After 30 years of research, valerian root shows promise for sleep—but the reality is more complex than marketing claims suggest.

Your gut produces 90% of your serotonin, but can probiotics really boost your mood? We examine the science behind psychobiotics and what they can actually do.

Cordyceps promises superhuman endurance, but does the science match the hype? We examine what this parasitic fungus can actually do for your energy levels.

40% of UK adults are vitamin D deficient in winter. The NHS recommends daily supplements – here’s why geography makes this essential for British health.