All the remedies dispensed by Elements of Health will have a use by date on them and this is a legal requirement in Australia.
With pilules this is determined by the batch which comes from the manufacturer.
Drops do not generally last long-term due to things like contamination of the dropper by it touching the mouth and often the rubber dropper has a tendency to perish and permeate the remedy over time.
Sometimes contaminated remedies will have what we call “floaters” which is a mould that develops. It’s always good to check old bottles for this.
If you have a lot of remedies with no use by dates, particularly drops which are likely to go over within a couple of years, we would recommend you replace them to be sure they are going to work when you need them to.