The present invention relates to a wrinkle-improving cosmetic composition comprising fucoxanthin, and more particularly, to the present invention by separating and purifying fucoxanthin from adherent diatoms taken with Jeju lava seawater and using it as a wrinkle-improving cosmetic composition. . The present invention relates to a cosmetic composition containing fucoxanthin as an active ingredient in that high-purity fucoxanthin separated and purified by an optimal method from adherent diatoms taken from Jeju lava seawater in Korea has an effect of improving skin wrinkles. It can be used in various industries such as the beauty field.
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