Coconuts don't need preservation. This kind of coconut green sold in the supermarket is peeled and tender. If the fiber in the ripe coconut is too old to be cut, you can use it safely, but you must drink it as soon as it is opened, otherwise it will easily deteriorate and affect the taste.

Extended data:

The fruit cycle of coconut green is short, and the coconut juice is sweet and antipyretic. Coconut greens are the freshest together with freshly picked fruits, and the pulp tastes the most milky. The pulp is generally thinner and thicker, which is more suitable for coconut paste and coconut chicken soup than old coconut (hairy coconut).

It is said that the taste of coconut juice changes after it leaves the coconut shell: the coconut juice poured out in the morning is sweeter and lighter in the afternoon. What is even more mysterious is what Southeast Asians say: Coconut juice is cool and moist when the sun is not out in the morning, and can cure various diseases such as lung heat. When the sun comes out, after six or seven in the morning, coconut milk has no such effect. This is unverified.

Baidu encyclopedia-coconut green