Here are some health benefits of these fruits.

Body metabolism
These plums are rich in various organic acids, flavonoids, phenolic acids and antioxidant compounds enabling them to improve body metabolism.

Fatigue
They can alleviate fatigue.

Detoxifier
It has detoxifying properties.

Vitamin A effects
Greengage also contains vitamin A, also known as retinol or carotenoids. Vitamin A is a fat-soluble vitamin that plays a fundamental role in maintaining healthy skin, teeth, soft and skeletal tissue and mucous membranes. Vitamin A also functions as an eye pigment fundamental in night or low light conditions.

Body maintenance
The star fruit is a good source of vitamin C, which is essential to the health of your body, as it helps in maintaining bones, teeth, mucus membranes, and skin and improves the immune system.

Heart health
The phenolic acids and flavonoids present in the fruit are supposed to possess heart-protecting function. The potassium content is also an important component of cell and body fluids help regulate heart rate and blood pressure. Greengage is also used in alternative medicine to treat and aids the following illness.

Diabetes
The fruit contains a high count of natural sugar, so diabetics can consume it freely.

Anti-aging
It also contains vitamin B and A, helping the immune system fight disease and combat the aging effects.

In selecting, avoid the ones with blemishes or those that are over ripe and squishy. Slightly unripe ones are ok. Wash them thoroughly and consume them whatever way you want it. Slightly unripe Greengage fruits can be kept at room temperature to ripen and may be kept up to three days. Chill in the refrigerator for longer storage. It may slow the ripening process, but does not stop it. The best way to store is by making jam from these plums and preserve it in a tightly sealed container.

These plums should be enjoyed in their natural state so they are best eaten as a fruit and are not tasty being pickled or made into chutney. They are good in jam, pies, tarts, fools and sorbets which is compatible with vanilla ice cream or custard.
Like plums, there are no known side effects of this fruit. But it is important to peel them properly before eating as the fruit skin can cause some adverse reactions.

If you want to make greengage jam, you will need unripe fruits to avoid the jam from getting rotten before time. Immature fruits have preservation abilities even when they are cooked. The best time to pick them from the tree if we want to make jam is when the peel of the seed hasn’t formed yet. Make a hole in the greengage and leave it in water for 10 minutes so the bitter taste will disappear. Then, they are ready to be boiled and placed in jars.

The Greengage plum may look deceptive with its green colors that suggest tartness and with such tiny apricot size. But the surprising fact is that the greengage plum’s flesh is tender, flavorful, bursting with juices worthy of syrup when ripe, extremely low acid and candy sweet.  That is why they are also perfectly sweet and honeyed when absolutely ripe. They make a superb jam, with the bonus that they are high in pectin. You don't even need to seed them, as the seeds will rise up to the top of the boiling mass of their own accord, and can be skimmed off easily

And what else? Greengages are great in poaching and freezing for later consumption in the year. If cooking with greengages, crème fraîche or Greek-style yoghurt will enhance their natural sweetness in fools, bavarois, mousses and ice creams. Vanilla and almond complement their flavor in pies, crumbles and sponges.

These fruits are in season in August and September. Greengage fruits found in markets are oftentimes called plums or green plums. Some people think that they are ripe when they turn yellow, and that the green fruits are not matured yet, but this is a wrong notion. So even if the greengage fruits were green they are already fully grown and ready to eat. Nowadays we can find greengage fruits that have a lighter yellow peel in some varieties. Don’t worry they both taste almost the same and the fruit is also packed with nutrients and health benefits!