Is Östradiol useful for skin aging?

The provided context does not contain direct evidence on whether estradiol is useful for skin aging. Estradiol, a form of estrogen, is known in general research to influence collagen synthesis and skin hydration, but the given knowledge base lacks any studies or data linking estradiol to skin aging outcomes. The evidence from the context is absent; therefore, any claim of usefulness would be speculative. General mechanistic understanding suggests a potential role, but without human trials or observational data in the provided material, the evidence level is unclear. Safety note: Hormonal interventions carry risks (e.g., thromboembolism, hormone-sensitive cancers) and require medical supervision. The context does not support a recommendation.