The antioxidant function of many animal pigments: are there consistent health benefits of sexually selected colourants?

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Female-specific color is a signal of quality in the striped plateau lizard (Sceloporus virgatus) (2006, background): “…by guest on 27 July 2018 little attention has been paid to the potential costs of pteridinebased pigmentation, pteridines do have important biological functions including antioxidant functions (see reviews by Ortiz and Williams-Ashman 1963; McGraw 2005).”
Oxidative stress as a mediator of life history trade-offs: mechanisms, measurements and interpretation. (2009, background): “The most studied of these are the carotenoids, although many other substances (e.g. melanins, porphyrins and flavonoids) also have this dual role (McGraw 2005).”
Carotenoid-based signals in behavioural ecology : a review (2011, background): “Birds can incorporate phaeomelanins or psittacolfulvins into their plumage (McGraw, 2005), and bare parts of their bodies can be coloured red from haemoglobin rather than carotenoids (McGraw & Klasing, 2006).”
Relating endocrinology, physiology and behaviour using species with alternative mating strategies (2007, background): “Speciﬁc theories of sexual selection posit that carotenoids may be important cofactors in immune function and/or free radical elimination (e.g. superoxide dismutase), and thus bright carotenoid colours could be used as a signal of male quality (Blount et al. 2003; Grether et al. 2004; McGraw 2005).”