Petroleum Jelly / Vaseline / White Petrolatum
One of the most effective occlusives in existence — reduces TEWL by up to 98%, more than any other commonly used skincare ingredient. Widely used in dermatology for barrier repair, wound healing, eczema and post-procedure recovery. Does not trap bacteria or worsen acne. A "slugging" technique staple.
PM "slugging": apply thin layer as final step over all other products. Or targeted lip/wound care.
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