Another Update on Spirulina


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  • "We suspect that people taking spirulina as a source of vitamin B-12 may get vitamin B-12 deficiency quicker because the analogues in the product block human mammalian cell metabolism in culture [i.e., in the lab] and we suspect that they will also do this in the living human." – Victor Herbert

  • Spirulina keeps the immune system artificially and acutely on-call. It may be good for a temporary boost in immunity, but as a daily food, it increases inflammation and the risk of developing auto-immune disorders.

  • I personally had a terrible experience with this stuff. Causes acidic blood, gout, do not take this stuff, read more about it. Cancer thrives in acidic blood, yes it may eat your muscles from the inside out. Take enough and wake up with gout that you never had. Most westerners have acidic blood already. This is a marketing gimmick and I will guess it will be outlawed soon, dangerous stuff. Yes it increases inflammation.

  • The point you raise is the reason why it is grown & harvested at a pH over 10 (between 10-11). This is part of the quality control that commercial producers and small-scale producers employ to ensure spirulina's quality for consumers. If it's not at the right pH, it simply doesn't get harvested. The liver toxins you're speaking of are called microcystins, which are peptides produced microcystis, not by spirulina. Microcystis are unable to survive at such a high alkaline level between 10-11

  • I wouldn't trust these guys as far as I can piss. Man is finally begining to eliminate the middle man. Doctors,Pastors and the likes. Man when harmonized with his environment has the capacity  to nourish and restore himself  into good health. The problem is they want you on pills. As far as the mentioning of pastors….same difference, middle man. So this is for these guys and this is for the horse they rode in on. What we should be throwing away is the garbage these self appointed farmers of human stock feed us every chance they get. Hey doc..ask the medical community to help you grow hair; you geniouses who clain to be able to replace the creator ought to be able to figure out  at least that much….. right???

  • Another update: THis video is lunacy, made by someone who didnt even read the study they quote, but then proceed to demonize an amazing plant. I cringe at the thought that 30k people have subscribed to this quack.

  • you are doing so much harm with your ridiculous so-called information.  I hope and pray that no one – and I mean NO ONE is listening to you.

  • I've just finished reading through the articles from which your conclusions are drawn (from the first 2 algae and Spirulina videos as well) and i gotta say, none of the papers suggest that Spirulina is bad for health, in fact they all suggest Spirulina is good (blood pressure, cholesterol, immune system, helping toxicity within the liver etc) for health. The issues arising with Spirulina from these papers is more an issue of quality control and contamination or lack of transparency and misinformation by where a different (toxin producing) cyanobacteria make it into the product. Kind of like if i buy 40 different chickens for example from 40 different stores and 1 of them has uncooked flesh. Should i tell everyone to avoid eating chickens or make sure the flesh gets cooked properly? Same can be said about the cultivating and processing of Spirulina. The literature you present demonstrates nothing but positives about Spirulina. If anyone wants me to clarify any of these statements i would be glad to, alternatively you can gain access to the articles presented in these videos and read them for yourself. I do not agree with the conclusions presented in the video.

  • spirulina by itself not toxic..the issue is that during the cultivation process cyanobacteria can contaminate the harvest…cyanobacteria is a highly toxic bacteria that in large doses attacks both the liver and central nervous the problem is  finding an honest company  who takes all the necessary measures to ensure their product is free of cyanobacteria… 

  • I like ALL of Dr. Greger's videos except this one. Spirulina is considered a whole food source and has some of the highest nutrient-dense concentrations. I think in moderation, it would be fine. Like anything, excess can bring about potential problems. Interesting opposing view nonetheless in increasing awareness. But spirulina has been around for quite a long time, and I have not read or heard of any significant health issues or claims like ephedra or other potentially-harmful sources. It took only a short period of time for ephedra to be deemed as unhealthy based on the case-reports and actual incidents from it. 

  • A RECENT study on spirulina showing the opposite effect of what's mentioned here in this video-

    And a grade A safety conclusion was given as continuing on-going research is being done-

    Another study concluding spirulina safety-

    And yet another study of how NASA used spirulina with their astronauts and how it's regarded as safe-

  • Weak. Information on what specific supplements were tested? They could have been from Beijing for all we know…You need to give more info if you are going to make such black and white arguments.

  • THIS IS THE SOURSE SO YOU CAN MAKE YOUR OWN INTERPRETATIONS OR CONCLUSIONS Anatoxin-a is a potent neurotoxin produced by several species of cyanobacteria. This alkaloid may cause fatal intoxication to exposed organisms and this has raised concerns over the increasing popularity of food supplements containing cyanobacteria. These are being marketed with alleged health properties for animal and human consumption. These supplements most commonly contain the genera Spirulina (Arthrospira) and Aphanizomenon and their consumption represent a potential route for anatoxin-a exposure in cases where adequate quality control is not undertaken. In this work, several dietary supplements containing cyanobacteria from different commercial suppliers were evaluated for the presence of anatoxin-a by high performance liquid chromatography with fluorescence detection. Additionally, the presence of the previously derivatized anatoxin-a was confirmed by using Gas chromatography–mass spectrometry. A total of 39 samples were analysed in the study. Results showed that three of the samples (7.7%) contained anatoxin-a, at concentrations ranging from 2.50 to 33 μg g−1. Quality control of cyanobacterial food supplements is required to avoid potential health effects in humans and animals.

  • This guy is superb doctor that cares for our health, BUT he got few things REALLY wrong and one of them are blue-green alge. We shouldn't judge him too hard on this one, he probably reads more studies in 1 month that we all do in our life.


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