A disadvantage of collagen is that it is extremely expensive and short-lived. There is also a problem with reabsorption. The body has to be stimulated to reabsorb collagen and can only reabsorb a certain amount. What is not reabsorbed tends to roll off and collect underneath the skin. Aged skin layers.
Fat injections are an alternative to collagen.
About 2 to 3 percent of the population is allergic to bovine collagen. Fat, on the other hand, comes from your own body, so you cannot be allergic to it. There s an ample supply of fat and it is relatively easy to extract. It can be used in the same areas in which collagen is used. The disadvantage is that it takes a bit longer to prepare.