The present invention provides a beverage and a dermatological composition comprising water molecules, the water molecules having oxygen atoms of different isotopes, the beverage being enriched in at least one of the oxygen isotopes, the enrichment being in reference to (i) the amount of that oxygen isotope in the water used to produce the beverage or (ii) the amount of that oxygen isotope in ground water, or (iii) Vienna Standard Mean Ocean Water. The water molecules may be derived from a plant source, such as a juice, a sap or a tree water.