What to look for in a vitamin C serum Form: L-ascorbic acid Concentration: 10% to 20% Ingredient combo: L-ascorbic acid, tocopherol (vitamin E) or glutathione, ferulic acid Packaging: dark or tinted glass bottles with airless delivery Price: not a factor in quality, but opt for the brand that fits your budget Form Vitamin C can appear on the ingredients label under several different names, but the one you want is L-ascorbic acid, which is the most studied and effective
References Burns A
Trimarchi, Francesco (2003): Successive thyroid storms treated with L-carnitine and low doses of methimazole
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Nevertheless, reports are available on the efficient Pro-metal, GSH-metal or Pro-GSH-metal sequestration, scavenging of ROS-types and also on the maintenance of reduced cellular redox environment by GSH (Anjum et al., 2010, 2012a