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Glutathione is different: It carries enough zip to not only recharge itself but also to resuscitate other spent antioxidants, including vitamins C and E, explains Leslie Fuller, ND, associate dean at the National College of Natural Medicine in Portland, Ore

The seed oil of Evening Primrose (Oenothera biennis) provides gamma-linolenic acid (GLA), an essential omega-6 fatty acid

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When it comes to vitamin C serums, a 25% concentration (this one comes in the form of tetrahexyldecyl ascorbate, a highly stable form of vitamin C that's in the same family of L-ascorbic acid) is probably the most I've tried in a product