Too much Vitamin A is not good for you. And I can tell you that by experience. But you haven't overdose like me (I took accutane). Don't need to worry about eating the spinach so as long as it's raw. The vitamin A on spinach is not problem because it is of the water soluble kind so any excess you will excrete. The problem with the spinach is the oxalic acid which blocks the calcium absorption but I have read it would be harmful if the spinach is cooked. Raw is okay.

I believe everything in moderation is the best for your health. So my advice to you is to consume it in moderation.

as far i know vitamin A is a fat soluble vitamin.so if access amount of vitamin A can make toxiity.cause for their fat solubility they can't excreate by kidney.