Is there any prohibition to eat human hair? For example, if a hair fall into a drink, am I obligated to take it out, or can I drink even though I will swallow the hair?
If one of your hairs falls into a drink you are allowed to drink it and you do not have to remove it. It is permitted to eat hair of a human that is alive, (however we may not benefit from the hair of a dead body).
Kaf Hachayim Y:D 69-11.