The Effect of Cosmetic Formulations on the Appearance of Grey Hair.

Inclusion Criteria: * Healthy Female or Male between the ages of 25 and 60 years old, both inclusive at the time of consent. * Of any race and ethnicity. * Able to read and understand all study instructions and any other relevant study documents and understand the test procedures (in English) and able to provide a free decision about participating in the study. * Has 15 - 35% naturally gray hair * Available to come to all study visits. Exclusion Criteria: * Individuals with any relevant past or present medical history which may affect the study results or may lead to increased risk to the participant in the judgement of the Investigator or designee, including a history of cancer, insulin-dependent diabetes, acute or chronic renal insufficiency, chronic inflammatory disorders (arthritis, osteoarthritis, inflammatory bowel disease, colitis, etc.), asthma (not including exercise-induced asthma), epilepsy, uncontrolled hyperthyroidism, or uncontrolled hypothyroidism. Participants who have well controlled hyperthyroidism and hypothyroidism (stable medication for greater than 6 months) will be permitted. * Pattern hair loss (Savin ≥ 2 for females, or Hamilton-Norwood ≥IV \& excluding vertex hair loss for males) or any history of hair loss for medical reasons, including, but not limited to, alopecia areata, alopecia universalis, alopecia totalis or telogen effluvium. * Individuals that are sensitive/allergic to any of the ingredients in any of the test products adhesives, tattoo …