Lavender oil is the most powerful one so far. Diffused, mot drank lol. It is effectively melatonin and smells great. Quality varies a lot, but Young Living make

Lavender oil is the most powerful one so far. Diffused, mot drank lol. It is effectively melatonin and smells great. Quality varies a lot, but Young Living makes really high quality ones. (Yes, I'm aware of the shadiness around YL, but this is one of the good products). A far cheaper alternative is chamomile tea.