Evidence check: BDNF in the context of skin aging

The provided context does not contain specific information on BDNF in relation to skin aging. BDNF (Brain-Derived Neurotrophic Factor) is primarily known for its role in neuronal plasticity and survival. A direct, evidence-based link to skin aging or collagen production is not supported by the given sources. The SNPs mentioned in the context (MTHFR, ACE, FTO, CXCL8) address other biological pathways. Without dedicated studies connecting BDNF to dermal processes such as collagen synthesis, elasticity, or photoaging, any claim remains speculative. For collagen optimization, established factors include adequate protein intake, vitamin C, sun protection, and a healthy lifestyle. Genetic testing for BDNF in this context is not currently evidence-based.