Extra virgin olive oil and fresh lemon have long reigned supreme in the worlds of healthy cooking and home remedies. When taken together in the evening, extra virgin olive oil and fresh lemon juice are said to act synergistically to create a gently purifying antioxidant blend. Olive oil and lemon juice do, of course, offer plenty of health benefits independently. And, there is even some emerging clinical-trial evidence that extra virgin olive oil can improve bowel movement frequency and constipation. While olive oil does contain a little melatonin, the reported concentrations are pretty tiny, and there’s no solid proof that a tablespoon of olive oil before bed delivers enough melatonin to impact sleep.