Black Pepper to cover Gray Hair

I received this comment which I thought would be particularly helpful for everyone struggling with gray hairs instead of resorting to hair colors. 

"I don't have hair loss problem but my hair is dry and has lots of gray hair. I am applying yogurt mixed with black pepper thrice a week started this week. This is helpful to cover grey hair and my hair had become soft and looking darker."

Thanks a lot to the person who has dropped in this comment :)