I-sunscreen kanye namafomula asebenzayo asengozini yokushiswa yi-oxidation, okubangela ukushintsha kombala, ukuhlukaniswa, noma ukulahlekelwa ukusebenza kahle kwe-SPF. Ukupakishwa kubalulekile ekuvikeleni amafomula ezimonyo kanye nemithi ezikhungethweni ezicindezela imvelo ezifana nomoya-mpilo, umswakama, kanye nokuchayeka ku-UV. Izakhiwo zamashubhu eziguquguqukayo ezinezingqimba ezinhlanu zinikeza ukuvikelwa okuthuthukisiwe kwezivikelo, okwenza zibe zilungele imikhiqizo ebucayi njenge-sunscreen, ama-paste okunakekelwa ngomlomo, kanye nokunakekelwa kwesikhumba okusebenzayo kakhulu. I-EVOH (i-Ethylene Vinyl Alcohol) inezela ungqimba oluphakathi lwezivikelo oluvikela ifomula yakho kuyo yonke impilo yayo eshalofini.