Why do you need to check the authenticity of Mead Johnson? Mead Johnson is a well-known brand that sells highly popular milk powder and other infant formulas. However, there are also some fake and inferior Mead Johnson products on the market. Therefore, knowing how to check the authenticity of Mead Johnson is of great significance to ensure the safety of infant and young child food and the interests of consumers. Step 1: Check the product packaging. When purchasing Mead Johnson products, you must first check the product packaging.