‘Biofibre’ of Italy and ‘Nido’ of Japan are used by some. They have become safer than before although their use is banned in USA.
Reactions to the fiber requiring fiber removal, identifiable as immunological reactions around 1%, while mild/slight complications (including infections), are around 11%.
"The International Society of Hair Restoration Surgery (ISHRS) does not voice an official position with regard to the use of artificial hair fibers and leaves their use up to the regulatory authority within that country. It is the view of the Society that this is a surgical procedure and as such should be confined to active participation of an experienced, licensed medical doctor in a reputable medical clinic or university setting. As with any surgical procedure, complications may occur which should be handled under a physician's care."
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