Should i begin Obagi NU DERM system after using Nadinola cream for past 2 months?

I cant afford the more expensive products so i have been using kojic acid soap and nadinola cream with hydroquinone, and applying cetaphil spf 50+ for the past 3 months but there has been no improvement in my bad skin tone. I stopped using the cream a week ago after a friend of mine offered to get me the Obagi NU DERM system products, i havent used it yet but i'm wondering if its safe to use it since it also has hydroquinone in it. I know prolonged use of hydroquinone can be harmful

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