The liquid capsules are made out of gelatin. This is soluble in water, so will dissolve in your mouth or in your stomach.
The liquid inside will contain little to no water so that it can’t dissolve the gelatin from the inside.
A similar principle are the liquid tablet’s you put into your washing machine to wash clothes. These are made of a water soluble ‘plastic’ but the liquid inside has very low water content. If you leave them in a humid environment for too long, they will eventually fail.
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