Polymers are used in wetting agents. Polymers are compounds which contain carbon and in the science of chemistry, carbon compounds are called organic compounds. They are studied in organic chemistry. This is different from organic gardening, and I am unclear as to whether this kind of product has a place in an organic program.
Only the manufacturers can say what the inert ingredients are. Farmyard manure, compost and similar products will also improve the moisture holding property of a soil but they will probably be more expensive and certainly a little more work.

The most commercially used organic wetting agent I know of is yucca juice, but adding a little sugar works too.

Just plain sugar, or mix it with the yucca juice?

Found this:

Here is a link that might be useful: Zeba wetting agent...

What are you trying to do? When I see wetting agent, I'm automatically thinking of a material that will allow moisture to cling to the waxy or otherwise hydrophobic surface of some plants. Do you want something to keep the moisture in your sand? Organic material is what you want for that. The organic matter you want comes from roots and dead roots from grass. Just grow grass, fertilize (organic only), and mow it and the water holding capacity will improve.

The 'zeba' site describes the product as polymer based.