mixing colloidal silver water with other properties?

I like to make my own homemade face and body lotions to avoid preservatives and harmful chemicals in over the counter products. however I have a problem with mold growing very fast in them if I don't keep them in the refrigerator. So i was thinking of adding some Colloidal Silver water however not sure how it would effect the silver proteins and the other key properties. from the other ingredients in the lotion there are vitamins such as C, D, B's, and essential oils such as (rosehips, ylang ylang and grape-seed extract)
I would be adding the silver water (250 ppm) last to the mixture after the lotion has settled and cooled.
Does anyone have any experience or knowledge of using Colloidal Silver water and other elements together? Thank you for your help in advance =)