Nicotine Base by Cotswold Vapour
This product is designed to be added to Short Fill eliquids which are 0mg, but can be used on its own if you are wanting unflavoured eliquid at a high strength.
All Short Fill eliquids come in an oversized bottle, allowing you to add a nicotine shot to it easily. Just add it to the Short Fill bottle and give it a good shake.
By adding a 10ml nicotine shot at 18mg to a 50ml RTM, produces 60ml of eliquid at 3mg in strength as the final product.