http://www.naturemade.com/supplements/melatonin/melatonin-200-mg-ltheanine#UbvWURYImuRx5PCG.97 Day 226 has 35 protein-coding genes (browser view) including MTNR1B (melatonin receptor 1b).
The more famous melatonin receptor, MT1, is in the brain, but MTNR1B encodes part of receptor MT2, which is in the retina. It may improve vision at night.
Click here to see all 8442914 letters of Day 226 with MTNR1B underlined.