Some serum-style deodorants include a multi-acid blend (mandelic, lactic and PHA) along with skin-care actives. These ingredients gently acidify and exfoliate the skin, and the product listings state that this can help minimize the appearance of discoloration and ingrown hairs.
Most solid stick deodorants list a net weight of 2.65 ounces, while the serum/gel formats are shown as 1.7 fluid ounces.
These listings and reviews describe the products as odor-control deodorants rather than antiperspirants. They are intended to control odor, but they do not prevent sweating, so perspiration can still occur—especially during heavy activity.
Some gel and serum deodorants include active ingredients such as mandelic acid, lactic acid, polyhydroxy acids (PHA), niacinamide, and xylitol esters.
Many stick formulations advertise clinically proven odor protection for up to 72 hours.