How Zinc Stops Body Odor
Why Sweat Smells in the First Place
Here is the part most brands skip: fresh sweat is nearly odorless. The smell comes later, when skin bacteria, mainly Staphylococcus hominis and Corynebacterium, feed on the proteins and fats in sweat and release the sulfur and acid compounds we recognize as body odor.
That means there are only a few real ways to fight odor. You can block sweat entirely with aluminum, the antiperspirant route. You can raise your skin's pH with baking soda until bacteria struggle, the classic natural-deodorant route, and also the most common cause of underarm rash. Or you can go after the odor-forming step itself, using a precision zinc-based active that traps and neutralizes odor compounds directly, paired with a mild, skin-aligned acid ester that works with your skin's own pH rather than against it. That is the path BioShield™ takes: zinc leads, every supporting ingredient earns its place, and nothing is there to mask a smell instead of stopping it.
How Zinc Neutralizes Odor
Zinc-based actives are the backbone of BioShield™. They work by trapping and neutralizing the odor compounds bacteria produce, an adsorption-led mechanism rather than an attempt to overhaul your entire underarm's chemistry. That backbone runs through every BioShield formula. Layered onto it, a mild, skin-aligned acid ester lends additional, self-renewing support without picking a fight with your skin's natural pH, and in Max, an added mineral buffer brings extra pH-based control for heavy sweat.
The advantage: the zinc backbone works with your body's natural cooling process instead of against it. You still sweat, your skin still regulates temperature, but the odor pathway is interrupted. Because the magnesium-free Sensitive formula skips baking soda, added acids beyond that mild ester, and alcohol, the usual sources of natural-deodorant burn, it is the formula that carries our 0% irritation result (RIPT patch testing, 57 subjects) and post-shave safety.
Different BioShield formulas are built for different bodies, not different tiers of real science. Here is how Max and Sensitive split.
Detect. Disrupt. Defend.
BioShield™ is a multi-pathway system built from advanced ingredient architecture, working in three stages:
What Makes BioShield™ Different
One Standard. Three Formulas.
BioShield™ powers two of them, each engineered for a different kind of body, not a different level of performance. Both eliminate odor at the source. Both hold up all day. The third, Tea Tree, takes its own approach, below.
A Different Approach: Tea Tree + Mineral
Not everyone's skin wants the same system. For the roughly 15 to 20% of people whose skin prefers botanical actives, Zaffré® offers Tea Tree + Mineral, the original Zaffré® formula, built on mineral actives and tea tree botanical science.
It follows the same engineering philosophy as BioShield™, no aluminum, no fragrance as a crutch, no ingredient without a function, but it works through a different primary mechanism. Where BioShield™ leads with a precision zinc-based active, Tea Tree + Mineral leads with tea tree botanical actives and mineral inputs, using reduced baking soda (60% less than standard competitors) and bamboo silica for moisture control. It neutralizes odor at the source on its own terms. Same standard, different chemistry, which is why Tea Tree carries its own name rather than the BioShield™ badge. Shop Tea Tree →
Common Questions
Yes. Zinc-based actives trap and neutralize the odor compounds that skin bacteria produce when they break down sweat. Rather than masking smell or blocking sweat, they interrupt the chemical step that creates odor in the first place, which is why BioShield™ holds up through heat and long days without aluminum or baking soda.
No. Antiperspirants use aluminum to block sweat glands. BioShield™ lets you sweat normally and instead eliminates odor at the source, so your body's natural cooling still works.
BioShield™ contains no baking soda and no alcohol, two of the usual culprits behind natural-deodorant rash. The Sensitive formula goes further: it is also magnesium-free, and it is the version that carries our 0% irritation result (RIPT patch testing, 57 subjects) and post-shave safety. Max adds a mineral buffer for extra odor and pH control on heavy-sweat days, formulated for performance rather than tested to that same irritation benchmark, so if your skin runs reactive, start with Sensitive.
Both run on the same zinc-based BioShield™ backbone. Max is magnesium-enhanced for heavy sweat and long days. Sensitive is magnesium-free for reactive skin. All-Day Protection either way, calibrated for different bodies.
