Some essential oils are known to improve blood flow and may help reduce erectile dysfunction. One study found 30 scents that increased blood flow to the penis. Lavender combined with pumpkin pie scent was the most effective, increasing penile blood flow by 40%. The combination of black licorice and donut was the second-most effective scent, increasing penile blood flow by 31.5%. Nutmeg is also an aphrodisiac that is known to enhance circulation, which may be effective at improving erectile function.