Can tTG IgA help with skin aging?

tTG IgA (tissue transglutaminase IgA) is a well-established serological marker for celiac disease, not for skin aging. There is no direct evidence linking tTG IgA levels to skin aging processes such as wrinkle formation, loss of elasticity, or collagen degradation. While untreated celiac disease can indirectly affect skin health through chronic inflammation and nutrient deficiencies (e.g., zinc, vitamin D), this does not constitute a specific anti-aging biomarker. Using tTG IgA to assess or guide skin aging interventions is not supported by current science. For skin aging assessment, validated methods include clinical scoring, skin biopsy, or biomarkers like advanced glycation end-products (AGEs) and matrix metalloproteinases. Evidence: unclear/mechanistic. Caveat: tTG IgA testing is only indicated for celiac disease screening; positive results require gastroenterology follow-up.