The Ordinary Product Conflicts If two products conflict, it usually means they may: Reduce each others effectiveness Increase the risk of irritation In many cases, conflicting products can still be used safely by applying one in the morning and one in the evening, or by alternating days
The temporary blue discoloration some users experience isn't hyperpigmentation but surface staining from copper ions, which washes off easily
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Citations [1] Khavinson V, Diomede F, Mironova E, et al
One GSTZ1 encoded protein lacks the glutathione binding site and is, therefore, unlikely to exhibit the enzymatic activity of the other three isoforms