As a subject matter expert in the field of chemistry and personal care products, I can provide insights into the use of baking soda in deodorants.

Baking soda, or sodium bicarbonate, is often cited as a potential irritant when used in deodorants. The primary reason for this concern is that baking soda can be abrasive to the skin, particularly for individuals with sensitive skin. When applied, it can cause a mild chemical burn or irritation, which may lead to redness, itching, or discomfort.

Additionally, baking soda is known for its alkalizing properties. The skin's natural pH is slightly acidic, and altering this balance can potentially disrupt the skin's natural barrier, making it more susceptible to infections or irritations.

Moreover, some studies suggest that the use of baking soda in deodorants may not be as effective as other ingredients in combating odor because it does not neutralize the bacteria that cause body odor as effectively as other antimicrobial agents.

However, it's important to note that not everyone experiences negative effects from baking soda in deodorants. Some people may find that it works well for them without causing any irritation. The suitability of baking soda in deodorants can vary greatly from person to person.

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Baking soda has earned a bad reputation because it gets blamed for causing the rash. And it CAN cause a rash because of its alkaline pH IF it's used at too high of a concentration. ... However, an expertly formulated deodorant will not cause a baking soda reaction when used at a lower concentration.read more >>