Pseudoscience & Quackery

The Spirulina Racket And Why Panaceas Do Not Exist

What I saw on a white board at a school in Mysuru took me back to my days as a teacher of biochemistry, classes on nutrition and a lot of other stuff. It also awoke the consumer activist in me, and the myth buster too! The blurb says that 1 spirulina is equal to 10kgs of vegetables/fruits besides making claims of it containing all vitamins from a to z! Is spirulina what is claimed to be? How the peddlers of quack nostrums are taking gullible people for a ride and using scientific jargon to fool people needs to be pointed out so that one could be cautious on spending hard earned money for dubious stuff.

Supposed benefits of spirulina write on a white board at a school in Mysuru

Supposed benefits of spirulina write on a white board at a school in Mysuru

What is spirulina? Quoting from Wikipedia:

Spirulina is a cyanobacterium that can be consumed by humans and other animals; there are two species, Arthrospira platensis and Arthrospira maxima.

Arthrospira is cultivated worldwide; used as a dietary supplement as well as a whole food; and is also available in tablet, flake and powder form. It is also used as a feed supplement in the aquaculture, aquarium and poultry industries.

This apart, can spirulina live up to claims made by the peddlers of what they call as nutraceuticals, naturopaths, alternative medicine ‘consultants’ and a host of other quacks? Capsules of this are being peddled by ‘experts’ whose knowledge of nutrition is gained from the dubious literature peddled by the dealers of these preparations it claimed to be an excellent source of dietary protein, vitamins, antioxidants, zero cholesterol and such. How many of these are supported by evidence? From a source of cheap protein how it has become more expensive than the best of dietary protein are the points to be raised here.

Here is the composition of spirulina (Source: Wikipedia):

Nutritional value per 100 g (3.5 oz)
Energy 1,213 kJ (290 kcal)
23.9 g
Sugars 3.1 g
Dietary fiber 3.6 g
7.72 g
Saturated 2.65 g
Monounsaturated 0.675 g
Polyunsaturated 2.08 g
57.47 g
Tryptophan 0.929 g
Threonine 2.97 g
Isoleucine 3.209 g
Leucine 4.947 g
Lysine 3.025 g
Methionine 1.149 g
Cystine 0.662 g
Phenylalanine 2.777 g
Tyrosine 2.584 g
Valine 3.512 g
Arginine 4.147 g
Histidine 1.085 g
Alanine 4.515 g
Aspartic acid 5.793 g
Glutamic acid 8.386 g
Glycine 3.099 g
Proline 2.382 g
Serine 2.998 g
Vitamin A equiv.


29 μg


342 μg

0 μg
Thiamine (B1)

2.38 mg

Riboflavin (B2)

3.67 mg

Niacin (B3)

12.82 mg


3.48 mg

Vitamin B6

0.364 mg

Folate (B9)

94 μg

Vitamin B12

0 μg


66 mg

Vitamin C

10.1 mg

Vitamin D

0 IU

Vitamin E

5 mg

Vitamin K

25.5 μg

Trace metals

120 mg


28.5 mg


195 mg


1.9 mg


118 mg


1363 mg


1048 mg


2 mg

Other constituents
Water 4.68 g


And mind you the quantities are in units per 100 grams of the dried powder. So, does this stand up to the claims made by the vendors? Let us examine these points one by one.  Don’t go by the long list of constituents because we could make one such for any item of dietary use. If one were to use this as an exclusive source of energy- you would have to consume half a kilogram of it to meet your daily needs!

While the protein is of good quality it is not the best. The best protein is egg albumin whose arbitrary biological score is 100 and all proteins are rated by this score. While a gram of egg protein would cost one around a rupee the same quantity as that of spirulina would cost more than ten rupees assuming that one takes it in the form which costs Rs.2.50 for a 500 mg capsule in India. Is it a remedy for anything at all? The information lies here. In this it has been mentioned that the protein of spirulina is thirty times more expensive than the best one available in the market!

It is also claimed to be an excellent source of vitamin B. Well, what is vitamin B? For the uninitiated, there is nothing called as Vitamin B! The term vitamin B complex applies to a group of water soluble vitamins which were put under a common class since they were water soluble and as more and more of them were discovered a system labelling them with numbers started and hence we have the vitamins prefixed B1 to Bn. But as the chemical composition of these entities came to be known, the system was stopped. However the peddlers of quack remedies have still stuck to the old ways as their information on nutrition is confined to what they have been spoon fed by their so called trainers in a system of self perpetuation of half baked information with an eye of taking people for a ride to peddle their concoctions.

