17942
The experience gained from traditional use is efficient to detect immediate or near - immediate relationship between administration and toxic effects but is quite unlikely to detect medium - to long - term toxicities ; thorough investigations of herbal medicines ( toxicity assessments , active pharmacovigilance ) appear then essential for their safe use .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None