First of all, let's learn about the efficacy of L-carnitine. The main physiological function of L-carnitine is to promote the conversion of fat into energy. Taking L-carnitine can reduce fat and weight without reducing water and muscle. This is the role that many dieters dream of, so this product must be useful for those who want to lose weight. But there are still many L-carnitine products on the market now, and there are many brands to choose from, so you can know each brand carefully and clearly know that buying is a responsible attitude towards your health. If you want to know whether L-carnitine is useful, you should not only know the efficacy, but also know how to use L-carnitine. Of course, questions about usage and dosage can be easily obtained from the product manual, so after you buy the product, you still need to read the product manual at the first time to see what taboos you need to know about the product. To sum up, you should know whether L-carnitine is useful or not. A health care product must have its function, but the key is how to use it. If you don't have a deep understanding of the product, you may not be able to play the role of the product, so you don't think L-carnitine is useless. This judgment is too subjective.