In another randomized, double blind, placebo controlled experiment (Broeder, 2004), 38 males, all of whom were experienced weightlifters, entered a 10 week strength training program. Those who took deer antler velvet experienced an increase in peak torque and average power relative to the placebo group. They also experienced unexpected improvements in aerobic performance.
The company has found that powders have only about a 15–20 percent absorption rate of IGF-1. This is due to how the digestive system breaks down the powder. Nutronics states that their “proprietary sublingual spray delivery system” is superior to many competitors because it offers “enhanced bioavailability” of IGF-1. They also point out that “it is not the milligrams of Deer Antler Velvet in the product, it’s the content of IGF-1 and other Growth Factors in Deer Antler Velvet, that makes the difference.”(6)
"Unlike steroids, which are small, cholesterol-based hormones, protein-based hormones or growth factors can easily be destroyed," he wrote in an email. Cohen guesses that even if you consume high levels of IGF-1, most if not all of the substance would be destroyed after hitting the acid in our stomach and before entering the blood system, which is how compounds we ingest reach the muscles. "This is also why you have to inject insulin instead of just eating insulin pills," he added.