Efficacy Testing of Hibiscus Sabdariffa Extract and Collagen Products

Exclusion Criteria

• •Subject who is not willing to participate in this study.
• •Patients with diseases of the skin, liver, kidney.
• •Subjects who have known cosmetic, drug or food allergies, difficulty in digestive tract absorption or disorder.
• •Female who is pregnant or nursing or planning to become pregnant during the course of the study.
• •Received facial laser therapy, chemical peeling or UV overexposure (\> 3 hr/week) in the past 4 weeks.
• •Constant drug use
• •Students who are currently taking courses taught by the principal investigator of this trial.