Not sure yet [SEP] i am new to the skincare world and using preservatives.I have tried luicdal,and optiphen plus and both seemed to work just fine,This one I smell a chemical smell,I made a batch of hyaluronic acid with vit C,using the same measurements I always used but felt a sting on my face.I wasn't sure if it was the citric acid or the germall plus.also I made a skin toner with tea and rose hydrosol, that seemed fine.I find this one kinda chemicallish and syrupy in texture,so I am a bit more careful in what I use it for.I would be more apt to use it on a body product and maybe not so much face or eye area because i am not quite sure if it is the product that seems a bit strong,or if it is becuase I am a noob and not sure yet.I will continue to use this and update if I notice a difference.I do feel safer with this one, but so far I like the optithen plus best.I forgot the reason why this was recommended over the other 2,but i will keep figuring out what formulations work best for what i am doing.