This is particularly relevant for small, frequent doses from large vials
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21 DTNB Colorimetric Method Principle: DTNB reacts with the sulfhydryl group of glutathione to produce yellow-colored 5-thio-2-nitrobenzoic acid, which has a maximum absorption peak at a wavelength of 412 nm, while DTNB has almost no absorption peak above 400 nm
If these conditions are not met, the importation may constitute a criminal offence
Busler J, Grant L, Liao V, Lin A, Rahman S, Mahon P
In the United Kingdom, such medications are labeled POM (Prescription Only Medicines) , versus pharmacy-dispensed medicines (P) or general sale list (GSL) medicines which anyone can buy