They're called research chems because they are used extensively for research, have been used in multiple clinical trials, and are normally given out for human use every day under generic names as prescribed by doctors.... When it comes to prices.... well some companies are just out to make bigger profit per sale... its all marketing. Let me give you a hint... if you see IGF-1 lr3 for over 100$, a. you're getting fucked in the ass and b. its most likely the same purity as everyone elses.
Tamoxifen - Nolvadex - Given to women for breast cancer
Taldalafil - Viagra - Given to men for ED
...you get the point.