Beautyrest Pressure Smart substances that have toxic effects on the liver - their purpose is damage to liver cells, although harmful effects on the kidneys are also noted, such toxins include: microcystin, nodularin and cylindrospermopsinneurotoxins are a type of toxins acting on the nervous system - they cause muscle paralysis and then suffocation due to respiratory failure: anatoxin-a, anatoxin-a (s), saxitoxin;dermatotoksyny produce compounds which are toxic to the skin - skin itching , burning, swelling ,