According to my knowledge, no, I don't think there is a minimum sample size for an ethnopharmacological survey? But the larger the sample, the more important and interesting information was gathered.

Thanks for the answer.

Dear professor Zekhnini

You can study more on ethnopharmacological studies standards from attached file.

Also, I'm interested in ethnopharmacological studies. I can have part in your project if needed.

Best wishes

Ehsan Amiri Ardakani