The search results provide information on how to check the details of cosmetic products, including their manufacturing date, shelf life, ingredients, and potential negative effects. Here are some key takeaways:

• CheckFresh and CheckCosmetic are websites that allow you to find out the manufacturing date of your cosmetics and perfumes from the batch code. You can also check whether your cosmetics are fresh and usable. The batch code is printed or stamped on the bottom of the product package.

• Think Dirty and SkinSort are apps that offer ingredient checkers for skincare, hair care, and makeup products. You can scan the product barcode or type the product name in the search bar to find the products you use or are interested in using. The apps provide information on the products ingredients, safety and toxicity, effectiveness, user experiences, risk level, potential allergens, and ingredients that may aggravate acne.

• Think Dirty also allows you to personalize your ingredient preferences and receive ingredient alerts if any flagged ingredients are found in the products you viewed. You can also submit a products barcode and ingredient list to the apps database if its missing.

• SkinSort offers a copy and paste analyzer and a photo analyzer to analyze any product for a science-backed breakdown of its ingredients. The app independently verifies the science behind ingredients, and its claims are backed by peer-reviewed research.

Overall, these resources can help you make informed decisions about the products you use and avoid potential negative effects from harmful ingredients.