Berberine is a golden-yellow plant compound found in botanicals such as barberry, long used in traditional herbal practice and now one of the most searched-for supplements around. Neurogan Health, a family-owned Californian brand, offers it here as a straightforward single-ingredient capsule.

Each bottle contains 90 vegan-friendly capsules of high-purity berberine HCl, made in the USA in a GMP-certified facility and third-party lab tested, with no gluten, dairy or soy in the formula. There is nothing else added, which makes it easy to see exactly what you are taking. Swallow with water as directed on the label, ideally alongside food.

A tidy option for anyone who has read about berberine and wants a clearly labelled, well-tested version from a brand that publishes its lab results.