Leucine Amino Acid is one of the best essential amino acids for stimulating muscle strength and growth and also referred to as a BCAA (brand-chain amino acid). Leucine helps regulate your blood sugar by moderating insulin into the body during and after exercise and can even help prevent and treat depression by the way it acts on neurotransmitters in the brain. seaweed, pumpkin, peas and pea protein, whole grain rice, sesame seeds, watercress, turnip greens, soy, sunflower seeds, kidney beans, figs, avocados, raisins, dates, apples, blueberries, olives and even bananas