Acetyl L-Carnitine is much more efficiently absorbed form of L-Carnitine, a natural amino acid found in meats and dairy product. Acetyl L-Carnitine plays a vital role in the metabolism of fats to energy. Acetyl L-Carnitine is great for replenishing energy post workout. Studies have shown a positive impact on immune function, testosterone regulation, mood enhancement and mental alertness. Anti-aging studies have shown a significant increase in myocellular energy production and healthy cardiovascular function.