Bis-Methane

Bis-Methane is a chemical UV filter used in sunscreens and photoprotective skincare products. It works by absorbing ultraviolet radiation and converting it into heat, which is then released from the skin. Chemical filters operate differently from physical (mineral) filters, which sit on the skin's surface and reflect UV rays.This ingredient is formulated into products specifically to provide broad-spectrum protection against both UVA and UVB radiation, which can cause sunburn, premature ageing, and increase skin cancer risk over time.

Bis-Methane functions as a chemical absorber by accepting UV photons and exciting electrons to a higher energy state. Once excited, these electrons release the absorbed energy as heat rather than allowing the UV radiation to damage skin cells. This happens at the molecular level within the formula, before UV rays reach living skin tissue.The ingredient is designed to remain stable in sunlight and continue functioning throughout sun exposure, though like all chemical filters, its protective capacity may diminish over time and with water exposure, which is why reapplication is recommended.

Apply sunscreen containing this filter generously to all sun-exposed areas at least 15 minutes before sun exposure, and reapply every two hours or immediately after swimming or heavy sweating. Bis-Methane works best as part of a complete sun protection routine that includes seeking shade during peak UV hours (11am–3pm) and wearing protective clothing where practical.

Bis-Methane is approved for cosmetic use in sunscreen formulations. Some chemical UV filters can cause irritation in sensitive individuals or rarely trigger allergic contact dermatitis; patch testing is sensible if you have a history of filter sensitivity.