According to ayurveda, jamun vinegar primarily acts on kapha dosha and reduces it. It can increase pitta dosha, so it should be best to avoid it in excess amount if you have any increased pitta symptoms.
Patanjali jamun sirka is a good source of iron, used as a real medicine for diabetes, liver trouble, and heart problems. It enhances the immune system.
Patanjali jamun vinegar is a rich source of vitamin a and vitamin c. Its polyphenolic compounds are effective against cancer, heart diseases, asthma, dysuria, and arthritis. 
Patanjali jamun vinegar is a wonderful medicine for digestive system related problems like flatulence, abdominal pain,  gastric problems, abdominal distension, bloating, diarrhea, and dysentery.

Jamun Pulp (Syzygium cumini L. Skeels).

Mix 10 to 20ml of vinegar with water and consume after meals or as directed by the physician.

Best Before-12 Months from Manufacturing Date.