Hi there,
I make my own juice from concentrate and I find that i am too wanting sweeter flavours however I do like the tobacco flavours just sweeter so I buy sweetener and it is just sucralose, this is the description of it from Naked Vapour
Used to sweeten other flavours.
Sweetener - I mixed this at 10% with VG and have added one drop of that mixture to other flavors with great success!
This adds a gentle level of sweetness to other flavors, completing them, and also provides multiple points of sweetness on the tongue. It tastes almost like rock candy.
Note: This uses sucralose.
I don't find that it alters the flavour at all other than making it sweeter, I guess like adding a spoon of sugar to a cup of tea.
Hope this helps. Oh just a note, you may find that your taste buds just require a little more sweet than others and I always err on the side of caution when making flavours for others with how sweet I make them as you can add more but not take it out, and I'd guess the vendor has the same thought.