Is jambul high in caffeine?

What to know about jambul

Jambul (Syzygium cumini), sold across South Asia as jamun and elsewhere as java plum, is one of the cleaner rows in this database. It grades A for histamine content, tyramine, gluten, lactose, dairy protein, free glutamates, sulfites, nitrites, nickel and nightshades, with only mild B marks for histamine liberation, salicylates and oxalates. Its FODMAP columns are unrated rather than tested low, so a very sensitive gut should still trial it rather than assume. The reason most people search for jambul is not a trigger at all: it is sold hard as a blood sugar remedy, and that claim needs unpicking. The traditional preparation is not the fruit. It is a powder or extract made from the seed, which you would normally spit out, and the seed is where the compounds studied for glucose lowering are concentrated. Animal work does show a hypoglycaemic effect from those seed extracts, but human trials are small, short and inconsistent, and reviewers have repeatedly landed on the evidence being too thin to recommend it as a treatment. If you take metformin, a sulfonylurea or insulin, the concentrated seed supplement is worth naming to your doctor. Eating the fresh fruit is a different and much smaller exposure.