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Organic Skin Care
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Mexoryl SX Definition:
What is MEXORYL™
SX?
MEXORYL™ SX is the most effective organic UV filter that protects against
UVA rays (maximum absorption at 344nm) with high photostability, a key factor
in sunscreen protection efficacy. This high photostability means the sunscreen
will maintain a higher UVA protective ability longer and not degrade as quickly
as other UVA filters when exposed to the sun.
What is photostability?
Photostability means the ability to stabilize under sunlight. The process of photostability
is a key factor in sunscreen protection efficacy. High photostability means the
sunscreen will maintain a higher UVA protective barrier.
Why is MEXORYL™ SX unique?
When UVA and UVB inorganic protective filters were first introduced using cosmetically
acceptable concentrations, they provided minimal protection against UVA rays.
Though the UVA ray filter molecule Avobenzone (Parsol 1789) was approved for drug
store and apothecary use in 1992, it was discovered that when used by itself,
Avobenzone (Parsol 1789) degrades when exposed to the sun, thereby reducing its
UVA protection efficacy.
MEXORYL™ SX, now available in the US, is photostable on its own and is the
most effective organic filter designed to protect against short UVA rays. Formulations
containing MEXORYL™ SX and L’Oreal’s patented photostable association
of Octocrylene and Avobenzone provide a complete broad spectrum UV protection,
with the highest level of protection across the UVA spectrum––particularly
short UVA rays in the range of UVA 320-340nm.
How does MEXORYL™ SX work?
MEXORYL™ SX protects the skin by absorbing the energy of the sun’s
short UVA rays. MEXORYL™ SX acts as a normal filter, but becomes highly
energized by absorbing the energy of a UV photon. MEXORYL™ SX protects against
UVA photons penetrating your skin, deactivates and releases the absorbed energy
to the environment as harmless energy, then repeats the process over and over.
Products that Contain Mexoryl SX:
La Roche-Posay Anthelios SX 15 Moisturizing Cream
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