Used topically Vitamin C is an excellent skin brighter, antioxidant and anti-inflammatory. It can be used easily alongside other active ingredients especially Retinoids, Ferulic Acid and Vitamin E.
It is known to stimulates fibroblast cells required for collagen synthesis to help support the skin's structure and acts as an anti-inflammatory. It prevents the production of free radicals that trigger melanogensis and also has a photoprotective effect, preventing the absorption of both UVA and UVB radiation.
L-Ascorbic Acid (LAA) - most common form found in skincare products
Magnesium Ascorbyl Phosphate
Tetraisopalmitoyl Ascorbic Acid
Percentage in Skincare:
Up to 20% although 10-15% is commonly used OTC. Any more is likely to cause irritation.
Vitamin C is generally a very unstable ingredient and can oxidise very easily. It needs to be packaged in airtight containers and stored away from direct sunlight and exposure to air.
High concentrations can lead to irritation for some.
High concentrations known to oxidise in larger pores causing perceived blackheads for some.