Ashwagandha

Useful for: Stress and anxiety. It might also help with insomnia, but don’t expect it to knock you out on the first night.

What’s the dose? Studies tend to use 300mg twice a day for at least six weeks. Take note: Don’t expect many benefits from adding it to a smoothie at the juice bar; you need it every day for several weeks for it to work. Be careful if you’ve had a hormone-sensitive illness such as prostate cancer, as this herb may affect hormone levels.