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A member asked:
Can 2% hydroquinone be as effective as 4% just over a longer period of time, or is it not possible to ever see the same results? treating dark circles
A doctor has provided 1 answer
In general: the higher percentage concentration will be more effective ... you can't really make up effectiveness with a lower concentration applied over a longer period of time. I understand the 2% strength is available over the counter without a prescription which is probably the basis for your question. The higher 4% strength will be available by prescription; consider making an appointment.
Answered 3/26/2017
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