For individuals such as athletes or fitness enthusiasts, only when the exercise intensity is very high, leading to a significant amount of energy expenditure within a certain time frame and a larger "flow" of fat oxidation for energy production, is there a possibility (supported by many research studies, though some also negate it) of a "relative deficiency" in L-carnitine synthesis. In such cases, taking additional L-carnitine can expand the scale of the "transport fleet" (carrier), delivering more "bricks" (fatty acids) to the construction site (mitochondria) within a unit of time, which evidently aids in oxidizing and burning more fat. Therefore, L-carnitine supplementation may only be beneficial for weight loss when exercise intensity is relatively high.