Review of Vanilla Custard Flavor-Cap:

I started DIY in November 2015, I bought all of my flavors in bottles no bigger than 10ml to start until I figured out which ones I'd end up using the most. Eight months later, this is among the first few flavors I use often enough to justify picking up a 4oz. bottle.

You cannot ask for a richer, creamier, more satisfying custard base than this one. It's sublime. Steep a minimum of one week to get an idea of its potential, but it really becomes a thing of beauty after a month or more. 

An absolutely essential ingredient by any standard.