Kindly may I know what are the benefits and effects of spirulina by taking as food.

Question

Spirulina is a type of blue-green algae that grows in both salty and fresh water. It may be the single most nutrient-dense food on earth. 
Spirulina is a fantastic source of antioxidants, which can protect against oxidative damage . Studies have shown that spirulina can lower triglycerides and LDL cholesterol, and sometimes may raise HDL (the "good") cholesterol.Spirulina may have some anti-cancer properties as well.
As a dietary supplement, the recommended minimum amount is three grams daily .
Doctors consider Spirulina to be safe in general,  But Spirulina may become contaminated with toxic metals, harmful bacteria and microcystins ? toxins produced from some algae ?if it is grown in unsafe conditions. Contaminated Spirulina can cause liver damage, nausea, vomiting, thirst, weakness, rapid heartbeat etc. Find the supplements that  are grown in safe conditions and tested for toxins.

Diet Clinic · Accepted Answer

Spirulina is a type of blue-green algae that grows in both salty and fresh water. It may be the single most nutrient-dense food on earth. 
Spirulina is a fantastic source of antioxidants, which can protect against oxidative damage . Studies have shown that spirulina can lower triglycerides and LDL cholesterol, and sometimes may raise HDL (the "good") cholesterol.Spirulina may have some anti-cancer properties as well.
As a dietary supplement, the recommended minimum amount is three grams daily .
Doctors consider Spirulina to be safe in general,  But Spirulina may become contaminated with toxic metals, harmful bacteria and microcystins ? toxins produced from some algae ?if it is grown in unsafe conditions. Contaminated Spirulina can cause liver damage, nausea, vomiting, thirst, weakness, rapid heartbeat etc. Find the supplements that  are grown in safe conditions and tested for toxins.