Nopal

I've heard wonderful things about taking a shot of Nopal daily.   In fact when I was at the health food store I was asking the lady there about different items I was looking at when I got to Nopal.  She said it is amazing!  In fact the owner, she said, takes it daily and has psoriatic arthritis.  Since she has been taking it she has felt no pain and her medical prescription is almost non-existent.

She had me at psoriatic.

However the first day Steve took a shot of this he felt dizzy all day.  There are other factors that could have come into play with this but I'm wondering if anyone else has had this experience?
Any comments would be helpful.