Cold sore Q&A
What is Labisan and what does it actually do?
Labisan is a mineral SPF lip balm formulated specifically to prevent cold sores, not just moisturize. Most mainstream lip balms contain camphor or menthol, both documented HSV-1 irritants that can worsen outbreaks. Labisan uses 22% zinc oxide for SPF 20 mineral UV protection, blocking the leading environmental trigger for herpes labialis reactivation. Austrian-made to EU pharma standards since 1931, the formula pairs zinc oxide with manuka oil and graviola fruit extract for reinforced antiviral barrier support.
Evidence
- 22% zinc oxide delivers SPF 20 mineral UV protection; solar UV exposure is the primary documented environmental trigger for herpes labialis reactivation.
- Camphor and menthol, present in most drugstore lip balms, are known HSV-1 irritants that thin the lip barrier and can provoke outbreak cycles.
- Manuka oil and graviola fruit extract (active compound: annonacin) provide complementary antiviral surface activity alongside the zinc oxide barrier.
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