Zinc ricinoleate is the zinc salt of ricinoleic acid, a major fatty acid found in castor seed oil.
Zinc ricinoleate doesn't inhibit normal perspiration, and won't interfere with the natural flora of your skin.
It works by absorbing odors caused by bacterial decomposition in the sweat so that they aren't released into the atmosphere.
If you're wondering if zinc ricinoleate contains the toxic compound ricin, the answer is no. Ricin is water soluble and does not dissolve in castor seed oil.