Global Biguanides Market By Dosage Form (Immediate-release Tablets, Extended-release Tablets, Fixed-dose Combinations (FDCs), and Oral Solutions/Others), By Type (Metformin and Other Biguanides), By Application (Type 2 Diabetes, PCOS/Endocrine & Metabolic Off-label, Weight Management, and Emerging R&D and Other), By Distribution Channel (Retail Pharmacies, Hospital/Institutional, Online/Mail-order, and Other Care Settings), By Region and Companies – Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2026–2035