“液体口罩”来了，防护效果究竟如何

Market Overview - The "liquid mask" has emerged as a new protective product, available in spray, lotion, or gel forms, designed to create a protective film in the nasal cavity to block pathogens, dust, and allergens [2][3] - Various brands of "liquid masks" are available on platforms like Taobao, with significant price differences; for example, a brand priced at 50 yuan for 30 grams can be sprayed approximately 300 times, while another at 270 yuan for 20 milliliters offers around 160 sprays [2] Product Claims - Some vendors claim that "liquid masks" contain lgM nano-immunoglobulin, providing "invisible protection" with a 99.9% blocking rate against respiratory viruses, positioning it as a more effective alternative to traditional masks [3] - To enhance credibility, certain sellers present 24-hour in vitro activity test results and various "authoritative testing reports" asserting the product's ability to "precisely combat viruses" [3] Expert Opinions - Experts caution that "liquid masks" should not be considered primary protective gear; they are classified as "ordinary daily necessities" and lack reliable clinical evidence for virus prevention [4] - The core function of traditional masks is to block the inhalation and exhalation pathways of respiratory diseases, which "liquid masks" do not effectively replicate [4] - In high-risk environments, such as hospitals or crowded places, the use of compliant masks is essential for effective disease prevention [4]