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Questions and Answers
What is the primary function of Mexoryl SX in sunscreens?
What is the primary function of Mexoryl SX in sunscreens?
- To reflect UV rays
- To enhance skin penetration
- To provide UVA2 protection only
- To absorb UV rays and release them as thermal energy (correct)
What is the limitation of Mexoryl SX in terms of UV protection?
What is the limitation of Mexoryl SX in terms of UV protection?
- It is not water-soluble
- It only provides protection against UVA1
- It is not photostable
- It doesn't protect against the entire UV spectrum (correct)
What is the main difference between Mexoryl SX and Mexoryl XL?
What is the main difference between Mexoryl SX and Mexoryl XL?
- Mexoryl XL is not photostable
- Mexoryl XL is not approved by the FDA
- Mexoryl XL is used synergistically with Mexoryl SX (correct)
- Mexoryl XL is water-soluble
Why is Mexoryl SX not sufficient as a single ingredient in sunscreens?
Why is Mexoryl SX not sufficient as a single ingredient in sunscreens?
What is the benefit of Mexoryl SX being water-soluble?
What is the benefit of Mexoryl SX being water-soluble?
What is the current status of Mexoryl XL in the US market?
What is the current status of Mexoryl XL in the US market?
What is the primary advantage of using Mexoryl SX and Mexoryl XL together?
What is the primary advantage of using Mexoryl SX and Mexoryl XL together?
What is the patent status of Mexoryl SX?
What is the patent status of Mexoryl SX?
What is the primary difference between Mexoryl SX and other chemical filters?
What is the primary difference between Mexoryl SX and other chemical filters?
Why is Mexoryl SX used in combination with other filters?
Why is Mexoryl SX used in combination with other filters?
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Study Notes
Chemical Filters
- Avobenzone: absorbs full UVA spectrum, oil-soluble, tends to be unstable when combined with octinoxate, but can be stabilized by octocrylene, 4-MBC, Tinosorb, Meroxyl SX, and other UV filters or photo-stabilizers.
- Helioplex: a combination of avobenzone and oxybenzone, offering broad-spectrum protection and stability, but not water-resistant, held by Neutrogena, and FDA-approved.
Octinoxate
- Octinoxate: absorbs UVB rays, water-insoluble, degrades over time when exposed to sunlight, can be stabilized by other UV filters such as Tinosorb M.
- Also known as octyl methoxy-cinnamate (OMC), ethylhexyl methoxycinnamate (EHMC), and other names.
Octocrylene
- Octocrylene: absorbs UVB and UVA2 rays, oil-soluble, absorbed by skin, can increase skin's photosensitivity to the sun, increasing free radicals.
- Photostable and helps stabilize other UV filters.
Mexoryl SX
- Mexoryl SX: absorbs UV rays, releases thermal energy, doesn't protect against the entire UV spectrum, and has to be combined with other filters for good protection.
- Also known as terephthalylidene dicamphor sulfonic acid (TDSA) and ecamsule, FDA-approved.
Mexoryl XL
- Mexoryl XL: absorbs UV rays, oil-soluble, photostable, used synergistically with Mexoryl SX, not yet FDA-approved.
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