As of 2015, not enough information is available to know what potential side effects antler or deer velvet has, states WebMD. The supplement may have potential negative effects for hormone-sensitive conditions such as breast cancer, uterine fibroids and ovarian cancer, and women who are pregnant or breastfeeding should err on the side of caution by avoiding this supplement.
Antler or deer velvet is the covering over the bone and cartilage on the antler area of a deer, according to WebMD. Typically, people use deer velvet to improve athletic endurance, boost strength, improve the immune system or keep infection at bay. Additionally, some use deer velvet to speed recovery from illness, provide stress relief, and treat migraines, asthma and indigestion. Some people use antler velvet to treat high cholesterol or high blood pressure, relieve muscle aches and pains, and treat osteoporosis, headaches and indigestion.
People use deer velvet to increase estrogen and testosterone to improve fertility, as both are sex hormones, states WebMD. An increase of these hormones may improve fertility and improve issues with male sexual performance issues, such as erectile dysfunction. Women use antler velvet for menstrual or menopause issues and uterine bleeding and to reduce the amount of estrogen needed in hormone replacement therapy.