Betweendots
Oily/Sensitive
I only tried the Ordinary and it was very mild product. I think 20% will be the most effective since all these are serums so their bioavailability should be similar.
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Betweendots
Oily/Sensitive
In general, azelaic acid won't be as powerful as glycolic acid (it's due to molecule size). We don't have azeclair, in my country most popular azelaic acid from pharmacy is skinoren.
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