Vitamin A and Hair Loss?

I have heard that too much vitamin A can cause hair loss, is this true? My multi-vitamin contains 100%DV and I recently found out that a medium sweet potato has over 400%DV. There are other items in my diet as well with small amounts of vitamin A.

Too much of a good thing can be bad, and yes, getting too much Vitamin A can produce hair loss. But, I doubt natural foods such as sweet potato can cause you to lose your hair, nor any ordinary supplements with Vitamin A in it.