Thinning hair and hair loss can occur for many reasons, but depending on the root of the issue, evening primrose oil may help. While more research is needed, evening primrose oil could be a great tool as part of a comprehensive hair regrowth strategy. Read on to learn the benefits of evening primrose oil for hair, and a step-by-step guide to regrow hair by applying primrose oil. The Benefits of Primrose Oil for Hair Evening primrose oil is distilled from the seeds of the primrose, a flowering plant native to Europe and North America.