L-DOPA (levodopa) is the amino acid precursor of dopamine that crosses the blood-brain barrier and is converted to dopamine in the brain, used as the cornerstone pharmacotherapy for Parkinson's disease, always co-administered with a peripheral decarboxylase inhibitor. Simson Pharma's L-DOPA reference standard and impurities support compendial testing across levodopa-containing formulations.

Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) supply high-quality Dihydroxyphenylalanine Reference Standards, pharmacopoeial reference materials, and its related impurities to pharmaceutical manufacturers, CROs, analytical laboratories, universities, and regulatory organizations worldwide. To service the Europe and America market efficiently, Simson Pharma Limited has set up Simson Pharma Global Ltd. in United Kingdom and Simson Pharma Global LLC in USA respectively.