How do people get human hair extensions?

Like, when people say oh this is 100% real hair..





Do people just randomly volunteer and be like oh hay use my hair for your hair extensions





Or what? Because there is SO many hair extensions in the world, I am so shocked that so many people would grow theyre hair that long and cut it off, such as 20 inches or whatnot


Like how do they get it?How do people get human hair extensions?
This is totally true saw a documenty on it actually. Some hair comes from india where they get good money to sell their hair. But a majority of it comes from human cadavers (dead people). This is no joke look it up, saw a whole thing on it.How do people get human hair extensions?
I think they sell it for probably a good amount of money. Then there's a special place that makes wigs and stuff like that and they'll cut it and dye it and sell it.

blackheads