Does any one know about Kalonji?

I am eager to know about this. I heard onion is good for hair regrowth even on bald. Does onion seeds are related to onion? I am lazy in mashing onion and applying. I'll be happy if there is some oil ready to use.
Let me know where can i get in bangalore.

Kalonji is called as black seed, black onion seed, nigella sativa seed,… Abu Huraira (Radi Allah Anhu) reported Allah's Messenger (sal-allahu- alleihi-wasallam ) as saying: There is no disease for which Nigella seed does not provide remedy - Except death.
For Hair Loss & Premature Greying:
scrub the scalp thoroughly with lemon, leave it for 15 minutes & shampoo & dry with thereafter apply kalonji oil to whole scalp, continue for a 6 weeks.