Not good. According to the query of weight loss medical information, Beijing Tongrentang Yifushou L-carnitine coffee will have a negative impact on people's health. The harms of L-carnitine include the following:

1. It causes excitement. People with poor heart function or poor sleep quality who consume L-carnitine may have a fast heart rate or even insomnia.

2. Cause dizziness, headache, increased blood pressure, etc.

3. Cause irregular heartbeat, palpitation, angina, shortness of breath, and even life-threatening harm.