Doctor's Best® Sustained Plus Immediate Release L-Arginine is a nutritional supplement suitable for vegetarians that contains the essential amino acid L-Arginine in a double layered tablet – 500 mg of continuous release and 500 mg of instantaneous release L-arginine – to enhance the blood levels of this nutriment.

Many forms of supplemental L-arginine are immediately absorbed into the blood circulation and, therefore, only provide a brief boost to L-arginine amounts. Doctor's Best® Sustained Plus Immediate Release L-Arginine is produced not only to instantly boost blood levels of L-arginine, but also to maintain these improved levels for a further 8 hours.

L-arginine has been shown to help the cardio-circulatory system, encourage dynamic heart functioning and improve healthy circulation through the body with its conversion to nitric oxide. Studies also show that added L-arginine can also be beneficial for a regular sports routine.