Ideally, a 95% content Nisin A. Handary (Belgium) have informed me that they are no longer producing this product.
Alfa Aesar has it, visit: https://www.alfa.com/en/catalog/J66370/
Carbosynth sells it, visit: http://www.carbosynth.com/carbosynth/website.nsf/(w-productdisplay)/630C3388664429DE80257C460077DB0A
please check this website
http://www.alibaba.com/showroom/nisin.html
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