Assertion: kelp's level | /r/HasProperty | harmful
Facets:
Source sentences:
text: However, sea kelp can often have large and ranging levels of iodine which can be harmful.
text: Similarly, a study of the metal content of seaweeds washed up on the Brazilian coast also showed that some toxic metals were at levels considered harmful, although with remediation of nearby industrial contamination sources these macroalgae represent a potential food alternative for humans (de Oliveira et al. 2009).