It is precisely because of this second function that some people think that L-carnitine helps to lose weight. But for healthy adults, the human body itself will produce L-carnitine, so for normal healthy people, there is no need for additional supplements.
Of course, there are also some situations that may require L-carnitine supplementation. For example, the first one is that they are born with some genetic problems or diseases, which cause their bodies to fail to produce L-carnitine normally.
The second kind of people are athletes, or people who want to lose weight and exercise a lot at the same time. Theoretically, this L-carnitine can really help to lose weight, because it can make this long-chain fat supply energy faster. So more supplements have the effect of losing weight. But for healthy people, they will also produce this kind of L-carnitine, so it is enough for you to add a little more and produce it yourself, which may not have that great effect.
We can think of fat as bricks. Then, L-carnitine is a truck. When you have enough exercise and your body needs more bricks to build a house, you will have more L-carnitine and more trucks will be useful. If you don't need so many bricks, the L-carnitine produced by your body will be enough.
So, add a few more trucks, and L-carnitine will still stop in your body. So many people who exercise to lose weight, or some athletes, can eat some if they want to lose weight. For ordinary people, eating or not has little effect.
Then the third group is the one with some diseases. L-carnitine can be used as a therapeutic drug, which helps to alleviate the pain of the disease to some extent. Therefore, it is not recommended to supplement L-carnitine if you are not ill and seldom exercise. So I suggest you honestly change your diet and moderately increase your exercise, so that you can lose weight more sustainably and healthily. You don't need these supplements when you are really afraid that you don't have enough L-carnitine. You can make some supplements through a normal diet.