Even sellers of deer antler products doubt that the products could deliver IGF-1. "IGF-1 is very unstable," Dean Nieves of Florida-based Bio Lab Naturals told the Baltimore Sun. "It could not exist outside of a very controlled environment." Nieves' company therefore markets the product as a nutritional supplement. "It is just packed with nutrients," he said.
The answer is that deer antler velvet is just another fat burner. Another cell volumizer. Another body-toning shoe. It’s fitness marketing at it’s finest—playing off a goal you desire (gaining more muscle and size) and drawing unsubstantiated and wildly exaggerated claims. There’s nothing miraculous about deer antler spray. And after a closer look at the product, there’s really—well—nothing to it at all.
A systemic review on human interventions makes note of a study conducted on patients of osteoarthritis (Edelman et al. 2000; cannot be located online) which found improvements in joint pain symptoms relative to baseline in the Velvet Antler group and not placebo, although a lack of information on blinding and randomization precludes results that can be drawn from this study.