Juniper berry

What is juniper berry?

Juniper berries are the small, bluish seed cones of the common juniper (Juniperus communis), an evergreen shrub found across the Northern Hemisphere. They are best known as the flavoring in gin and as a seasoning for game dishes. In folk medicine, juniper has traditionally been used for urinary and kidney complaints, digestive problems and inflammation. The berries are rich in volatile oils, phenolic compounds and terpenoids.

What the research says

A 2022 review in the International Journal of Molecular Sciences summarized a wide range of reported activities for juniper extracts, including antimicrobial, antioxidant, anti-inflammatory, antidiabetic and cholesterol-lowering effects. Almost all of this work comes from test tubes and animals. The review describes juniper as a promising source of bioactive compounds for future drug development, which is a long way from evidence that a juniper supplement supports blood sugar in people.

We did not find well-designed human clinical trials testing juniper berry for blood glucose, insulin sensitivity or weight. Claims on sales pages, such as juniper’s use by ancient athletes or its “healing powers,” are historical or promotional rather than scientific. For now, juniper’s role in blood sugar formulas rests on tradition and preclinical data.

How it’s used in supplements

Juniper appears in some blood sugar and “detox” blends, usually in undisclosed amounts within a proprietary formula. Culinary amounts are generally considered safe. Concentrated juniper preparations and juniper oil have traditionally been considered irritating to the kidneys with prolonged or high-dose use, and juniper has historically been avoided during pregnancy. Because it is often marketed for kidney and urinary use and may have diuretic properties, people with kidney disease, those who are pregnant or breastfeeding, and anyone taking diuretics, lithium or diabetes medicines should check with a doctor before using a product that contains it.

If a formula lists juniper without a dose, treat it as a minor supporting ingredient. It is not a reason to choose one blood sugar product over another.

It is also worth separating juniper berry from juniper essential oil. The oil is far more concentrated and is used in aromatherapy and perfumery, not as a dietary ingredient, and it should not be swallowed. Supplements use dried berry powder or extracts. As with other botanicals that have only laboratory data, the most honest description of juniper in a blood sugar product is an untested traditional addition. It neither strengthens nor weakens the case for the product much on its own.