To Respond to your post, I work in a Doctors office that offers the Lifepak Nano as a supplement to its patients should they want to supplement. We have found great success with it, and patients are responding nicely.
In regards to your Vitamin A question, there is Actually only 1250 IUs per packet. When you read the product information page it states that 83% of the Vitamin A is in the form of Beta-Carotene, meaning if you need extra amounts of Vitamin A,(bc Beta Carotene is a precursor to Vitamin A) then the Beta Carotene with transfer into Vitamin A, and if not it will be used as an antioxidant.
So essentially this make LPN a better supplement, but it actually becomes tailored to your body.