Information specifically on a Cosgenic Naturals Face Serum Brightening 30ML is limited. The search results show that Cosgenic Naturals primarily sells various essential oils, soaps, and other natural-based products, but a direct listing or detailed information for a 30ML Brightening Face Serum is not immediately available.

However, based on the product name and the brand's profile, here is what can be inferred about a serum of this nature:

General Characteristics (Inferred)

A "Brightening Face Serum" in a natural skincare line like Cosgenic Naturals would likely follow a common formula centered around powerful natural brighteners.

Size: 30ML is a standard size for facial serums.

Primary Goal: To improve skin radiance, reduce the appearance of dark spots, pigmentation, and uneven skin tone.