(4 mins) Transcript. Dr Greger's summary: "Men eating pistachio nuts experienced a significant improvement in blood flow through the penis accompanied by significantly firmer erections in just three weeks — perhaps due to pistachios' antioxidant, arginine, and phytosterol content."

(4 mins) Transcript. Dr Greger's summary: "There may be a way to get the benefits of over-the-counter melatonin supplements without the risk."