Marshmallow Flavour Concentrate by Global Hubb is for use in DIY mixing, and will require other ingredients such as PG and VG to use correctly.
Flavour concentrates are designed to be added to a base mix of VG and PG, infusing a particular flavour into the blend. Users can add in as little or as much flavouring as they wish, allowing for either a strong or weak flavour blend
This is a juice that needs support. On it's own it needs high concentrate to get any flavour through, and even then it just lacks. The sweetness isn't there, and the flavour is really weak and too dark. However i feel that with a supporting flavour like strawberry this may work nicely. Yet to try though as was testing single mixes with it. Throat hit becomes a tad harsh when the flavour is increased also sadly. I'm suspecting that the marshmallow needs to be the dominant flavour in the mix still.