AFA lowered oxidative damage in both. Furthermore, AFA delayed the depletion of enzymes that are beneficial to the body. [3]

A Japanese study found that a product containing blue-green algae from lake Klamath exhibited considerable antioxidant activity and was an effective adaptogenic; that is, a substance that helps the body adapt to protect against stressors. [4]

Blue-Green Algae and B12

There is some controversy over whether or not AFA is an effective source of vitamin B12. Many natural sources of vitamin B12 have been shown to be biologically inadequate. However, preliminary research conducted by Italy’s Department of Neurorehabilitation at Villa Salus Hospital evaluated the vitamin B12 levels of 15 vegan subjects who had supplemented with an algae product from Lake Klamath and found their B12 levels increased over a control group. Although not absolutely conclusive, researchers believed the preliminary research supported the argument that AFA is a reliable source of vitamin B12. [5]

Blue-Green Algae and Stem Cells

In adults, stem cells have the function of repairing damaged cells. Unfortunately, as we age, stem cells have a reduced restorative ability and are more vulnerable to oxidative stress. This results in the body being less able to repair itself. Based on previous studies that showed blue-green algae can modulate immune function in animals, the Department of Neurosurgery at USF investigated the effects of AFA on cultured human stem cells. Researchers noted that preliminary results suggested an ethanol extract of AFA may promote human stem cell proliferation. [6]

Potential Concerns about Blue Green Algae

Although blue-green algae is commonly consumed in the United States, Canada, and Europe, some concern has been voiced about the potential for presence of microcystin, a toxic byproduct of blue-green algae. In response, the Oregon Health Division and the Oregon Department of Agriculture have established regulatory limits on microcystin content in BGA products. [7] As with most products, if you’re pregnant or nursing, it’s a good idea to first consult your health care provider before supplementing with blue-green algae.

You should only consume AFA and spirulina from trusted and reputable suppliers. I personally use and recommend E3Live, which is harvested from Lake Klamath. E3 is a stand-up company I trust because of their solid ethical foundation and practices. If you choose to supplement with blue-green algae, you won’t be disappointed in the quality of their product.


  1. Kay RA. Microalgae as food and supplement. Crit Rev Food Sci Nutr. 1991;30(6):555-73. Review.
  2. Benedetti S, Benvenuti F, Scoglio S, Canestrari F. Oxygen radical absorbance capacity of phycocyanin and phycocyanobilin from the food supplement Aphanizomenon flos-aquae. J Med Food. 2010 Feb;13(1):223-7. doi: 10.1089/jmf.2008.0257.
  3. Benedetti S, Benvenuti F, Pagliarani S, Francogli S, Scoglio S, Canestrari F. Antioxidant properties of a novel phycocyanin extract from the blue-green alga Aphanizomenon flos-aquae. Life Sci. 2004 Sep 24;75(19):2353-62.
  4. Sedriep S, Xia X, Marotta F, Zhou L, Yadav H, Yang H, Soresi V, Catanzaro R, Zhong K, Polimeni A, Chui DH. Beneficial nutraceutical modulation of cerebral erythropoietin expression and oxidative stress: an experimental study. J Biol Regul Homeost Agents. 2011 Apr-Jun;25(2):187-94.
  5. Baroni L, Scoglio S, Benedetti S, Bonetto C, Pagliarani S, Benedetti Y, Rocchi M, Canestrari F. Effect of a Klamath algae product (“AFA-B12”) on blood levels of vitamin B12 and homocysteine in vegan subjects: a pilot study. Int J Vitam Nutr Res. 2009 Mar;79(2):117-23. doi: 10.1024/0300-9831.79.2.117.
  6. Shytle DR, Tan J, Ehrhart J, Smith AJ, Sanberg CD, Sanberg PR, Anderson J, Bickford PC. Effects of blue-green algae extracts on the proliferation of human adult stem cells in vitro: a preliminary study. Med Sci Monit. 2010 Jan;16(1):BR1-5.
  7. Gilroy DJ, Kauffman KW, Hall RA, Huang X, Chu FS. Assessing potential health risks from microcystin toxins in blue-green algae dietary supplements. Environ Health Perspect. 2000 May;108(5):435-9.

†Results may vary. Information and statements made are for education purposes and are not intended to replace the advice of your doctor. Global Healing Center does not dispense medical advice, prescribe, or diagnose illness. The views and nutritional advice expressed by Global Healing Center are not intended to be a substitute for conventional medical service. If you have a severe medical condition or health concern, see your physician.

  • Dean

    Great article! Thank you Dr. Group for verifying my own minimal (compared to yours) research.
    What do you think about mushrooms and their health benefits? Are you aware of any products which combine the benefits of both?

  • ghc_health

    Thanks for commenting, Dean! Mushrooms have many benefits as well, check out this article on the agaricus blazei mushroom-

    I have not seen any products that combine the two.

  • Dean

    Thank you for your response. Another great article!
    I have now read through several articles you have written. Your knowledge is impressive to say the least!
    I did find a product which does combine the two. Yea! :) Below is a brief description I copied from a website for their product called -Defend- which is specifically for Immune System Support.
    -Defend is a proprietary blend of reishi, cordyceps, maitake, shiitake, Turkey Tail, and Agaricus blazei, six of the most extensively researched mushrooms that positively support the immune system, combined with astragalus, beta glucan and of course our own Wild Bluegreen Algae. (from Upper Klamath Lake)
    What do you think?

  • ghc_health

    That looks like an interesting product. We offer E3 Live and have gotten quite a bit of good feedback-

  • Dean

    I just went to their site. That is unique to keep it frozen and alive. I’m sure it’s a good product. But, I would think that the combining with mushrooms would provide increased benefits. Especially since I don’t eat as healthy as I’m sure you do. Lol They have actually begun conducting double blind clinical trials with their specific products. I REALLY like that. Proof of efficacy is awesome and is missing from most other products. I’m ordering some and will be glad to let you know my results. Thank you!

  • Somebody

    You wouldn’t buy from E3 if you saw the way the harvested AFA.

  • Lee

    Hello I Am a bit late on the subject I purchased blue green algae supplement by Source Natural and was reading to be careful on brands chosen that possibly contain microcystins? Not sure wether it’s an actual concern to have or if it’s another way to keep natural remedies away from the public! Thanks

  • ghc_health

    Hi Lee, thanks for that information. i wasn’t aware of that concern but it at least raises a good point that purchasing these products from a reputable company with a track record of safety is important.

  • Carolina

    where can I order AFA algae capsults and be sure that they’re 100% organic and not contaminated??

  • wavemachine007

    And theeeeen…

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  • Louise

    I am new to this Blue Green Algae, I did purchase a bottle of Klamath Shores Blue Green Algae, is this brand safe?

  • Global Healing Center

    Can’t vouch for them, we get a lot of good feedback about E3Live though. Seems to be considered the gold standard for a lot of people.

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  • Marian Kluczny

    ich esse ein Konzentrat der afa alge seit 6 Jahren täglich 1100mg ich fühle mich fantastisch google me mfk24stem

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