IGF-1 cannot be administered orally effectively. It could, if for some reason the manufacturer desired, be produced into an aerosol and inhaled, but you cannot take it orally. The stuff they sell in oral spray form is generally mixxed with alcohol in hopes to help it absorb into the mouth, but it just doesn't happen. If you have taken IGF before and tried the sprays I'm sure you can tell it doesn't work. Just take a little extra and if you don't get hypo and have a headache it isn't working.
As far as taking IGF with and without HGH goes, you can but don't have to.