My skin feels tired and drenched out whenever i stay long under the sun.The sun rays pierce my sensitive skin and when i return home from biking ,i find my skin develop a darker tone.I feel sad ,as i have been using sunblocks for my skin ,but they dont last for a long time. They wear off till their time lasts. Then my cousin told me to use Cynergy tk . so what role will cyergy tk plays in defending my arms,legs and face against the sharp rays of sun exposure .What effect does these hot streams of light internally ? any product that includes cynergy tk as a sunscreen? Give me the name of these products. It will make me regain my original skin tone once again!.