Rabee, I've been experimenting with the copper minerals azurite and malachite. When mixed with bicarb of soda and embedded in a breathable fiber insole, it's been the most effective thing I've tried so far with my foot odor. I have made few hundred of these insoles so far and would like to send some to you (no charge) to test, if you message me. Each insole has a mechanical life of several months and can be washed multiple times without losing any copper. (The baking soda DOES wash out, but can be replaced by a quick soak after washing.)