Two different functions
Deodorants address unwanted odor. Antiperspirants are intended to reduce sweating. The same product may have both functions only when the formulation and evidence support them.
Define the destination market
Product classification and ingredient requirements depend on where the product will be sold. Include the target market in the first supplier brief.
Write a specific brief
Describe intended use, format, target user and exact claims. Avoid using deodorant and antiperspirant as interchangeable product specifications.