Magnesium and zinc sit side by side on natural deodorant labels like they're doing the same job. They're not even in the same line of work. In the magnesium vs zinc deodorant question, one of them stops the smell and the other makes sure your skin doesn't stage a revolt while it happens. Here's who does what.
What zinc does
Zinc is the odor worker. In a zinc-based system, zinc ions act on the actual source of body odor — they help convert the smelly molecules bacteria produce into larger, non-volatile compounds that can't reach your nose, and they reduce the bacterial activity that creates those molecules in the first place. That's what "eliminates odor at the source" means mechanically: zinc targets the odor process, rather than masking the result or blocking sweat. It's the core of BioShield™.
What magnesium does
Magnesium plays a different, supporting role. Its main contributions are around skin compatibility and helping maintain the conditions the rest of the system works best in. It's part of what lets a formula stay effective while remaining gentle, which matters when you're applying something daily to a high-friction area. Magnesium is not the primary odor active — it supports the zinc system rather than replacing it.
How they work together in practice
This is exactly why Zaffré's two BioShield™ formulas differ:
- MAX is the magnesium-enhanced BioShield™ formula, engineered for heavy sweat and long days. The magnesium enhancement is part of what tunes it for higher-demand conditions.
- SENSITIVE is the magnesium-free, fragrance-free BioShield™ formula, engineered for reactive skin that needs the simplest, gentlest path to odor control.
Both run the same zinc-based core that eliminates odor at the source. The magnesium is the variable that distinguishes them.
Which one fits you
Zinc is what stops the odor. Magnesium is the dial that tunes the formula to your skin and your sweat. Same engineering, two settings.