I ka wā e pili ana i ka mālama ʻili, ʻo ka loaʻa ʻana o nā huahana kūpono no kāu hana maʻamau i kēlā me kēia lā he hana paʻakikī. Me ka nui o nā koho i loaʻa, he mea nui e hoʻomaopopo i nā pono a me ka hoʻohana ʻana o kēlā me kēia huahana e hana i kahi hoʻoholo ʻike. ʻO kekahi o ia huahana i kaulana i nā makahiki i hala iho nei, ʻo ia ka mea hoʻomaʻemaʻe retinol. Ma kēia alakaʻi, e ʻimi mākou i nā pōmaikaʻi, hoʻohana, a me nā ʻōlelo paipai no ka hoʻokomo ʻana i kahi mea hoʻomaʻemaʻe retinol i kāu hana mālama ʻili.