Please help: How do I tell if Obagi C serum has gone bad?

poocatgrrl

Well-known member
I got some from my first Test Tube sampling delivery (1.0 oz bottle) and have been using it (over half gone now).

It doesn't smell any different or anything, but it is a light yellow color and for some reason I think it was clear at first, but I honestly can't remember now. Maybe it has always been this color?

Can someone help me out? TIA!
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