Snippet from the article:
Onion juice could help some people with patchy hair loss resulting from the disease alopecia areata, an Australian researcher says.
“Although there is no proven treatment, some people might choose to try a ‘safe’ treatment — such as a topical steroid — even in the absence of good evidence of the treatment’s benefit,” said Dr. Mike Sladden of the University of Tasmania.
One small, unpublished study found hair regrew in almost half of 60 subjects with mild cases who applied onion juice — an alternative medicine used for infections, Sladden said.
Full text at United Press International — Onion juice may help patchy hair loss
Interesting reading.