The Klinefelter Syndrome Therapeutics segmentation by application distinguishes four primary use‑cases: Hormone Replacement Therapy (HRT), Fertility Restoration, Cognitive & Behavioral Support, and Adjunctive Care. HRT, which addresses hypogonadism in the majority of patients, drives the largest share of revenue, reflecting its broad prescribing base and long‑term treatment cycles. Fertility restoration—encompassing sperm retrieval, assisted reproductive technologies, and emerging germ‑cell therapies—captures a substantial portion of the market due to high patient demand for biological parenthood. Cognitive and behavioral support, including neurostimulants and psychosocial interventions, contributes a modest but growing segment as awareness of neurodevelopmental impacts rises. Adjunctive care (e.g., bone health, metabolic management) rounds out the portfolio, representing the residual market share. The accompanying pie chart quantifies these contributions, illustrating how each application underpins the overall market size.