One the best brain-boostng supplements, NOW's Acetyl L-Carnitine may be your best all-around option for promoting better memory, concentration, mood and alertness. Although not a stimulant itself, acetyl l-carnitine plays a specific role in energy production within brain cells and neurons. Increasing energy levels within the brain benefits all brain functions. Acetyl L-carnitine (also known as ALCAR) has been extensively studied and is very safe to use. ALACR can be incredibly useful to the elderly, students, teachers, attorneys, trainers, or anyone else who needs maximum mental energy and focus without the complications of caffeine and stimulants. Most people need to experiment a little to find out what dose works best. We suggest starting with 1000-1500 mg (2-3 capsules) taken on an empty stomach in the morning immediately followed by a breakfast that includes protein and healthy fats such as lecithin. Since acetyl L-carnitine is one of the most expensive supplement ingredients, you'll definitely want to go with a dependable brand like NOW Foods.