vitamin c plus glutathione serum No.5+ Concentrated Potent 25% vitamin C targets stubborn discolouration and sun damage Glutathione minimises irritation and boosts skin’s antioxidant supply GAP technology reduces oxidative stress and targets discolouration Lightly hydrating serum for all skin types Paula's Choice 25% Vitamin C

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You'll often see it paired with boosters like Ethylhexylglycerin

Its promising, and in 10 years we might say, Hey, this stuff is great, what youre giving is pure and safe. But right now, its just so unregulated that we just dont know what these things really do in the human body, Spittler said

It plays integral roles in: Immune regulation Cancer suppression (anti-proliferative and pro-apoptotic signaling) Mitochondrial function and redox balance Hormonal feedback loops, including cortisol and estrogen/testosterone rhythms Aging diminishes melatonin output by up to 75%, leading to weaker circadian cues and downstream systemic dysfunction

Methylpropanediol is able to add a bit of moisture to the skin

10.1111/j.1365-2125.2012.04172.x 3 DrmicD.KolencD.IlicS.BaukL.SeverM.Zenko SeverA.et al (2017)