Chamomile flower extract concentrates the active compounds found in German chamomile (Matricaria chamomilla), particularly apigenin and bisabolol. The extraction process boosts the amount of these constituents compared to what you get from plain dried flowers.
People take it to encourage a sense of calm and ease occasional tension. Some use it before bed to support relaxation. The extract offers more consistent dosing, though how a person responds can still vary.
Do not take chamomile during pregnancy. It may stimulate the uterus. Avoid it while breastfeeding as well, since its compounds can pass to the infant. If you take blood thinners like warfarin or use sedatives, speak with a healthcare professional first. Chamomile can interact with those drugs.