[2] Unlike the separated and woody scales of a typical pine cone, those in a juniper berry remain fleshy and merge into a unified covering surrounding the seeds.[5] From extracts of the berries, fatty acids, terpenes, aromatic compounds, and hydrocarbons, such as pinene, sabinene, terpinen-4-ol, limonene, and myrcene, were isolated.[5] While classified as generally recognized as safe in the United States,[6] juniper berries may have various side effects that have not been tested extensively in clinical trials.[5] Mainly due to an increased risk of miscarriage, even in small doses, consuming juniper berries may affect pregnant or breastfeeding women.[11] The flavour profile of young, green berries is dominated by pinene; as they mature this piney, resinous backdrop is joined by what Harold McGee describes as "green-fresh" and citrus notes.A few North American juniper species produce a seed cone with a sweeter, less resinous flavor than those typically used as a spice.[18] In addition to medicinal and culinary purposes, Native Americans have also used the seeds inside juniper berries as beads for jewellery and decoration.
Young green and mature purple berries can be seen growing on the same plant.