Keep Reading
Deodorant Without Baking Soda: Why It Matters · Magnesium vs Zinc Deodorant · Best Natural Deodorant for Heavy Sweating · Why Does My Deodorant Burn?
8 years in development · 68 formulation iterations · 0% irritation (RIPT, 57 subjects)
High-Density Formula · Premium 3.2oz Supply
More product. Fewer swipes. Longer between replacements.
Formulated and Manufactured in the USA
Our Ingredients
Tapioca Starch, Sodium Bicarbonate, Vitis Vinifera (Grape) Seed Oil, Carthamus Tinctorius (Safflower) Seed Oil, Prunus Armeniaca (Apricot) Kernel Oil, Triethyl Citrate Natural, Carthamus Tinctorius (Safflower) Seed Oil, Stearyl Behenate, Jojoba Esters, Bambusa arundinacea stem powder, Oryza Sativa (Rice) Powder, Euphorbia Cerifera (Candelilla) Wax, Copernicia Cerifera (Carnauba) Wax, Lauryl Laurate, Amyris Balsamifera Bark Oil, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Natural Fragrance, Helianthus Annuus (Sunflower) Seed Wax, Zinc Oxide, Oryza Sativa (Rice) Bran Wax, Salvia Officinalis (Sage) Leaf Extract, Titanium Dioxide
Tapioca Starch, Vitis Vinifera (Grape) Seed Oil, Carthamus Tinctorius (Safflower) Seed Oil, Prunus Armeniaca (Apricot) Kernel Oil, Triethyl Citrate Natural, Zinc Chloride Hydroxide, Jojoba Esters, Stearyl Behenate, C13-16 Isoalkane , Bambusa arundinacea stem powder, Oryza Sativa (Rice) Powder, Cellulose, Euphorbia Cerifera (Candelilla) Wax, Copernicia Cerifera (Carnauba) Wax, Simmondsia chinensis (Jojoba) Seed Oil, Lauryl Laurate, Methylheptylglycerin, Heptyl Undecylenate, Amyris Balsamifera Bark Oil, Zinc Oxide, Oryza Sativa (Rice) Bran Wax, Bisabolol, Helianthus Annuus (Sunflower) Seed Wax, Titanium Dioxide
Tapioca Starch, Vitis Vinifera (Grape) Seed Oil, Carthamus Tinctorius (Safflower) Seed Oil, Prunus Armeniaca (Apricot) Kernel Oil, Triethyl Citrate Natural, Zinc Chloride Hydroxide, Jojoba Esters, Stearyl Behenate, C13-16 Isoalkane , Bambusa arundinacea stem powder, Oryza Sativa (Rice) Powder, Cellulose, Euphorbia Cerifera (Candelilla) Wax, Copernicia Cerifera (Carnauba) Wax, Magnesium hydroxide, Simmondsia chinensis (Jojoba) Seed Oil, Lauryl Laurate, Methylheptylglycerin, Heptyl Undecylenate, Amyris Balsamifera Bark Oil, Zinc Oxide, Bisabolol, Helianthus Annuus (Sunflower) Seed Wax, Oryza Sativa (Rice) Bran Wax, Titanium Dioxide
If Scented
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Tapioca Starch, Vitis Vinifera (Grape) Seed Oil, Carthamus Tinctorius (Safflower) Seed Oil, Prunus Armeniaca (Apricot) Kernel Oil, Triethyl Citrate Natural, Zinc Chloride Hydroxide, Jojoba Esters, Stearyl Behenate, C13-16 Isoalkane , Bambusa arundinacea stem powder, Oryza Sativa (Rice) Powder, Cellulose, Euphorbia Cerifera (Candelilla) Wax, Copernicia Cerifera (Carnauba) Wax, Magnesium hydroxide, Lauryl Laurate, Natural Fragrance, Methylheptylglycerin, Heptyl Undecylenate, Amyris Balsamifera Bark Oil, Simmondsia chinensis (Jojoba) Seed Oil, Zinc Oxide, Bisabolol, Helianthus Annuus (Sunflower) Seed Wax, Oryza Sativa (Rice) Bran Wax, Titanium Dioxide