Spirulina is a perfect superfood ? Or is it just a quackery?

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So I read the benefits of Spirulina, and it sounds too good to be true. Since Spirulina is sold in small supplement pills, is it really has that great effect to the body to be consumed, consider that small pills or tablets? And so many benefits in just one kind of vegetable? I feel it sounds like a quackery and too good to be true, how do you think? The claimed benefits of Spirulina such as : Spirulina contains all the other B vitamins, vitamin D, vitamin K, vitamin E, calcium, chromium, copper, iodine, magnesium, phosphorus, potassium, selenium and zinc. It has various antioxidants, phytonutrients and carotenoids. It protects the brain and detoxifies the liver and kidneys. It balances pH to reduce inflammation, the root of much disease. It balances the immune system, including calming an overactive one, which is significant because overactive (or inflamed) immune systems are responsible for autoimmune diseases. These usually have their root in poor nutrition and digestion, which spirulina also helps correct. Its superfood status means spirulina has many more benefits. It increases antioxidant protection, fights free radicals, fights the aging process, curbs appetite and promotes weight loss, supports health cardiovascular function, improves the digestion process and gastrointestinal health, creates beneficial flora in the digestive tract and makes the body produce more red and white blood cells which kill germs and viruses. Spirulina's antimicrobial effects help control the growth of pathogenic bacteria and yeasts. The chlorophyl means it is a blood cleanser. It also oxygenates the blood. Polysaccharides improve the functionality of bone marrow, thymus, and spleen cells. Spirulina is good for the skin too: it improves age spots, eczema, acne and rashes. It's good for the eyes as well, helping with glaucoma, cataracts and poor vision. spirulina improves allergies and respiratory function and enhances exercise performance. Taking spirulina between meals is beneficial for hypoglycemics because the high protein content stabilizes blood sugar levels. So these too amazing benefits keep me wondering whether it's exaggerated or not.....