Vicenin 2 is an angiotensin-converting enzyme (ACE) inhibitor (IC50=43.83 μM) from the aerial parts of Desmodium styracifolium. Vicenin 2 is an inhibitor of α-glucosidase, PTP1B, and RLAR. Vicenin 2 has hepatoprotective, anti-cancer, antioxidant and anti-inflammatory activities, and DTL co-administration is more effective than either of the single agents in androgen-independent prostate cancer. Vicenin 2 might be a useful lead for the development of multiple target-oriented therapeutic modalities for the treatment of diabetes and diabetes-associated complications. Vicenin 2 could act as a UV light barrier to protect the plants.