Your body makes small amounts of dimethylaminoethanol, a deanol that enters the brain easily. Many people pick this form because it tends to be easier on the system than related compounds.
People take DMAE to sharpen focus and sustain mental energy. The mild stimulation works best when you take it early in the day, so it does not mess with sleep. Some apply it topically for skin firmness.
Watch for headache, drowsiness, or tight muscles. Since it pushes cholinergic activity, it could work against anticholinergic meds. Anyone with a seizure condition, bipolar disorder, or already taking cholinergic drugs should check with a doctor first.