Don't worry, the rumor that heavy metals in spirulina exceed the standard is not true. Spirulina is the most abundant and balanced organism known to mankind at present. Scientific tests show that the nutritional content of 1 g spirulina powder is equivalent to the sum of 1 1,000 g of various vegetables and fruits. Hundreds of years ago, some tribes in Africa made spirulina into algae cakes to eat. Its practical history is very long, and there is no problem of excessive heavy metals!