TEA TREE + MINERAL The original, and still its own thing. Tea Tree came first. It predates the zinc formulas, it works differently from all three of them, and we kept making it because a real share of people do better on the classic botanical route than on anything we built afterward. It carries its own name instead of the BioShield badge because the chemistry is different. How it works Sweat comes out close to odorless. Bacteria on your skin break it down and release the acids you can actually smell. Baking soda is what handles those acids here, and it's in this formula on purpose. It's the oldest tool in natural deodorant and it stayed in use because it works. It's also the most common source of natural-deodorant rash. The reason is delivery: baking soda dissolves readily in sweat and releases essentially all of its alkalinity at once. That trade is why Tea Tree is the only one of the four that uses it. Tea tree oil is the botanical the formula is built around, with sage leaf extract alongside it and zinc oxide as the mineral. That's the only zinc in here. Tea Tree doesn't contain the zinc chloride hydroxide that Core, Max, and Sensitive share. What's in it The botanicals Tea tree oil, the lead, and the reason this one has its own name Sage leaf extract, the traditional partner to it The minerals Sodium bicarbonate, neutralizing the acids that make odor Zinc oxide, the mineral this whole category was built on Bamboo silica and tapioca starch, taking up moisture through the day The standard Smooth, invisible glide. No grit, no grease, nothing left on a shirt No aluminum, no alcohol, no propylene glycol Who should skip this one.If a natural deodorant has ever given you a rash, redness, or a burn, buy SENSITIVE instead. Baking soda is the likeliest culprit for whatever happened, and it's in here. If you've used baking soda deodorants for years without trouble, this is the one people have been coming back for since the beginning. Scent Tea Tree FreshSubtle. Clean. Balanced.Crisp tea tree layered with green tea, orange blossom, and soft vanilla. Light and breathable, staying close to the skin. Not sure this is your one? SENSITIVE, $32 · No alkaline active at all, made for sensitive skin. CORE, $22 · The everyday mineral version, no baking soda. MAX, $32 · The biggest formula in the line, made for long days. No baking soda. Compare all four side by side → A classic approach, built properly. 8 years. 68 formulations.Formulated and manufactured in the USA A little goes a long way. One stick runs most people two months or more. See every ingredient, and why it's in here → SWEAT HARD. SMELL ZERO.® From the lab: How Zinc Deodorant Works · Deodorant Ingredients, Explained