What is the best source of information for deciding whether a product meets your needs?

The best source of information for deciding whether a product meets your needs would be to check the product's labels as it lists all the contents it has and what you will get from consuming it, therefore checking the labels on products is the best way as you can see right away if it has what you need.

The best source of information in deciding whether a product meets your needs is to check the content located in the package of the product. It has the content which makes you assess and evaluate whether that certain product has what you need.