The human body contains collagen, but the collagen may dissipate with age. Generally, after 25 years old, the collagen in the body will be lost, which is why people's skin is no longer smooth, bright and elastic after middle age. Regular injection of collagen can maintain the collagen content in the body and ensure the body needs. There are also many injectable parts of collagen.

Is collagen allergic? Generally speaking, collagen is an original substance in the human body and is not allergic. However, there are * a few people who are allergic to protein. These people may have allergic symptoms of red spots after taking collagen. At this time, as long as you stop taking collagen immediately, there will be no problem.
Will collagen get fat: just taking high-quality collagen will not make you fat, but because the taste of collagen is not enough, some liquid collagen, such as collagen oral liquid, may be added with sweeteners or fruit flavoring agents and other additives to make the product taste better.
In most cases, collagen used for beauty is a biological material extracted from other organisms, which has the same effect as collagen in human body. Usually, collagen can be injected into the chest, face, nose, etc. But please note that before collagen injection, please check whether your body is allergic to skin and confirm whether you can accept collagen injection.