This is a challenge I’ve heard of for some time now, but surprisingly, it’s something I’ve never bothered to try. The Castor Oil Challenge is a period of three months where you apply cold pressed, cold processed castor oil directly to the scalp several times a week in order to promote hair growth.
I’m a member on Hairlista, and challenges like this are always running amuck; this is probably the most popular of them all. Why? Simple: castor oil is known to grow and thicken hair within a reasonable amount of time. By reasonable, I mean fast. A lot of people just use it to thicken up their edges, but several use it to grow their whole head.