All you need is good hygiene and good hydratation, sun cream is also a must with aging otherwise you may develop age spots.
Unless you have a special situation of extra dry skin or very oily one.
All the rest is marketing. You may do the rain dance and at one point it will rain. Is it really the dance which did it???
Retinol is converted in retinoic acid , a powerful morphogen. Nothing to play with, unless there is so little quantity that it will have no effects.
Retinol, also known as Vitamine A, is to be avoid by pregnant woman as it could interfere with normal foetus development. The native form is found in carotene, so eat carrots if you wish, save your money and go see a psychologue in need.