Skincare DNA: which blood markers matter?

The question of which blood markers matter for skincare DNA tests is valid, but the evidence is weak. Many direct-to-consumer (DTC) tests promote genetic analyses for collagen breakdown, antioxidant needs, or skin aging. However, scientifically robust blood markers include: vitamin D (regulates skin barrier and inflammation), zinc (essential for wound healing and acne), ferritin (iron deficiency can cause pale, tired skin), and CRP (systemic inflammation affecting skin conditions like psoriasis). Omega-3 index and selenium are also discussed. The genetic component (e.g., SNPs in COL1A1, SOD2, GSTP1) is only weakly associated with concrete skin parameters – often based on GWAS with small effect sizes. Clinically valid recommendations cannot be derived from these. A blood test for the mentioned markers provides measurable, actionable values. Conclusion: blood markers are more relevant for skin health than pure DNA tests. The latter are currently more marketing than evidence-based medicine. Consult a dermatologist for skin issues and get targeted blood work.