The aluminum in your deodorant is not a health risk but...

Opinion on the safety of aluminum in cosmetic products

In the study, researchers used different ways to best calculate how much aluminum a person may be exposed to. This was done using information about product type and the product’s known aluminum content as well as how regularly and how much of each product is generally used. They also considered how and where each product is used and how that affects whether any aluminum may enter the body through the skin or mouth. At the end of the study, the SCCS repeated their previous finding that aluminum is safe for use in deodorants and in fact, in cosmetics in general based on current reported use levels –as long as it is used within the specific limits calculated in the study. However, the SCCS reinforced that combined exposure from food, antacids and cosmetic products, which includes everything from deodorant and lipstick to moisturizer, can exceed the safe limits of aluminum.

For further information read the full paper.