Zinc oxide is the metal zinc that has been oxidized. The chemical formula is ZnO, 1 zinc atom and 1 oxygen atom held together by an ionic bond. Zinc oxide does occur in nature as the mineral zincite, but it is quite rare and commercially unavailable.
I have done a few stool samples in my time and have always just stored them in the fridge, until the next day to take them into the docs. Good luck hun I hope they get it sorted.
I'm just so confused about how long formula can be kept after use and how long those cartons realistically can be open for. Cow & Gate says 24 hours in the fridge, whereas Aptamil says 2 hours in the fridge. Cow & Gate gave LO horrible diarrhoea so I want to stick with Aptamil.