The Application segment of the Glycogen Metabolism Disease Drug market is defined by the specific glycogen storage disorder that each therapeutic candidate targets. Primary applications include Pompe disease, McArdle disease, Cori disease, and a residual category labeled Other glycogen storage disorders. Each application contributes uniquely to market size: Pompe disease, representing the most prevalent phenotype, commands the largest share of research funding and commercial sales, driving the bulk of revenue. McArdle disease, while less common, sustains a distinct pipeline of enzyme‑replacement and gene‑therapy products, adding measurable volume. Cori disease occupies a mid‑range position, with a focused set of small‑molecule modulators. The Other category aggregates rare sub‑types, collectively supporting niche market activity that, although modest, is essential for comprehensive market coverage. This Glycogen Metabolism Disease Drug segmentation clarifies how therapeutic focus aligns with epidemiological prevalence, regulatory incentives, and pricing dynamics, thereby shaping the overall market valuation.