I am under the impression that an rpm/drive/neovar/igf-2 stack would be safe to take at 18, but my question is would the igf-2 be effective with already high test levels?
Using RPM, Drive, NeoVar Recomped and IGF-2 is safe to take at 18. However, aside from NeoVar Recomped, you do NOT need to use any of these products at 18. Get the basics right re nutrition and training, building a solid training and staple supplementation base before using other products, as you can achieve all your body goals at that age with solid nutrition and training. And FYI, IGF-2 is more of a Growth Hormone booster (although also a testosterone booster) and is effective, period.