Carotenoids in the Skin and Immune Aging

Inclusion Criteria: * Willing and able to provide written informed consent * Age 18-30 years OR 65 years and older * Healthy individuals without uncontrolled medical conditions (over the counter inhaled and topical steroids allowed) * Fiitzpatrick I-VI (all skin types) Exclusion Criteria: * Pregnant or breastfeeding * uncontrolled medical conditions * Skin conditions on the upper extremity that would interfere with skin measurements of carotenoid levels such as active atopic dermatitis or psoriasis * Concurrent use of medications that affect the immune system, within 4 weeks of enrollment (eg. prednisone, biologics, methotrexate, rapamycin, prescription topical steroids, prescription inhaled steroids, others) * Unable to follow study protocol