How are IgG and skin aging related?

The direct relationship between IgG and skin aging is not addressed in the provided context. Generally, IgG antibodies are involved in immune responses, and chronic inflammation mediated by IgG could theoretically contribute to skin aging via collagen degradation. However, no specific studies or mechanisms are given in the context. Therefore, the evidence is marked as unclear. Consumers should not interpret IgG tests as standalone markers for skin aging, as clinical validity is uncertain.