The IGF-1 found in deer antler spray is derived from deer antler velvet, the tissue found inside the deer's antlers before they fully harden. Since deer antlers grow incredibly fast, it is not surprising that the horns are rich in IGF-1. This is a naturally-occurring form of IGF-1, meaning it is not made in a lab. As a result, deer antler velvet is considered a dietary supplement by the Food and Drug Administration, and unlike synthesized drugs, the product does have to be proven safe or effective before it's sold to the public.
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.
Deer antler velvet can play a pivotal role in helping to not only relieve the symptoms of diseases that affect joints, such as osteoarthritis, they can possibly eliminate them entirely. The way it may do this is through the introduction of chondroitin sulfate and glucosamine sulfate into the body. Both of these compounds are abundant in deer antler velvet.