Client-specific product portions involve dispensing the exact amount of product needed for a treatment into separate containers for each client, rather than dipping into a communal product jar. This practice helps prevent contamination of the main product supply and ensures that each client receives a fresh, hygienic portion of the product. This is especially important for products like creams, masks, and serums that are applied directly to the skin, reducing the risk of cross-contamination and ensuring a safe treatment environment.