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After awhile, hydroquinone starts to darken in the jar. Is this harmful? Does it lose it's effect?

Responses (1)

suzanne66 4 Oct 2009

No, this is not harmful and it will not lose its effect. The manufacturer states that a slight darkening of hydroquinone preparation(s) is normal and will not affect potency.
Make sure that you store hydroquinone topical at room temperature away from moisture and heat.

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