While oral ingestion of vitamin C is beneficial for overall health and your immune system, its absorption rate is low, thereby resulting in low bioavailability in skin. As a result, a topical application of vitamin C serum can be effective.
When consumed orally, vitamin C is distributed to the gut, followed by the remaining tissues throughout the body. By the time it reaches the skin, the body’s outermost organ, there are very low levels of vitamin C left for absorption into skin. Topical vitamin C serum (vitamin C antioxidant) application is favored in dermatology, as it delivers meaningful levels of vitamin C directly to the source.