N2slin you can find at needtobuildmuscle.com . Its one of my top favorite supplements by them. It helps improve insulin sensitivity among many other things. Great to take before meals containing carbs to shuttle nutrients to muscle and away from fat. IGF-1 lr3 is the long version of IGF-1. DES is the shorter version meaning it lasts much less time in the system. Most lr3 on the market right now is bunk. DES is usually good. It's best taken before or after your workout in the muscle groups trained with lots of carbs, creatine, and amino's. Its best used to shuttle nutrients to muscles during that critical time and has some site enhancement properties.