Wheatgrass powder comes from young leaves of the wheat plant (Triticum aestivum). Growers harvest the leaves at the sprout stage, before the grain forms. They juice the leaves and dry the juice into a fine powder.
The powder provides chlorophyll, antioxidants, and vitamin K. Some users take it for energy, immune support, and general cleansing. Evidence for these uses comes mostly from personal reports and small studies, not large trials.
Many people mix it into water, juice, or smoothies. Taking it on an empty stomach may speed absorption. The taste is strong and grassy. Vitamin K in the powder can interact with blood thinners like warfarin. Trace gluten may be present, so avoid it if you have celiac disease or a wheat allergy. Talk to a healthcare provider before using if you are pregnant or breastfeeding.