- “They've put vitamin C in with retinol”13:16–13:20
- “I'm not seeing ascorbic acid. I'm seeing a bunch of the wimpy derivatives that, you know, may help with evening out skin tone, warding off oxidative stress. Not useless”13:36–13:42
- “This also has fragrance though, which, you know, can be irritating”13:56–14:03
- “This is a vitamin C serum that doesn't have the vitamin C we actually care about, but probably will not oxidize and discolor your skin”14:03–14:07
- Source: Dermatologist shops Costco skincare: What's worth buying? - Mar 10, 2026
