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Factory Bulk Price Natural Theanine Green Tea Leaf L-Theanine. High Purity Content: Active substance content exceeds 90%, with purity up to 99%. Natural Source: Sourced from natural green tea leaves for authentic L-Theanine. Multiple Certifications: Certified by ISO9001, Halal, Kosher, and GMP standards. Fast Delivery: Stock items delivered within 3-5 business days after payment. OEM/ODM Services: Custom packaging and manufacturing services are available. Free Sample Policy: Free samples available, customer pays shipping cost. Quality Guarantee: Free replacement or refund for verified quality issues. Long Shelf Life: Product shelf life exceeds 12 months with 2-year retest date.