Grape seed extract comes from the fruit of grapefruit tree. Grapefruit seed extract is a liquid substance extracted from the seeds of grapefruit. This extract has a number of healing properties and can help to get rid of bacteria and infections. It also promotes the overall health of the immune system which is imperative for the growth of hair. Just like the grapefruit, its seed extract is also rich in many nutrients. Grapefruit seed extract is also available in dietary supplement form.