Collagen Treatment for Dark Circles?

First of all, we’d recommend getting an assessment to determine the type of dark circles you have, because the treatment depends on the underlying cause.
In cases where the under-eye skin is thin and the blood vessels show through, we often recommend collagen-boosting treatments rather than traditional fillers. For the delicate under-eye area, we prefer collagen boosters with very small particles to avoid lumps or swelling. In Korea, a commonly used brand for this purpose is Ultracol, which helps build up collagen and naturally thicken the skin, reducing the see-through effect and improving the overall under-eye appearance.

Some clinicians will use Collagen injections to treat undereye circles.  I would recommend a topical regimen, followed by a MelaPeel as an adjunct to hyaluronic acid fillers. 

Collagen creams do not help. Collagen injections are not performed any more, except for Evolence which is a pig collagen, but is too thick to inject underneath the eyelid skin in general. Dark circles are hard to treat. Some creams that help change the iron from the blood cells are hypothesized to work; but, some patients improve and others don’t.