Vitamin
C (L-Ascorbic Acid)Vitamin C is one of the body's primary protectants from
reactive oxygen damage, but it is depleted during ultraviolet injury. Vitamin C
serves as the major aqueous phase antioxidant in skin. It not only neutralizes
reactive oxygen species destructive to the skin but also actively recycles
vitamin E, which serves to protect lipids and cell membranes from these
oxidative insults. Human beings cannot synthesize vitamin C; they must ingest
it, and body control mechanisms limit absorption and subsequent delivery to
tissues. Skin comprises about 8% of body tissues and gets approximately the
same amount of oral vitamin C. Half-life after ingestion is 12 to 20 days.Topical
L-Ascorbic AcidThe Duke-patented technology solved the problem of how to
stabilize the very unstable molecule, l-ascorbic acid, and get it into skin,
which usually is an excellent barrier to foreign substances.2 L-ascorbic acid
has been formulated in high concentration in a stable aque...
