Um, probably because those spells are fake, no spell can alter the physical plain, no spell will work instantanuously, they work when they work. Maybe instead of asking for a spell, you should be asking how to learn real magic? Also, please do not use all caps.
Sorry but as has already been said, just because a spell is written, doesn't mean it is going to work, that applies to most spells but certainly to those in the fantasy section.
Humans are humans because of our DNA, magick cannot do anything to change it, so you will be human forever.