SIKEN substitute collagen vanilla shake from SIKEN. Siken Substitute Plus Collagen Vanilla Bourbon Shake is an ideal meal replacement for weight control. Its delicious flavor of bourbon vanilla, as well as its contribution of 13 vitamins, 15 minerals and collagen make them a delicious way to take care of yourself inside and out. Meal replacement for weight control, with sugars and sweeteners. Siken Substitute with Collagen helps you lose weight or maintain your weight within a low calorie diet.