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Description
The presence of Zinc Sulfate increases the chance of burning, stinging, or mild swelling at the site

Br Dent J 2005

[DOI] [PubMed] [Google Scholar] 3.Raj SR, Guzman JC, Harvey P, et al

So it is best that you store it properly by placing it in the fridge

Supplied for in-vitro laboratory research use only (RUO)
Furthermore, there is an interesting notation provided by Lee and Burgess [261]
