BCD

I went from a 2-3 day a week workout program with no cardio and an extremely crappy diet to a 5 day a week focused weights and cardio workout program coupled with a good diet, meal replacements and pro-whey supplements. I am seeing good fat loss and some more size and strength, but want to take it to the next level. I have an ectomorphic body type, so even though I'm in good shape I still look way too thin. People have mentioned me looking into taking creatine or glutamine. Any thoughts? Are there any sideeffects I should be aware of? Thanks.