Retinyl Palmitate is preformed Vit A. I personally use this:
http://www.vitaminshoppe.com/store/...t=cs&source=FG&ci_src=14110944&ci_sku=EN-1034
I hard a hard time finding it. This is the only place with the lowest iu I found.
The Vit A Brad Ramsey is recommending is in the form of fish oil & this is what you will find in most stores.. I tried Rite Aid, CVS, etc..
I tried the fish oil Vit A in gelcaps. I placed a teensy drop on a hornworm. From my experience, observing them, they seemed to act weird. Like Jim Flaherty from the Chameleon Company said, it seemed like they wanna throw up (well not exactly his words).
I tried Retinyl palmitate & they did not exhibit the same behavior. They seemed to act normal.
Here is an interview with him with the chameleonnews.com & how he suggested using retinyl palmitate. I believe this interview was done around 2005-2006 because it states his son was due 2006 of october.
There's also other threads here wherein he talks about it. Using a q tip to administer it. Some people don't use it.
http://chameleonnews.com/?page=article&id=76