In vitro supply' refers to the process of providing OVA, or eggs, outside of the body in a laboratory setting. This process is used in assisted reproductive technologies such as in vitro fertilization and other forms of assisted reproduction. The OVA are collected from the woman and then placed in a laboratory environment where they can be fertilized by sperm and then transferred into the woman's uterus for implantation. In vitro supply is an important part of assisted reproductive technologies as it allows for the collection and cultivation of OVA outside of the body.