So, a product which was meant to be a cheap source of nutrition has become an expensive nostrum converted into that by an industry out to make profits by exploiting the gullibility of humankind. Well let us take a look at other claims too- spirulina is claimed to be zero cholesterol- yes it is! The same claim is put forward in a number of ads of vegetable oils and they are very right too. But if you take a good look at the composition of these it would clear that cholesterol is only an animal sterol and not a nanogram of it would be present in any vegetable source(of course ghee, butter, milk fats though are claimed to vegetarian, strictly speaking they are fats of animal origin and contain cholesterol). So, this claim is right after all.

But, these apart does any evidence exist as to make it a panacea that it is claimed to? Sorry to say it does not. Except for the claims made in the blurbs of the peddlers and dubious sites of ‘alternative medicine’ there seems to be little evidence to support the hype that spirulina can be anything but a cheap source of nutrition as it can grow without any fuss. It does not need much to grow except an alkaline medium and salt supplementation if grown in fresh water. If done in sea water it would not even need that as the sea water contains enough of it. The concoctions peddled by the alternative medicine, nutraceutical, direct marketing lobby falls flat as the dried powder of this is many times more expensive than the best of dietary proteins of better quality. As for the hyper doses of water soluble vitamins present all they can do is to be flushed down the drain as consuming in excess can do very little except getting them excreted in the urine! As for its taste it goes a by a common myth- that is something is to be good for you it should taste vile and that is reason why it is peddled as capsules to mask it. Any way one of it is claimed to equal to 10 kgs of vegetables/fruits! Finally if our vedic ancient knowledge lobby could try, they could always claim that it existed in our Vedas and it was discovered by a Spiruraj Maharshi and hence called as Spiru lina and our ancient ponds and tanks were full of it!

About the author

Narendra Nayak


  • There are many such ‘miracle’ products sold in India. One such product which gained lot of attention is ‘aloe vera’ which is touted as a panacea for all types of diseases as well as for beauty treatments.

  • Sir
    then why NASA is feeding spirulina to the astronauts and why NASA claims spirulina as the best nutrition source for long space missions? .

    • Do cite the claim.

      NASA goes by weight. It costs a lot to send things into space. So they prefer nutrient-dense foods.

      Companies frequently market by using NASA’s name. However, what’s good for an astronaut, whether it is a food or a bed, is not necessarily good for you and me, down here on earth. The conditions (zero gravity) and considerations (weight, storage, spoilage prone or not) are very different.

  • I used to occasionally buy Spirulina, while in US. Of course, I bought it as a nutritive food (as in, something to fortify wheat flour for the breads I used to bake), rather than as a special supplement. I bought it in bulk. It wasn’t expensive at all. When added in the bread-making process, it gives a mild, somewhat cheesy flavor to the loaves, which is a nice change, when done every now and then. It would be silly to buy it as a tablet of course.

    Its like Soy. Supplement companies market it as some precious supplement and charge high, for something that can and should be bought as mundanely and inexpensively as dal.

    Indian doctors also seem to prescribe protein powders, more than necessary, when simple dietary recommendations, such as egg-whites, are better and cheaper.

    In India, peanuts are very cheap. Their protein content is excellent. For me, a cup of peanuts is a meal replacement – its quick to eat, quite compact to carry, stores very well, and the healthy fats hold me for many hours. There were some programs in the past, by public health initiatives in India, that provided peanut based snacks for free, in schools, for poor children at risk for malnutrition. I thought it was a great idea. I have no idea how common peanut allergies are in India though.

    I would love to hear if a Biochemist like you has any corrections or suggestions on this.

  • This is so interesting. I love newspapers, but have never had much luck with the ones on Ancestry. However, Newspaper Archive which is available free through my local library has been a treasure trove. It is bits and scraps of daily life that comes across in so many of the newspaper articles. Cotatgrulanions on a finding a fascinating article.

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  • Thanks for sharing the nutrients content of the spirulina. Spirulina is the most demanding superfood right now. Spirulina will help us to cure any common and deadly diseases such as kidney problem, cancer, blood sugar etc. by increasing our immune system in a safe way.
    thanks for sharing..

  • Spirulina is a superfood, which contains maximum nutritional contents. I am a regular consumer of it and know its benefits. Many people do not know about superfood and there benefits. People should know about it, they should use it regularly, and your post will motivate them.

  • Many people know the word superfood but they do not know exactly why we call them superfood and why they are superfoods? Spirulina is one of the best superfood available in nature. It contains more than 60% of the protein in it with other nutrients. It means if we consume 5 to 6-gram spirulina per day than it will fill our daily requirement of protein without any other food. Your post is an amazing post about spirulina and it will motivate others.

  • I don’t know where you learned your nutrition from but the protein content of the quantity of spirulina you have mentioned is for a small size dog.

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