There is a bottle of Qingyang 750ML shampoo, which has been left for some time. I don't remember how long it has been, and I can't find the shelf life and production date. There are many more in it.

The production date and shelf life of Qingyang 750ML shampoo can be found on the packaging box or bottle. Generally speaking, the shelf life of shampoo is three years, depending on the production date and the preservation after opening the bottle.

If you can't find the shelf life and production date, you can try the following methods:

1. Recall the place and time of purchase, and contact merchants or manufacturers for information such as production date and shelf life.

2. Observe the appearance and smell of shampoo. If there is odor, discoloration or deterioration, it may have expired or been improperly stored.

3. If there is no odor or deterioration, you can try to use shampoo, but you need to pay attention to the effect and reaction after use. If there are adverse reactions such as allergies, it is recommended to stop using them.

Please note that in order to ensure the safety and effectiveness of use, it is recommended to use Qingyang 750ML shampoo within the shelf life as much as possible, and pay attention to the correct storage and use.