What ingredient is typically the first in a shampoo formula?

In a shampoo formula, the first ingredient listed is typically deionized water. This is because the majority of shampoo formulations consist largely of water, which serves as a solvent that facilitates the blending of other ingredients. Water allows for the effective delivery of active components and contributes to the desired consistency of the product.

Surfactants, while crucial for cleansing and lathering, are usually present in smaller quantities compared to water. Moisturizers and fragrances may also enhance the product but typically follow water in the ingredient list. Thus, deionized water is not only the primary component but also a foundational element that supports the overall effectiveness and stability of the shampoo.