Where or from who does the hair come from that makes "human" hair extensions?

people usually donate it or possibly sell it to companies who manufacture it. Or possibly a horses tail

Where or from who does the hair come from that makes "human" hair extensions?

People in poor countries. And they get paid next to nothing for it.

Where or from who does the hair come from that makes "human" hair extensions?

Diane is right. India, China, South East Asia and South America are all providers of human hair, and that is why you pay more for lighter colours - most of the donors have naturally dark, straight hair.

Where or from who does the hair come from that makes "human" hair extensions?

People sell their hair. I would imagine it is from the poorer countries who have little or no other way of making money to live.