I reached out to two online suppliers who work with small businesses, and both supplies told me about a product called "PhytoCide Elderberry OS" by Active Micro Technologies. When I pushed back with one of the suppliers and said its an extract, not a preservative, she said I was wrong because its considered antimicrobial. I'm curious what actual chemists think - is elderberry antimicrobial?
Here's a little bit info on why I'm looking for a preservative. I'm launching a new line of lip products with open jar packaging. My concern is from the consumers' side. Since I have no control how clean the consumers fingers will be before applying product, I wanted to be on the safe side.