1. The recommended daily dose of collagen for everyone is 5- 10 mg.

2. It is suggested that vitamin C should be supplemented, because vitamin C is the catalyst of glue and promotes the formation of protein. If the body's vitamin C content is insufficient, the benefits of collagen supplementation are limited.

3, collagen should be taken on an empty stomach. Generally speaking, if you don't have the habit of eating midnight snack, there should be no food residue in your stomach when you wake up in the morning, and the food you eat is best absorbed at this time. Therefore, it is best to eat before breakfast. If you miss breakfast time, you have to choose other fasting times.