Deer antler velvet is banned in competitive sports because it contains IGF-1, a naturally occurring growth factor that appears on the World Anti-Doping Agency’s Prohibited List. The substance itself isn’t named on the list, but the active compound inside it is classified under prohibited peptide hormones and growth factors. Outside of sports, deer antler velvet occupies a legal gray zone in the U.S., where it’s sold as a dietary supplement but has drawn FDA enforcement action against companies making health claims.
The IGF-1 Problem
IGF-1 (insulin-like growth factor 1) is a hormone your body produces naturally, primarily in the liver, in response to growth hormone. It plays a central role in muscle growth, tissue repair, and cell regeneration. Because synthetic IGF-1 can enhance athletic performance by accelerating recovery and promoting muscle development, WADA classifies it as a prohibited substance under Section S2.3 of its Prohibited List, alongside other growth factors that affect muscle protein synthesis, energy use, and tissue regeneration.
Deer antler velvet, the soft cartilage-like tissue covering a growing deer antler, contains IGF-1 along with several other growth factors including epidermal growth factor and transforming growth factor. These compounds are what drive the remarkable speed of antler growth in deer, which is one of the fastest types of tissue regeneration in mammals. When companies began marketing deer antler velvet sprays and capsules to athletes as a natural performance booster, anti-doping authorities took notice.
WADA has issued direct warnings urging athletes to be “extremely vigilant” with deer antler velvet spray because it could lead to a positive test. The agency’s position is straightforward: there can be no guarantee that IGF-1 taken orally won’t influence blood levels of the hormone, which may then show up in anti-doping testing. Even though the quantities of IGF-1 in deer antler velvet are small compared to synthetic injections, the risk of triggering a violation exists.
The Vijay Singh Case
The most high-profile case involving deer antler velvet hit professional golf in 2013. Vijay Singh, then approaching his 50th birthday, told Sports Illustrated that he had used deer antler spray. Because the spray was said to contain IGF-1, which appeared on the PGA Tour’s list of banned substances, the tour launched an investigation. A sample from Singh was tested and returned small amounts of IGF-1.
Under the tour’s policy at the time, simply admitting to using a banned substance counted as a violation, even without a failed test. Singh was told he would be suspended for three months. But two months into the process, the tour dropped its case. The reason: WADA had clarified that it no longer considered deer antler spray a violation on its own, only if it actually produced a positive test result, because the IGF-1 content was so tiny. The PGA Tour later acknowledged it did not believe Singh intended to gain an unfair advantage.
Singh wasn’t satisfied. He sued the tour for “public humiliation and ridicule” during the 12-week investigation. The lawsuit dragged on for more than five years before the two sides settled in 2018, just a week before the case was set to go to trial in New York. The terms were not disclosed.
How It’s Regulated in the U.S.
Deer antler velvet is not illegal to buy or sell in the United States. It’s widely available as a dietary supplement in capsule, powder, and spray form. But the FDA does not approve supplements for safety or effectiveness before they reach store shelves, and when companies cross the line into making medical claims, regulators step in.
In 2017, the FDA issued a warning letter to Tobin Farms Velvet Antler, a company selling deer antler capsules and powder. The agency determined that the company’s marketing materials, which promoted the products for treating or preventing diseases, made the products unapproved drugs under federal law. The FDA’s position was that because the products claimed to treat conditions requiring a licensed practitioner’s supervision, it was impossible to write adequate directions for a consumer to use them safely. The company was warned that failure to correct these violations could result in seizure of its products and legal injunction.
This distinction matters. You can legally sell deer antler velvet as a supplement, but you cannot market it as a treatment or cure for any disease. Despite the wide range of health claims attached to deer antler velvet products (joint health, athletic recovery, sexual performance, anti-aging), no scientific evidence supports any of these claims, according to the Department of Defense’s Operation Supplement Safety program.
Animal Welfare Concerns
Beyond the doping and regulatory issues, deer antler velvet carries ethical baggage related to how it’s harvested. Growing antlers are living tissue supplied with blood vessels and nerves. The velvet stage, when the antler is still soft and covered in a fuzzy skin, is when the tissue is most biologically active, and also fully sensitive to pain.
Harvesting requires cutting through the antler with a saw. The Australian Veterinary Association states bluntly that cutting velvet antler without pain relief is “inhumane and unacceptable,” and in Australia, it’s illegal. Proper harvesting protocols require sedating the deer or physically restraining it in a specialized crush, then applying local anesthetic before cutting. After the initial cut, the antler regrows and must be removed again, requiring the same level of pain management each time.
In countries with strong animal welfare regulations like Australia and New Zealand (both major producers of deer antler velvet), these protocols are enforced. But deer antler velvet is also sourced from countries with less oversight, and consumers typically have no way to verify the harvesting conditions behind the products they buy.
What the 2025 Prohibited List Says
The 2025 WADA Prohibited List does not mention deer antler velvet by name. What it does prohibit, under the category of peptide hormones and growth factors, is IGF-1 and its analogues, along with “other growth factors or growth factor modulators affecting muscle, tendon or ligament protein synthesis/degradation, vascularisation, energy utilization, regenerative capacity or fibre type switching.” Deer antler velvet contains multiple compounds that fall under this umbrella.
For competitive athletes, the practical takeaway hasn’t changed. Using deer antler velvet supplements carries a real risk of an anti-doping violation. The amount of IGF-1 in any given product is unpredictable, supplement labels are unreliable, and the consequences of a positive test don’t scale to intent. Whether the substance “works” as a performance enhancer is almost beside the point. What matters in the anti-doping framework is whether it contains a prohibited compound, and it does.