26. Barley Grass Powder
Barley grass powder is rich in several sleep-promoting compounds, including GABA, calcium, tryptophan, zinc, potassium, and magnesium. According to a 2018 research review, barley grass powder may promote sleep and help prevent a range of other conditions. People can mix barley grass powder into smoothies, scrambled eggs, salad dressings, and soups. It is available in some food stores and online.
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