Compare the Skin Barrier Repair Function of Two Ceramide Containing Moisturizers

Inclusion Criteria: * Those who volunteer to participate in the trial, sign the informed consent, be able to cooperate with follow-up observation, and conduct the trial according to the guidance of the doctor. * Dry skin subjects with symmetrical distribution of forearm flexion diagnosed by a doctor. * Those who are 30-80 years old, male or female. * Those with good compliance who can not use other external drugs during the entire observation period. Exclusion Criteria: * Those who do not sign the informed consent. * Those with the history of allergies to test product and control product ingredients. * Those who received or are receiving medical or physical therapy for any skin or systemic disease recently (≤3 months) * Those who have a large amount of exudation in the acute phase or who are infected at the test site. * Female subjects who are preparing for pregnancy, pregnancy, lactation, or within six months after delivery. * Those who participate in clinical trials of other moisturizing products or emollients. * Those who are taking other oral medicines that affect the skin condition. * Those who the investigator considers unsuitable for other reasons.