These are plant-based preparations. They keep well, but they are not indestructible.
The short version
Cool, dry place. Out of direct sunlight. Cap closed. That is genuinely most of it.
Shelf life
24 months from the date of manufacture, which is printed on every pack. Do not use a bottle past that date even if it looks fine.
If a bottle has been left in the heat
A few hours in a warm room is not a problem. A day on a sunny windowsill or in a parked car is — heat and light degrade plant extracts. If the colour or smell has changed noticeably, do not use it. Message us and we will help.