OK, what is the reasoning behind not wanting to use preservatives? They are used in such small amounts, I don't see what all the ruckus is about. They are not harmful when used in the supplier's recommended useage amounts.
There's a lot of negative hype on the internet about parabens, etc, but it's just that - negative hype!
I would much rather not have to worry about anyone - myself, family, friend or customer being exposed to microbials in my products.
What if someone used your unpreserved product & they had a scratch or open wound of some type. The product has no preservative & someone has contaminated it by putting their diry hand into it. Maybe they didin't wash after using the restroom or changing a diaper. Maybe they just had their hand on the lid of the garbage can & didn't wash it. Maybe, they've picked up microbials from some other microbe-infected surface.
From using my own sugar scrubs, I can tell you it's supremely easy to get water into them - & I'm trying to be careful not to!! Someone can forget to put the lid on & it gets moisture from the bathroom as someone takes a hot shower, or water gets dripped in, or that spoon has been sitting out & is exposed to who knows what & you stick it into the jar for the 10th time this month after it's touched your hand as many times transferring whatever microbes are on your skin + whatever was in the air.
There are so many opportunities to contaminate a product, so why in the world take that chance? Ask anyone who's had a staph infection how difficult it is to cure it & how painful it is.
Everyone is so creative with supposed alternatives to preservatives, so why not be as creative at pinpointing the chances of contamination?
I challenge you to find just one, proven alternative to using a preservative that will take care of my number of ways of contaminating a sugar scrub. LOL!