I started this product two months ago and am noticeably benefitting from it. My hair is more manageable and looks shiny as never before. My nails are stronger and always look good. The dark sun spots on my cheeks are fading and shrinking. I feel less anxiety than before. I have more mental and physical energy than ever, so I feel younger. I plan to continue to take UMAC Core for many more months, if not years. It is worth the cost.