Is FADS1 useful for Haut?

The question of whether FADS1 is useful for skin requires a nuanced answer. FADS1 encodes delta-5 desaturase, a key enzyme in polyunsaturated fatty acid metabolism. Variants in FADS1 (e.g., rs174547) influence the conversion of alpha-linolenic acid to EPA and linoleic acid to arachidonic acid. These fatty acids are critical for skin barrier function, inflammation regulation, and cell membrane integrity. There is moderate human evidence linking certain FADS1 variants to increased risk of atopic dermatitis and dry skin. However, effect sizes are small, and clinical utility for personalized diet or skincare recommendations remains unclear. A MyBody-X DNA test provides this genetic information but does not constitute a skin diagnosis. Without accompanying biomarkers (e.g., blood fatty acid profile) and medical evaluation, one should not make drastic dietary or supplementation changes based solely on this result. Evidence grade: human-moderate. Caveat: The association is not strong enough to predict or treat skin conditions from genotype alone.